aboutsummaryrefslogtreecommitdiffstats
path: root/lib/stdlib/doc/src/notes.xml
blob: befbabe8de7100ff693c1d3d60d47056b49bd02c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>2004</year><year>2018</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
 
          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.

    </legalnotice>

    <title>STDLIB Release Notes</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev></rev>
    <file>notes.xml</file>
  </header>
  <p>This document describes the changes made to the STDLIB application.</p>

<section><title>STDLIB 3.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The specs of <c>filename:basedir/2,3</c> are
	    corrected.</p>
          <p>
	    Own Id: OTP-15252 Aux Id: ERL-667 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Let <c>dets:open_file()</c> exit with a <c>badarg</c>
	    message if given a raw file name (a binary). </p>
          <p>
	    Own Id: OTP-15253 Aux Id: OTP-13229, ERL-55 </p>
        </item>
        <item>
	    <p> The <c>Format</c> argument of the formatting
	    functions in modules <c>io</c> and <c>io_lib</c> is
	    accepted even if it is, for example, a list of binaries.
	    This is how it used to be before Erlang/OTP 21.0. </p>
          <p>
	    Own Id: OTP-15304</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.5.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Fix a bug that could cause a crash when formatting a
	    list of non-characters using the control sequences
	    <c>p</c> or <c>P</c> and limiting the output with the
	    option <c>chars_limit</c>. </p>
          <p>
	    Own Id: OTP-15159</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p><c>gen_statem</c> improvements.</p> <p> When using an
	    exception that is valid but not allowed in a state enter
	    call, the reason has been changed from
	    <c>{bad_action_from_state_function,Action}</c> to
	    <c>{bad_state_enter_action_from_state_function,Action}</c>.
	    </p><p> Timer parsing has been improved. Many erroneous
	    timeout tuples was not handled correctly. </p><p> The
	    documentation has been updated, in particular the User's
	    Guide and the pointer to it from the Reference Manual is
	    much more obvious. </p>
          <p>
	    Own Id: OTP-14015</p>
        </item>
        <item>
          <p>
	    The type specifications for <c>file:posix/0</c> and
	    <c>inet:posix/0</c> have been updated according to which
	    errors file and socket operations should be able to
	    return.</p>
          <p>
	    Own Id: OTP-14019 Aux Id: ERL-550 </p>
        </item>
        <item>
	    <p> File operations used to accept <seealso
	    marker="kernel:file#type-name_all">filenames</seealso>
	    containing null characters (integer value zero). This
	    caused the name to be truncated and in some cases
	    arguments to primitive operations to be mixed up.
	    Filenames containing null characters inside the filename
	    are now <em>rejected</em> and will cause primitive file
	    operations to fail. </p> <p> Also environment variable
	    operations used to accept <seealso
	    marker="kernel:os#type-env_var_name">names</seealso> and
	    <seealso
	    marker="kernel:os#type-env_var_value">values</seealso> of
	    environment variables containing null characters (integer
	    value zero). This caused operations to silently produce
	    erroneous results. Environment variable names and values
	    containing null characters inside the name or value are
	    now <em>rejected</em> and will cause environment variable
	    operations to fail. </p> <p>Primitive environment
	    variable operations also used to accept the <c>$=</c>
	    character in environment variable names causing various
	    problems. <c>$=</c> characters in environment variable
	    names are now also <em>rejected</em>. </p> <p>Also
	    <seealso
	    marker="kernel:os#cmd/1"><c>os:cmd/1</c></seealso> now
	    reject null characters inside its <seealso
	    marker="kernel:os#type-os_command">command</seealso>.
	    </p> <p><seealso
	    marker="erts:erlang#open_port/2"><c>erlang:open_port/2</c></seealso>
	    will also reject null characters inside the port name
	    from now on.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14543 Aux Id: ERL-370 </p>
        </item>
        <item>
	    <p> Make <c>io_lib:unscan_format/1</c> work with pad char
	    and default precision. </p>
          <p>
	    Own Id: OTP-14958 Aux Id: PR-1735 </p>
        </item>
        <item>
	    <p> The control sequence modifiers <c>t</c> and <c>l</c>
	    can be used together in the same control sequence which
	    makes it possible to have Unicode atoms and no detection
	    of printable character lists at the same time. </p>
          <p>
	    Own Id: OTP-14971 Aux Id: PR-1743 </p>
        </item>
        <item>
	    <p> Fix a bug in the Erlang code linter: the check of
	    guard expressions no longer returns <c>false</c> if the
	    map syntax is used. The bug affected the Erlang shell,
	    the Debugger, and other modules evaluating abstract code.
	    </p>
          <p>
	    Own Id: OTP-15035 Aux Id: ERL-613 </p>
        </item>
        <item>
          <p>
	    A sys debug fun of type {Fun,State} should not be
	    possible to install twice. This was, however, possible if
	    the current State was 'undefined', which was mistaken for
	    non-existing fun. This has been corrected.</p>
          <p>
	    Own Id: OTP-15049</p>
        </item>
        <item>
          <p>
	    Fix <c>io:putchars/2</c> stacktrace rewriting at errors
	    to point to a valid function.</p>
          <p>
	    Own Id: OTP-15101</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The <c>gen_server</c> has gotten a new callback
	    <c>handle_continue/2</c> for check pointing the state.
	    This is useful at least when implementing behaviours on
	    top of <c>gen_server</c> and for some start up scenarios.</p>
          <p>
	    Own Id: OTP-13019 Aux Id: PR-1490 </p>
        </item>
        <item>
	    <p> The semantics of timeout parameter
	    <c>{clean_timeout,infinity}</c> to
	    <c>gen_statem:call/3</c> has been changed to use a proxy
	    process for the call. With this change
	    <c>clean_timeout</c> implicates a proxy process with no
	    exceptions. This may be a hard to observe
	    incompatibility: in the presence of network problems a
	    late reply could arrive in the caller's message queue
	    when catching errors. That will not happen after this
	    correction. </p><p> The semantics of timeout parameter
	    <c>infinity</c> has not been changed. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-13073 Aux Id: PR-1595 </p>
        </item>
        <item>
	    <p>A new logging API is added to Erlang/OTP, see the
	    <seealso
	    marker="kernel:logger"><c>logger(3)</c></seealso> manual
	    page, and section <seealso
	    marker="kernel:logger_chapter">Logging</seealso> in the
	    Kernel User's Guide.</p>
	    <p>Calls to <c>error_logger</c> are automatically
	    redirected to the new API, and legacy error logger event
	    handlers can still be used. It is, however, recommended
	    to use the Logger API directly when writing new code.</p>
	    <p>Notice the following potential incompatibilities:</p>
	    <list> <item><p>Kernel configuration parameters
	    <c>error_logger</c> still works, but is overruled if the
	    default handler's output destination is configured with
	    Kernel configuration parameter <c>logger</c>.</p> <p>In
	    general, parameters for configuring error logger are
	    overwritten by new parameters for configuring
	    Logger.</p></item> <item><p>The concept of SASL error
	    logging is deprecated, meaning that by default the SASL
	    application does not affect which log events are
	    logged.</p> <p>By default, supervisor reports and crash
	    reports are logged by the default Logger handler started
	    by Kernel, and end up at the same destination (terminal
	    or file) as other standard log event from Erlang/OTP.</p>
	    <p>Progress reports are not logged by default, but can be
	    enabled by setting the primary log level to info, for
	    example with the Kernel configuration parameter
	    <c>logger_level</c>.</p> <p>To obtain backwards
	    compatibility with the SASL error logging functionality
	    from earlier releases, set Kernel configuration parameter
	    <c>logger_sasl_compatible</c> to <c>true</c>. This
	    prevents the default Logger handler from logging any
	    supervisor-, crash-, or progress reports. Instead, SASL
	    adds a separate Logger handler during application start,
	    which takes care of these log events. The SASL
	    configuration parameters <c>sasl_error_logger</c> and
	    <c>sasl_errlog_type</c> specify the destination (terminal
	    or file) and severity level to log for these
	    events.</p></item></list>
          <p>
	    Since Logger is new in Erlang/OTP 21.0, we do reserve the
	    right to introduce changes to the Logger API and
	    functionality in patches following this release. These
	    changes might or might not be backwards compatible with
	    the initial version.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-13295</p>
        </item>
        <item>
	    <p> Add functions
	    <c>calendar:system_time_to_local_time/2</c> and
	    <c>calendar:system_time_to_universal_time/2</c>. </p>
          <p>
	    Own Id: OTP-13413</p>
        </item>
        <item>
	    <p> Functions <c>rand:uniform_real/0</c> and
	    <c>rand:uniform_real_s/1</c> have been added. They
	    produce uniformly distributed numbers in the range <c>0.0
	    =&lt; X &lt; 1.0</c> that are as close to random real
	    numbers as Normalized IEEE 754 Double Precision allows.
	    Because the random real number exactly <c>0.0</c> is
	    infinitely improbable they will never return exactly
	    <c>0.0</c>. </p><p> These properties are useful when you
	    need to call for example <c>math:log(X)</c> or <c>1 /
	    X</c> on a random value <c>X</c>, since that will never
	    fail with a number from these new functions. </p>
          <p>
	    Own Id: OTP-13764 Aux Id: PR-1574 </p>
        </item>
        <item>
          <p>
	    Added maps:iterator/0 and maps:next/1 to be used for
	    iterating over the key-value associations in a map.</p>
          <p>
	    Own Id: OTP-14012</p>
        </item>
        <item>
	    <p>Changed the default behaviour of <c>.erlang</c>
	    loading: <c>.erlang</c> is no longer loaded from the
	    current directory. <c>c:erlangrc(PathList)</c> can be
	    used to search and load an <c>.erlang</c> file from user
	    specified directories.</p> <p><c>escript</c>,
	    <c>erlc</c>, <c>dialyzer</c> and <c>typer</c> no longer
	    load an <c>.erlang</c> at all.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14439</p>
        </item>
        <item>
          <p>
	    Added new uri_string module to stdlib for handling URIs
	    (RFC 3986).</p>
          <p>
	    Own Id: OTP-14496</p>
        </item>
        <item>
          <p>
	    Update Unicode specification to version 10.0.</p>
          <p>
	    Own Id: OTP-14503</p>
        </item>
        <item>
	    <p><c>filelib:wildcard()</c> now allows characters with a
	    special meaning to be escaped using backslashes.</p>
	    <p>This is an incompatible change, but note that the use
	    of backslashes in wildcards would already work
	    differently on Windows and Unix. Existing calls to
	    <c>filelib:wildcard()</c> needs to be updated. On
	    Windows, directory separators must always be written as a
	    slash.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14577</p>
        </item>
        <item>
          <p>
	    The supervisor now stores its child specifications in a
	    map instead of a list. This causes a significant
	    improvement when starting many children under a
	    non-simple_one_for_one supervisor.</p>
          <p>
	    Own Id: OTP-14586</p>
        </item>
        <item>
	    <p> The <c>base64</c> module is optimized. </p> <p> Note
	    that the functions <c>encode/1</c>, <c>decode/1</c>, and
	    <c>mime_decode/1</c> fail unless called with an argument
	    of the documented type. They used to accept any
	    <c>iodata()</c>. </p>
          <p>
	    Own Id: OTP-14624 Aux Id: PR-1565 </p>
        </item>
        <item>
	    <p> Add function <c>lists:search/2</c>. </p>
          <p>
	    Own Id: OTP-14675 Aux Id: PR-102 </p>
        </item>
        <item>
          <p>
	    uri_string module extended with functions for handling
	    application/x-www-form-urlencoded query strings based on
	    the HTML5 specification.</p>
          <p>
	    Own Id: OTP-14747</p>
        </item>
        <item>
	    <p> Add functions
	    <c>calendar:rfc3339_to_system_time/1,2</c> and
	    <c>calendar:system_time_to_rfc3339/1,2</c>. </p>
          <p>
	    Own Id: OTP-14764</p>
        </item>
        <item>
	    <p> The stack traces returned by the functions of the
	    <c>erl_eval</c> module more accurately reflect where the
	    exception occurred. </p>
          <p>
	    Own Id: OTP-14826 Aux Id: PR 1540 </p>
        </item>
        <item>
	    <p> Add options <c>atime</c>, <c>mtime</c>, <c>ctime</c>,
	    <c>uid</c>, and <c>gid</c> to the <c>erl_tar:add/3,4</c>
	    functions. </p>
          <p>
	    Own Id: OTP-14834 Aux Id: PR 1608 </p>
        </item>
        <item>
	    <p>Added <c>ets:whereis/1</c> for retrieving the table
	    identifier of a named table.</p>
          <p>
	    Own Id: OTP-14884</p>
        </item>
        <item>
          <p>
	    Improved URI normalization functions in the uri_string
	    module.</p>
          <p>
	    Own Id: OTP-14910</p>
        </item>
        <item>
	    <p> The new functions <c>io_lib:fwrite/3</c> and
	    <c>io_lib:format/3</c> take a third argument, an option
	    list. The only option is <c>chars_limit</c>, which is
	    used for limiting the number of returned characters. The
	    limit is soft, which means that the number of returned
	    characters exceeds the limit with at most a smallish
	    amount. If the limit is set, the functions
	    <c>format/3</c> and <c>fwrite/3</c> try to distribute the
	    number of characters evenly over the control sequences
	    <c>pPswW</c>. Furthermore, the control sequences
	    <c>pPwP</c> try to distribute the number of characters
	    evenly over substructures. </p> <p> A modification of the
	    control sequences <c>pPwW</c> is that even if there is no
	    limit on the number of returned characters, all
	    associations of a map are printed to the same depth. The
	    aim is to give a more consistent output as the order of
	    map keys is not defined. As before, if the depth is less
	    than the number of associations of a map, the selection
	    of associations to print is arbitrary. </p>
          <p>
	    Own Id: OTP-14983</p>
        </item>
        <item>
	    <p> Add functions <c>ordsets:is_empty/1</c> and
	    <c>sets:is_empty/1</c>. </p>
          <p>
	    Own Id: OTP-14996 Aux Id: ERL-557, PR-1703 </p>
        </item>
        <item>
          <p>
	    Improve performance of <c>string:uppercase/1</c>,
	    <c>string:lowercase/1</c> and <c>string:casefold/1</c>
	    when handling ASCII characters.</p>
          <p>
	    Own Id: OTP-14998</p>
        </item>
        <item>
	    <p>External funs with literal values for module, name,
	    and arity (e.g. <c>erlang:abs/1</c>) are now treated as
	    literals. That means more efficient code that produces
	    less garbage on the heap.</p>
          <p>
	    Own Id: OTP-15003</p>
        </item>
        <item>
          <p>
	    sys:statistics(Pid,get) did not report 'out' messages
	    from gen_server. This is now corrected.</p>
          <p>
	    Own Id: OTP-15047</p>
        </item>
        <item>
          <p>
	    A sys debug function can now have the format
	    {Id,Fun,State} in addition to the old {Fun,State}. This
	    allows installing multiple instances of a debug fun.</p>
          <p>
	    Own Id: OTP-15048</p>
        </item>
        <item>
	    <p> The <c>lib</c> module is removed:</p> <list
	    type="bulleted"> <item><c>lib:error_message/2</c> is
	    removed.</item> <item><c>lib:flush_receive/0</c> is
	    removed.</item> <item><c>lib:nonl/1</c> is
	    removed.</item> <item><c>lib:progname/0</c> is replaced
	    by <c>ct:get_progname/0</c>.</item>
	    <item><c>lib:send/2</c> is removed.</item>
	    <item><c>lib:sendw/2</c> is removed.</item> </list>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-15072 Aux Id: PR 1786, OTP-15114 </p>
        </item>
        <item>
          <p>
	    Function <c>ets:delete_all_objects/1</c> now yields the
	    scheduler thread for large tables that take significant
	    time to clear. This to improve real time characteristics
	    of other runnable processes.</p>
          <p>
	    Own Id: OTP-15078</p>
        </item>
        <item>
	    <p> In control sequences of the functions
	    <c>io:fwrite/2,3</c> and <c>io_lib:fwrite/2,3</c>
	    containing <c>p</c> or <c>P</c>, a field width of value
	    <c>0</c> means that no line breaks are inserted. This is
	    in contrast to the old behaviour, where <c>0</c> used to
	    insert line breaks after every subterm. To insert line
	    breaks after every subterm, a field width of value
	    <c>1</c> can be used. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-15103 Aux Id: ERL-607 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.5.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>List subtraction (The <c>--</c> operator) will now
	    yield properly on large inputs.</p>
          <p>
	    Own Id: OTP-15371</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The <c>Module:init/1</c> function in <c>gen_statem</c>
	    may return an actions list containing any action, but an
	    erroneous check only allowed state enter actions so e.g
	    <c>{next_event,internal,event}</c> caused a server crash.
	    This bug has been fixed.</p>
          <p>
	    Own Id: OTP-13995</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Correct <c>filelib:find_source()</c> and
	    <c>filelib:find_file()</c> to by default also search one
	    level below <c>src</c>. This is in accordance with the
	    Design Principles which states that an application can
	    have Erlang source files one level below the <c>src</c>
	    directory. </p>
          <p>
	    Own Id: OTP-14832 Aux Id: ERL-527 </p>
        </item>
        <item>
	    <p> The contract of <c>erl_tar:table/2</c> is corrected.
	    </p>
          <p>
	    Own Id: OTP-14860 Aux Id: PR 1670 </p>
        </item>
        <item>
	    <p> Correct a few contracts. </p>
          <p>
	    Own Id: OTP-14889</p>
        </item>
        <item>
          <p>
	    Fix string:prefix/2 to handle an empty string as second
	    argument.</p>
          <p>
	    Own Id: OTP-14942 Aux Id: PR-1702 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Make <c>ets:i/1</c> exit cleaner when ^D is input
	    while browsing a table. Only the old Erlang shell is
	    affected (<c>erl(1)</c> flag <c>-oldshell</c>). </p>
          <p>
	    Own Id: OTP-14663</p>
        </item>
        <item>
          <p>
	    Fixed handling of windows UNC paths in module
	    <c>filename</c>.</p>
          <p>
	    Own Id: OTP-14693</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Improve performance of the new string functionality when
	    handling ASCII characters.</p>
          <p>
	    Own Id: OTP-14670</p>
        </item>
        <item>
          <p>
	    Added a clarification to the documentation of
	    <c>unicode:characters_to_list/2</c>.</p>
          <p>
	    Own Id: OTP-14798</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Fix a bug in the Erlang shell where recursively
	    defined records with typed fields could cause a loop.
	    </p>
          <p>
	    Own Id: OTP-14488 Aux Id: PR-1489 </p>
        </item>
        <item>
          <p>
	    Make edlin handle grapheme clusters instead of codepoints
	    to improve the handling multi-codepoints characters.</p>
          <p>
	    Own Id: OTP-14542</p>
        </item>
        <item>
	    <p>There could be false warnings for
	    <c>erlang:get_stacktrace/0</c> being used outside of a
	    <c>try</c> block when using multiple <c>catch</c>
	    clauses.</p>
          <p>
	    Own Id: OTP-14600 Aux Id: ERL-478 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The Erlang code linter no longer checks that the
	    functions mentioned in <c>nowarn_deprecated_function</c>
	    options are declared in the module. </p>
          <p>
	    Own Id: OTP-14378</p>
        </item>
        <item>
          <p>
	    General Unicode improvements.</p>
          <p>
	    Own Id: OTP-14462</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> A bug in <c>proc_lib:format()</c> introduced in
	    Erlang/OTP 20.0 is corrected. </p>
          <p>
	    Own Id: OTP-14482 Aux Id: PR-1488 </p>
        </item>
        <item>
          <p>
	    Fix string:len/1 to be compatible with previous versions.</p>
          <p>
	    Own Id: OTP-14487 Aux Id: ERIERL-40 </p>
        </item>
        <item>
          <p>
	    In OTP-20.0, the behavior of c, make, and ct_make was
	    changed so that in some cases the beam files by default
	    would be written to the directory where the source files
	    were found. This is now changed back to the old behavior
	    so beam files are by default written to current
	    directory.</p>
          <p>
	    Own Id: OTP-14489 Aux Id: ERL-438 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>For many releases, it has been legal to override a BIF
	    with a local function having the same name. However,
	    calling a local function with the same name as guard BIF
	    as filter in a list comprehension was not allowed.</p>
          <p>
	    Own Id: OTP-13690</p>
        </item>
        <item>
	    <p> A new (default) pseudo-random number generator
	    algorithm Xoroshiro116+ has been implemented in the
	    <c>rand</c> module. </p><p> The old algorithm
	    implementations had a number of flaws so they are all
	    deprecated, but corrected versions of two of them have
	    been added. See the documentation. </p>
          <p>
	    Own Id: OTP-14295 Aux Id: PR-1372 </p>
        </item>
        <item>
	    <p> The Erlang shell, <c>qlc:string_to_handle()</c>, and
	    the Debugger (the Evaluator area and Edit variable window
	    of the Bindings area) can parse pids, ports, references,
	    and external funs, as long as they can be created in the
	    running system. </p>
          <p>
	    Own Id: OTP-14296</p>
        </item>
        <item>
	    <p>Internal code change: Calls to <c>catch</c> followed
	    by a call to <c>erlang:get_stacktrace/0</c> has been
	    rewritten to use <c>try</c> instead of <c>catch</c> to
	    make the code future-proof.</p>
          <p>
	    Own Id: OTP-14400</p>
        </item>
        <item>
	    <p> The <c>ms_transform</c> module, used by
	    <c>ets:fun2ms/1</c> and <c>dbg:fun2ms/1</c>, evaluates
	    constant arithmetic expressions. This is necessary since
	    the Erlang compiler, which normally evaluates constant
	    expressions, does not recognize the format generated by
	    <c>ms_transform</c>. </p>
          <p>
	    Own Id: OTP-14454 Aux Id: ERIERL-29 </p>
        </item>
        <item>
	    <p> The state machine engine <c>gen_statem</c> can now
	    handle generic time-outs (multiple named) as well as
	    absolute time-out time. See the documentation. </p><p>
	    The <c>gen_statem</c> callback <c>Module:init/1</c> has
	    become mandatory to harmonize with other <c>gen_*</c>
	    modules. This may be an incompatibility for
	    <c>gen_statem</c> callback modules that use
	    <c>gen_statem:enter_loop/4-6</c>. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14531</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Improved unicode support for strings. Added normalization
	    functions in the <c>unicode</c> module. Extended the
	    <c>string</c> module API with new functions with improved
	    unicode handling and that works on grapheme clusters. The
	    new functions operates on the <c>unicode:chardata()</c>
	    type, thus they also accept <c>UTF-8 binaries</c> as
	    input. </p>
          <p>
	    The old string API have been marked as obsolete. The
	    return values have been changed for some error cases.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10289 Aux Id: OTP-10309 </p>
        </item>
        <item>
	    <p>There are two new guard BIFs '<c>floor/1</c>' and
	    '<c>ceil/1</c>'. They both return integers. In the
	    '<c>math</c>' module, there are two new BIFs with the
	    same names that return floating point values.</p>
          <p>
	    Own Id: OTP-13692</p>
        </item>
        <item>
          <p>
	    Making code_change, terminate and handle_info callbacks
	    optional in the OTP behaviours.</p>
          <p>
	    Own Id: OTP-13801</p>
        </item>
        <item>
	    <p> The support for Dets files created with Erlang/OTP R7
	    and earlier is removed. </p>
          <p>
	    Own Id: OTP-13830</p>
        </item>
        <item>
	    <p>Replaced usage of deprecated symbolic <seealso
	    marker="erts:erlang#type-time_unit"><c>time
	    unit</c></seealso> representations.</p>
          <p>
	    Own Id: OTP-13831 Aux Id: OTP-13735 </p>
        </item>
        <item>
	    <p>The function <c>fmod/2</c> has been added to the
	    <c>math</c> module.</p>
          <p>
	    Own Id: OTP-14000</p>
        </item>
        <item>
	    <p>The EXIT signals received from processes using
	    <c>proc_lib</c> now looks like EXIT signals from
	    processes that were spawned using <c>spawn_link</c>. In
	    particular, that means that the stack trace is now
	    included in the EXIT signal so that it can see where the
	    process crashed.</p>
          <p>
	    Own Id: OTP-14001</p>
        </item>
        <item>
	    <p><c>sets:add_element/2</c> is faster when adding an
	    element that is already present, and
	    <c>sets:del_element/2</c> is faster when the element to
	    be deleted is not present. This optimization can make
	    certain operations, such as sets:union/2 with many
	    overlapping elements, up to two orders of magnitude
	    faster.</p>
          <p>
	    Own Id: OTP-14035</p>
        </item>
        <item>
          <p>
	    Add information in doc about supervisor shutdown reason
	    when maximum restart frequency is reached.</p>
          <p>
	    Own Id: OTP-14037 Aux Id: PR-1233 </p>
        </item>
        <item>
          <p>
	    Added <c>rand:jump/[0|1]</c> functions.</p>
          <p>
	    Own Id: OTP-14038 Aux Id: PR-1235 </p>
        </item>
        <item>
	    <p>Functions for detecting changed code has been added.
	    <c>code:modified_modules/0</c> returns all currently
	    loaded modules that have changed on disk.
	    <c>code:module_status/1</c> returns the status for a
	    module. In the shell and in <c>c</c> module, <c>mm/0</c>
	    is short for <c>code:modified_modules/0</c>, and
	    <c>lm/0</c> reloads all currently loaded modules that
	    have changed on disk.</p>
          <p>
	    Own Id: OTP-14059</p>
        </item>
        <item>
	    <p>Each assert macro in <c>assert.hrl</c> now has a
	    corresponding version with an extra argument, for adding
	    comments to assertions. These can for example be printed
	    as part of error reports, to clarify the meaning of the
	    check that failed.</p>
          <p>
	    Own Id: OTP-14066</p>
        </item>
        <item>
	    <p><c>error_logger_tty_h</c> and
	    <c>error_logger_file_h</c> now inserts the node
	    information for nonlocal messages before the message
	    itself instead of after, both for readability and so as
	    not to change the line termination property at the end of
	    the message.</p>
          <p>
	    Own Id: OTP-14068</p>
        </item>
        <item>
	    <p>The Erlang code linter checks for badly formed type
	    constraints. </p>
          <p>
	    Own Id: OTP-14070 Aux Id: PR-1214 </p>
        </item>
        <item>
	    <p>By default, there will now be a warning when
	    <c>export_all</c> is used. The warning can be disabled
	    using <c>nowarn_export_all</c>.</p>
          <p>
	    Own Id: OTP-14071</p>
        </item>
        <item>
	    <p>When a <c>gen_server</c> process crashes, the
	    stacktrace for the client will be printed to facilitate
	    debugging.</p>
          <p>
	    Own Id: OTP-14089</p>
        </item>
        <item>
	    <p>Optimized ETS operations by changing table identifier
	    type from integer to reference. The reference enables a
	    more direct mapping to the table with less potential lock
	    contention and makes especially creation and deletion of
	    tables scale much better.</p> <p>The change of the opaque
	    type for the ETS table identifiers may cause failure in
	    code that make faulty assumptions about this opaque
	    type.</p> <note> <p> The number of tables stored at one
	    Erlang node <em>used</em> to be limited. This is no
	    longer the case (except by memory usage). The previous
	    default limit was about 1400 tables and could be
	    increased by setting the environment variable
	    <c>ERL_MAX_ETS_TABLES</c> before starting the Erlang
	    runtime system. This hard limit has been removed, but it
	    is currently useful to set the <c>ERL_MAX_ETS_TABLES</c>
	    anyway. It should be set to an approximate of the maximum
	    amount of tables used. This since an internal table for
	    named tables is sized using this value. If large amounts
	    of named tables are used and <c>ERL_MAX_ETS_TABLES</c>
	    hasn't been increased, the performance of named table
	    lookup will degrade. </p> </note>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14094</p>
        </item>
        <item>
	    <p><c>take/2</c> has been added to <c>dict</c>,
	    <c>orddict</c>, and <c>gb_trees</c>. <c>take_any/2</c>
	    has been added to <c>gb_trees</c>.</p>
          <p>
	    Own Id: OTP-14102</p>
        </item>
        <item>
          <p>
	    Extend gen_event API to handle options as well.</p>
          <p>
	    Own Id: OTP-14123</p>
        </item>
        <item>
          <p>
	    Advice on how to tune the supervisor restart frequency
	    (intensity and period) is added to System Documentation -
	    Design Principles - Supervisor Behaviour.</p>
          <p>
	    Own Id: OTP-14168 Aux Id: PR-1289 </p>
        </item>
        <item>
          <p>
	    gen_fsm is deprecated and is replaced by gen_statem,
	    however for backwards compatibility reasons gen_fsm may
	    continue to exist as an undocumented feature for quite
	    some time.</p>
          <p>
	    Own Id: OTP-14183</p>
        </item>
        <item>
	    <p>The shell functions <c>c/1</c> and <c>c/2</c> have
	    been extended so that if the argument is a module name
	    instead of a file name, it automatically locates the
	    .beam file and the corresponding source file, and then
	    recompiles the module using the same compiler options
	    (plus any options passed to c/2). If compilation fails,
	    the old beam file is preserved. Also adds <c>c(Mod, Opts,
	    Filter)</c>, where the Filter argument allows you to
	    remove old compiler options before the new options are
	    added.</p> <p>New utility functions <c>file_find/2/3</c>
	    and <c>find_source/1/2/3</c> have been added to
	    <c>filelib</c>.</p>
          <p>
	    Own Id: OTP-14190</p>
        </item>
        <item>
	    <p><c>erl_tar</c> in previous versions of OTP only
	    supports the USTAR format. That limited path names to at
	    most 255 bytes, and did not support Unicode characters in
	    names in a portable way.</p>
	    <p><c>erl_tar</c> now has support for reading tar
	    archives in the formats currently in common use, such as
	    v7, STAR, USTAR, PAX, and GNU tar's extensions to the
	    STAR/USTAR format. When writing tar archives,
	    <c>erl_tar</c> can now write them in the <c>PAX</c>
	    format if necessary (for example, to support very long
	    filenames or filenames with Unicode characters). If
	    possible, <c>erl_tar</c> will still write tar archives in
	    the USTAR for maximum portability.</p>
          <p>
	    Own Id: OTP-14226</p>
        </item>
        <item>
	    <p><c>base64:mime_decode/1</c> has been optimized so that
	    it is now almost as fast as<c>base64:decode/1</c>; it
	    used be noticeably slower.</p>
          <p>
	    Own Id: OTP-14245</p>
        </item>
        <item>
	    <p><c>erl_tar</c> will now strip any leading '<c>/</c>'
	    from pathnames when extracting files from a tar archive
	    and write a message to the error logger. There is also
	    new check for directory traversal attacks; if a relative
	    path points above the current working directory the
	    extraction will be aborted.</p>
          <p>
	    Own Id: OTP-14278</p>
        </item>
        <item>
	    <p> Miscellaneous updates due to atoms containing
	    arbitrary Unicode characters. </p>
          <p>
	    Own Id: OTP-14285</p>
        </item>
        <item>
          <p>
	    The Crypto application now supports generation of
	    cryptographically strong random numbers (floats &lt; 1.0
	    and integer arbitrary ranges) as a plugin to the 'rand'
	    module.</p>
          <p>
	    Own Id: OTP-14317 Aux Id: PR-1372 </p>
        </item>
        <item>
          <p>
	    Add new function <c>ets:select_replace/2</c> which
	    performs atomic "compare-and-swap" operations for ETS
	    objects using match specifications.</p>
          <p>
	    Own Id: OTP-14319 Aux Id: PR-1076 </p>
        </item>
        <item>
	    <p> The Erlang code linter checks for bad <c>dialyzer</c>
	    attributes. It also checks for bad type variables in type
	    declarations. </p>
          <p>
	    Own Id: OTP-14323</p>
        </item>
        <item>
	    <p> Two new functions has been implemented in the
	    <c>rand</c> module; <c>normal/2</c> and
	    <c>normal_s/3</c>, that both produce normal distribution
	    (pseudo) random numbers with mean value and variance
	    according to arguments. </p>
          <p>
	    Own Id: OTP-14328 Aux Id: PR-1382 </p>
        </item>
        <item>
          <p>
	    Upgraded the OTP internal PCRE library from version 8.33
	    to version 8.40. This library is used for implementation
	    of the <seealso marker="stdlib:re"><c>re</c></seealso>
	    regular expressions module.</p>
          <p>
	    Besides various bug fixes, the new version allows for
	    better stack protection. In order to utilize this
	    feature, the stack size of normal scheduler threads is
	    now by default set to 128 kilo words on all platforms.
	    The stack size of normal scheduler threads can be set
	    upon system start by passing the <seealso
	    marker="erts:erl#sched_thread_stack_size"><c>+sss</c></seealso>
	    command line argument to the <seealso
	    marker="erts:erl"><c>erl</c></seealso> command.</p>
          <p>
	    See <url
	    href="http://pcre.org/original/changelog.txt">http://pcre.org/original/changelog.txt</url>
	    for information about changes made to PCRE between the
	    versions 8.33 and 8.40.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-14331 Aux Id: ERL-208 </p>
        </item>
        <item>
          <p>
	    Added function <c>re:version/0</c> which returns
	    information about the OTP internal PCRE version used for
	    implementation of the <c>re</c> module.</p>
          <p>
	    Own Id: OTP-14347 Aux Id: PR-1412 </p>
        </item>
        <item>
	    <p>The format of debug information that is stored in BEAM
	    files (when <c>debug_info</c> is used) has been changed.
	    The purpose of the change is to better support other
	    BEAM-based languages such as Elixir or LFE.</p>
	    <p>All tools included in OTP (dialyzer, debugger, cover,
	    and so on) will handle both the new format and the
	    previous format. Tools that retrieve the debug
	    information using <c>beam_lib:chunk(Beam,
	    [abstract_code])</c> will continue to work with both the
	    new and old format. Tools that call
	    <c>beam_lib:chunk(Beam, ["Abst"])</c> will not work with
	    the new format.</p>
	    <p>For more information, see the description of
	    <c>debug_info</c> in the documentation for
	    <c>beam_lib</c> and the description of the
	    <c>{debug_info,{Backend,Data}}</c> option in the
	    documentation for <c>compile</c>.</p>
          <p>
	    Own Id: OTP-14369 Aux Id: PR-1367 </p>
        </item>
        <item>
          <p>
	    Add option hibernate_after to gen_server, gen_statem and
	    gen_event. Also added to the deprecated gen_fsm
	    behaviour.</p>
          <p>
	    Own Id: OTP-14405</p>
        </item>
        <item>
	    <p> The size of crash reports created by
	    <c>gen_server</c>, <c>gen_statem</c> and <c>proc_lib</c>
	    is limited with aid of the Kernel application variable
	    <c>error_logger_format_depth</c>. The purpose is to limit
	    the size of the messages sent to the <c>error_logger</c>
	    process when processes with huge message queues or states
	    crash. </p> <p>The crash report generated by
	    <c>proc_lib</c> includes the new tag
	    <c>message_queue_len</c>. The neighbour report also
	    includes the new tag <c>current_stacktrace</c>. Finally,
	    the neighbour report no longer includes the tags
	    <c>messages</c> and <c>dictionary</c>. </p> <p> The new
	    function <c>error_logger:get_format_depth/0</c> can be
	    used to retrieve the value of the Kernel application
	    variable <c>error_logger_format_depth</c>. </p>
          <p>
	    Own Id: OTP-14417</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>An escript with only two lines would not work.</p>
          <p>
	    Own Id: OTP-14098</p>
        </item>
        <item>
	    <p> Characters (<c>$char</c>) can be used in constant
	    pattern expressions. They can also be used in types and
	    contracts. </p>
          <p>
	    Own Id: OTP-14103 Aux Id: ERL-313 </p>
        </item>
        <item>
	    <p> The signatures of <c>erl_parse:anno_to_term/1</c> and
	    <c>erl_parse:anno_from_term/1</c> are corrected. Using
	    these functions no longer results in false Dialyzer
	    warnings. </p>
          <p>
	    Own Id: OTP-14131</p>
        </item>
        <item>
	    <p>Pretty-printing of maps is improved. </p>
          <p>
	    Own Id: OTP-14175 Aux Id: seq13277 </p>
        </item>
        <item>
	    <p>If any of the following functions in the <c>zip</c>
	    module crashed, a file would be left open:
	    <c>extract()</c>, <c>unzip()</c>, <c>create()</c>, or
	    <c>zip()</c>. This has been corrected.</p>
	    <p>A <c>zip</c> file having a "Unix header" could not be
	    unpacked.</p>
          <p>
	    Own Id: OTP-14189 Aux Id: ERL-348, ERL-349 </p>
        </item>
        <item>
	    <p> Improve the Erlang shell's tab-completion of long
	    names. </p>
          <p>
	    Own Id: OTP-14200 Aux Id: ERL-352 </p>
        </item>
        <item>
          <p>
	    The reference manual for <c>sys</c> had some faulty
	    information about the 'get_modules' message used by
	    processes where modules change dynamically during
	    runtime. The documentation is now corrected.</p>
          <p>
	    Own Id: OTP-14248 Aux Id: ERL-367 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Bug fixes, new features and improvements to gen_statem:</p>
          <p>
	    A new type init_result/1 has replaced the old
	    init_result/0, so if you used that old type (that was
	    never documented) you have to change your code, which may
	    be regarded as a potential incompatibility.</p>
          <p>
	    Changing callback modes after code change did not work
	    since the new callback mode was not recorded. This bug
	    has been fixed.</p>
          <p>
	    The event types state_timeout and {call,From} could not
	    be generated with a {next_event,EventType,EventContent}
	    action since they did not pass the runtime type check.
	    This bug has now been corrected.</p>
          <p>
	    State entry calls can now be repeated using (new) state
	    callback returns {repeat_state,...},
	    {repeat_state_and_data,_} and repeat_state_and_data.</p>
          <p>
	    There have been lots of code cleanup in particular
	    regarding timer handling. For example is async
	    cancel_timer now used. Error handling has also been
	    cleaned up.</p>
          <p>
	    To align with probable future changes to the rest of
	    gen_*, terminate/3 has now got a fallback and
	    code_change/4 is not mandatory.</p>
          <p>
	    Own Id: OTP-14114</p>
        </item>
        <item>
	    <p><c>filename:safe_relative_path/1</c> to sanitize a
	    relative path has been added.</p>
          <p>
	    Own Id: OTP-14215</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    When a simple_one_for_one supervisor is shutting down,
	    and a child exits with an exit reason of the form
	    {shutdown, Term}, an error report was earlier printed.
	    This is now corrected.</p>
          <p>
	    Own Id: OTP-13907 Aux Id: PR-1158, ERL-163 </p>
        </item>
        <item>
	    <p> Allow empty list as parameter of the fun used with
	    <c>dbg:fun2ms/1</c>. </p>
          <p>
	    Own Id: OTP-13974</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The new behaviour gen_statem has been improved with 3 new
	    features: the possibility to use old style non-proxy
	    timeouts for gen_statem:call/2,3, state entry code, and
	    state timeouts. These are backwards compatible. Minor
	    code and documentation improvements has been performed
	    including a borderline semantics correction of timeout
	    zero handling.</p>
          <p>
	    Own Id: OTP-13929 Aux Id: PR-1170, ERL-284 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The <c>zip:unzip/1,2</c> and <c>zip:extract/1,2</c>
	    functions have been updated to handle directory traversal
	    exploits. Any element in the zip file that contains a
	    path that points to a directory above the top level
	    working directory, <c>cwd</c>, will instead be extracted
	    in <c>cwd</c>. An error message is printed for any such
	    element in the zip file during the unzip operation. The
	    <c>keep_old_files</c> option determines if a file will
	    overwrite a previous file with the same name within the
	    zip file.</p>
          <p>
	    Own Id: OTP-13633</p>
        </item>
        <item>
	    <p> Correct the contracts for
	    <c>ets:match_object/1,3</c>. </p>
          <p>
	    Own Id: OTP-13721 Aux Id: PR-1113 </p>
        </item>
        <item>
          <p>
	    Errors in type specification and Emacs template
	    generation for <c>gen_statem:code_change/4</c> has been
	    fixed from bugs.erlang.org's Jira cases ERL-172 and
	    ERL-187.</p>
          <p>
	    Own Id: OTP-13746 Aux Id: ERL-172, ERL-187 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    gen_statem has been changed to set the callback mode for
	    a server to what Module:callback_mode/0 returns. This
	    facilitates e.g code downgrade since the callback mode
	    now becomes a property of the currently active code, not
	    of the server process.</p>
          <p>
	    Exception handling from Module:init/1 has also been
	    improved.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-13752</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.0.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Correct a bug regarding typed records in the Erlang
	    shell. The bug was introduced in OTP-19.0. </p>
          <p>
	    Own Id: OTP-13719 Aux Id: ERL-182 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 3.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Fix a race bug affecting <c>dets:open_file/2</c>.
	    </p>
          <p>
	    Own Id: OTP-13260 Aux Id: seq13002 </p>
        </item>
        <item>
	    <p>Don't search for non-existing Map keys twice</p>
	    <p>For <c>maps:get/2,3</c> and <c>maps:find/2</c>,
	    searching for an immediate key, e.g. an atom, in a small
	    map, the search was performed twice if the key did not
	    exist.</p>
          <p>
	    Own Id: OTP-13459</p>
        </item>
        <item>
          <p>
	    Avoid stray corner-case math errors on Solaris, e.g. an
	    error is thrown on underflows in exp() and pow() when it
	    shouldn't be.</p>
          <p>
	    Own Id: OTP-13531</p>
        </item>
        <item>
	    <p>Fix linting of map key variables</p>
	    <p>Map keys cannot be unbound and then used in parallel
	    matching.</p>
	    <p>Example: <c> #{ K := V } = #{ k := K } = M.</c> This
	    is illegal if <c>'K'</c> is not bound.</p>
          <p>
	    Own Id: OTP-13534 Aux Id: ERL-135 </p>
        </item>
        <item>
          <p>
	    Fixed a bug in re on openbsd where sometimes re:run would
	    return an incorrect result.</p>
          <p>
	    Own Id: OTP-13602</p>
        </item>
        <item>
          <p>
	    To avoid potential timer bottleneck on supervisor
	    restart, timer server is no longer used when the
	    supervisor is unable to restart a child.</p>
          <p>
	    Own Id: OTP-13618 Aux Id: PR-1001 </p>
        </item>
        <item>
	    <p> The Erlang code preprocessor (<c>epp</c>) can handle
	    file names spanning over many tokens. Example:
	    <c>-include("a" "file" "name").</c>. </p>
          <p>
	    Own Id: OTP-13662 Aux Id: seq13136 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The types of The Abstract Format in the
	    <c>erl_parse</c> module have been refined. </p>
          <p>
	    Own Id: OTP-10292</p>
        </item>
        <item>
	    <p> Undocumented syntax for function specifications,
	    <c>-spec F/A :: Domain -&gt; Range</c>, has been removed
	    (without deprecation). </p> <p> Using the
	    <c>is_subtype(V, T)</c> syntax for constraints (in
	    function specifications) is no longer documented, and the
	    newer syntax <c>V :: T</c> should be used instead. The
	    Erlang Parser still recognizes the <c>is_subtype</c>
	    syntax, and will continue to do so for some time. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-11879</p>
        </item>
        <item>
	    <p>The '<c>random</c>' module has been deprecated. Use
	    the '<c>rand</c>' module instead.</p>
          <p>
	    Own Id: OTP-12502 Aux Id: OTP-12501 </p>
        </item>
        <item>
	    <p>Background: In record fields with a type declaration
	    but without an initializer, the Erlang parser inserted
	    automatically the singleton type <c>'undefined'</c> to
	    the list of declared types, if that value was not present
	    there. That is, the record declaration:</p>
          <p>
	    -record(rec, {f1 :: float(), f2 = 42 :: integer(), f3 ::
	    some_mod:some_typ()}).</p>
	    <p>was translated by the parser to:</p>
          <p>
	    -record(rec, {f1 :: float() | 'undefined', f2 = 42 ::
	    integer(), f3 :: some_mod:some_typ() | 'undefined'}).</p>
	    <p>The rationale for this was that creation of a "dummy"
	    <c>#rec{}</c> record should not result in a warning from
	    dialyzer that, for example, the implicit initialization
	    of the <c>#rec.f1</c> field violates its type
	    declaration.</p>
	    <p>Problems: This seemingly innocent action has some
	    unforeseen consequences.</p>
	    <p>For starters, there is no way for programmers to
	    declare that e.g. only floats make sense for the
	    <c>f1</c> field of <c>#rec{}</c> records when there is no
	    "obvious" default initializer for this field. (This also
	    affects tools like PropEr that use these declarations
	    produced by the Erlang parser to generate random
	    instances of records for testing purposes.)</p>
	    <p>It also means that dialyzer does not warn if e.g. an
	    <c>is_atom/1</c> test or something more exotic like an
	    <c>atom_to_list/1</c> call is performed on the value of
	    the <c>f1</c> field.</p>
	    <p>Similarly, there is no way to extend dialyzer to warn
	    if it finds record constructions where <c>f1</c> is not
	    initialized to some float.</p>
	    <p>Last but not least, it is semantically problematic
	    when the type of the field is an opaque type: creating a
	    union of an opaque and a structured type is very
	    problematic for analysis because it fundamentally breaks
	    the opacity of the term at that point.</p>
	    <p>Change: To solve these problems the parser will not
	    automatically insert the <c>'undefined'</c> value
	    anymore; instead the user has the option to choose the
	    places where this value makes sense (for the field) and
	    where it does not and insert the <c>| 'undefined'</c>
	    there manually.</p>
	    <p>Consequences of this change: This change means that
	    dialyzer will issue a warning for all places where
	    records with uninitialized fields are created and those
	    fields have a declared type that is incompatible with
	    <c>'undefined'</c> (e.g. <c>float()</c>). This warning
	    can be suppressed easily by adding <c>| 'undefined'</c>
	    to the type of this field. This also adds documentation
	    that the user really intends to create records where this
	    field is uninitialized.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-12719</p>
        </item>
        <item>
	    <p> Remove deprecated functions in the modules
	    <c>erl_scan</c> and <c>erl_parse</c>. </p>
          <p>
	    Own Id: OTP-12861</p>
        </item>
        <item>
	    <p>The pre-processor can now expand the ?FUNCTION_NAME
	    and ?FUNCTION_ARITY macros.</p>
          <p>
	    Own Id: OTP-13059</p>
        </item>
        <item>
	    <p> A new behaviour <c>gen_statem</c> has been
	    implemented. It has been thoroughly reviewed, is stable
	    enough to be used by at least two heavy OTP applications,
	    and is here to stay. But depending on user feedback, we
	    do not expect but might find it necessary to make minor
	    not backwards compatible changes into OTP-20.0, so its
	    state can be designated as "not quite experimental"...
	    </p> <p> The <c>gen_statem</c> behaviour is intended to
	    replace <c>gen_fsm</c> for new code. It has the same
	    features and add some really useful: </p> <list
	    type="bulleted"> <item>State code is gathered</item>
	    <item>The state can be any term</item> <item>Events can
	    be postponed</item> <item>Events can be self
	    generated</item> <item>A reply can be sent from a later
	    state</item> <item>There can be multiple sys traceable
	    replies</item> </list> <p> The callback model(s) for
	    <c>gen_statem</c> differs from the one for
	    <c>gen_fsm</c>, but it is still fairly easy to rewrite
	    from <c>gen_fsm</c> to <c>gen_statem</c>. </p>
          <p>
	    Own Id: OTP-13065 Aux Id: PR-960 </p>
        </item>
        <item>
          <p>
	    Optimize binary:split/2 and binary:split/3 with native
	    BIF implementation.</p>
          <p>
	    Own Id: OTP-13082</p>
        </item>
        <item>
	    <p>Background: The types of record fields have since R12B
	    been put in a separate form by <c>epp:parse_file()</c>,
	    leaving the record declaration form untyped. The separate
	    form, however, does not follow the syntax of type
	    declarations, and parse transforms inspecting
	    <c>-type()</c> attributes need to know about the special
	    syntax. Since the compiler stores the return value of
	    <c>epp:parse_file()</c> as debug information in the
	    abstract code chunk (<c>"Abst"</c> or
	    <c>abstract_code</c>), tools too need to know about the
	    special syntax, if they inspect <c>-type()</c> attributes
	    in abstract code.</p>
	    <p>Change: No separate type form is created by
	    <c>epp:parse_file()</c>, but the type information is kept
	    in the record fields. This means that all parse
	    transforms and all tools inspecting <c>-record()</c>
	    declarations need to recognize <c>{typed_record_field,
	    Field, Type}</c>.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-13148</p>
        </item>
        <item>
          <p>
	    Unsized fields of the type <c>bytes</c> in binary
	    generators are now forbidden. (The other ways of writing
	    unsized fields, such as <c>binary</c>, are already
	    forbidden.)</p>
          <p>
	    Own Id: OTP-13152</p>
        </item>
        <item>
	    <p> The type <c>map()</c> is built-in, and cannot be
	    redefined. </p>
          <p>
	    Own Id: OTP-13153</p>
        </item>
        <item>
	    <p> Let <c>dets:open_file()</c> exit with a <c>badarg</c>
	    message if given a raw file name (a binary). </p>
          <p>
	    Own Id: OTP-13229 Aux Id: ERL-55 </p>
        </item>
        <item>
	    <p> Add <c>filename:basedir/2,3</c></p> <p>basedir
	    returns suitable path(s) for 'user_cache', 'user_config',
	    'user_data', 'user_log', 'site_config' and 'site_data'.
	    On linux and linux like systems the paths will respect
	    the XDG environment variables.</p>
          <p>
	    Own Id: OTP-13392</p>
        </item>
        <item>
	    <p>There are new preprocessor directives
	    <c>-error(Term)</c> and <c>-warning(Term)</c> to cause a
	    compilation error or a compilation warning,
	    respectively.</p>
          <p>
	    Own Id: OTP-13476</p>
        </item>
        <item>
          <p>
	    Optimize <c>'++'</c> operator and <c>lists:append/2</c>
	    by using a single pass to build a new list while checking
	    for properness.</p>
          <p>
	    Own Id: OTP-13487</p>
        </item>
        <item>
          <p>
	    Add <c>maps:update_with/3,4</c> and <c>maps:take/2</c></p>
          <p>
	    Own Id: OTP-13522 Aux Id: PR-1025 </p>
        </item>
        <item>
	    <p><c>lists:join/2</c> has been added. Similar to
	    <c>string:join/2</c> but works with arbitrary lists.</p>
          <p>
	    Own Id: OTP-13523</p>
        </item>
        <item>
	    <p>Obfuscate asserts to make Dialyzer shut up.</p>
          <p>
	    Own Id: OTP-13524 Aux Id: PR-1002 </p>
        </item>
        <item>
          <p>
	    Supervisors now explicitly add their callback module in
	    the return from sys:get_status/1,2. This is to simplify
	    custom supervisor implementations. The Misc part of the
	    return value from sys:get_status/1,2 for a supervisor is
	    now:</p>
          <p>
	    [{data, [{"State",
	    State}]},{supervisor,[{"Callback",Module}]}]</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-13619 Aux Id: PR-1000 </p>
        </item>
        <item>
          <p>
	    Relax translation of initial calls in <c>proc_lib</c>,
	    i.e. remove the restriction to only do the translation
	    for <c>gen_server</c> and <c>gen_fsm</c>. This enables
	    user defined <c>gen</c> based generic callback modules to
	    be displayed nicely in <c>c:i()</c> and observer.</p>
          <p>
	    Own Id: OTP-13623</p>
        </item>
        <item>
	    <p>The function <c>queue:lait/1</c> (misspelling of
	    <c>liat/1</c>) is now deprecated.</p>
          <p>
	    Own Id: OTP-13658</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.8</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix evaluation in matching of bound map key variables in
	    the interpreter.</p>
          <p>
	    Prior to this patch, the following code would not
	    evaluate: <c>X = key,(fun(#{X := value}) -&gt; true
	    end)(#{X => value})</c></p>
          <p>
	    Own Id: OTP-13218</p>
        </item>
        <item>
	    <p> Fix <c>erl_eval</c> not using non-local function
	    handler. </p>
          <p>
	    Own Id: OTP-13228 Aux Id: ERL-32 </p>
        </item>
        <item>
	    <p> The Erlang Code Linter no longer crashes if there is
	    a <c>-deprecated()</c> attribute but no <c>-module()</c>
	    declaration. </p>
          <p>
	    Own Id: OTP-13230 Aux Id: ERL-62 </p>
        </item>
        <item>
          <p>
	    The timestamp in the result returned by <c>dets:info(Tab,
	    safe_fixed)</c> was unintentionally broken as a result of
	    the time API rewrites in OTP 18.0. This has now been
	    fixed.</p>
          <p>
	    Own Id: OTP-13239 Aux Id: OTP-11997 </p>
        </item>
        <item>
	    <p>A rare race condition in <c>beam_lib</c> when using
	    encrypted abstract format has been eliminated.</p>
          <p>
	    Own Id: OTP-13278</p>
        </item>
        <item>
          <p>
	    Improved maps:with/2 and maps:without/2 algorithms</p>
          <p>
	    The new implementation speeds up the execution
	    significantly for all sizes of input.</p>
          <p>
	    Own Id: OTP-13376</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Time warp safety improvements.</p>
          <p>
	    Introduced the options <c>monotonic_timestamp</c>, and
	    <c>strict_monotonic_timestamp</c> to the trace,
	    sequential trace, and system profile functionality. This
	    since the already existing <c>timestamp</c> option is not
	    time warp safe.</p>
          <p>
	    Introduced the option <c>safe_fixed_monotonic_time</c> to
	    <c>ets:info/2</c> and <c>dets:info/2</c>. This since the
	    already existing <c>safe_fixed</c> option is not time
	    warp safe.</p>
          <p>
	    Own Id: OTP-13222 Aux Id: OTP-11997 </p>
        </item>
        <item>
          <p>
	    In the shell Ctrl+W (delete word) will no longer consider
	    "." as being part of a word.</p>
          <p>
	    Own Id: OTP-13281</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.7</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The Erlang Pretty Printer uses <c>::</c> for function
	    type constraints.</p> <p>A bug concerning pretty printing
	    of annotated type union elements in map pair types has
	    been fixed.</p> <p>Some minor issues regarding the
	    documentation of types and specs have been corrected.</p>
          <p>
	    Own Id: OTP-13084</p>
        </item>
        <item>
	    <p> The shell command <c>rp</c> prints strings as lists
	    of integers if pretty printing of lists is set to
	    <c>false</c>. </p>
          <p>
	    Own Id: OTP-13145</p>
        </item>
        <item>
          <p>
	    The shell would crash if a bit syntax expression with
	    conflicting types were given (e.g. if a field type was
	    given as '<c>integer-binary</c>'). (Thanks to Aleksei
	    Magusev for reporting this bug.)</p>
          <p>
	    Own Id: OTP-13157</p>
        </item>
        <item>
	    <p>The <c>rand:export_seed/0</c> would never return
	    '<c>undefined</c>' even if no seed has previously been
	    created. Fixed to return '<c>undefined</c>' if there is
	    no seed in the process dictionary.</p>
          <p>
	    Own Id: OTP-13162</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add support for the Delete, Home and End keys in the
	    Erlang shell.</p>
          <p>
	    Own Id: OTP-13032</p>
        </item>
        <item>
	    <p><c>beam_lib:all_chunks/1</c> and
	    <c>beam_lib:build_module/1</c> have been documented.</p>
          <p>
	    Own Id: OTP-13063</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> In OTP 18.0, <c>qlc</c> does not handle syntax errors
	    well. This bug has been fixed. </p>
          <p>
	    Own Id: OTP-12946</p>
        </item>
        <item>
          <p>
	    Optimize zip:unzip/2 when uncompressing to memory.</p>
          <p>
	    Own Id: OTP-12950</p>
        </item>
        <item>
          <p>
	    The STDLIB reference manual is updated to show
	    correct information about the return value of
	    <c>gen_fsm:reply/2</c>.</p>
          <p>
	    Own Id: OTP-12973</p>
        </item>
        <item>
	    <p>re:split2,3 and re:replace/3,4 now correctly handles
	    pre-compiled patterns that have been compiled using the
	    '<c>unicode</c>' option.</p>
          <p>
	    Own Id: OTP-12977</p>
        </item>
        <item>
          <p>
	    Export <c>shell:catch_exception/1</c> as documented.</p>
          <p>
	    Own Id: OTP-12990</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>A mechanism for limiting the amount of text that the
	    built-in error logger events will produce has been
	    introduced. It is useful for limiting both the size of
	    log files and the CPU time used to produce them.</p>
	    <p>This mechanism is experimental in the sense that it
	    may be changed if it turns out that it does not solve the
	    problem it is supposed to solve. In that case, there may
	    be backward incompatible improvements to this
	    mechanism.</p>
	    <p>See the documentation for the config parameter
	    <c>error_logger_format_depth</c> in the Kernel
	    application for information about how to turn on this
	    feature.</p>
          <p>
	    Own Id: OTP-12864</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix handling of single dot in filename:join/2</p>
          <p>
	    The reference manual says that filename:join(A,B) is
	    equivalent to filename:join([A,B]). In some rare cases
	    this turns out not to be true. For example:</p>
          <p>
	    <c>filename:join("/a/.","b") -&gt; "/a/./b"</c> vs
	    <c>filename:join(["/a/.","b"]) -&gt; "/a/b"</c>.</p>
          <p>
	    This has been corrected. A single dot is now only kept if
	    it occurs at the very beginning or the very end of the
	    resulting path.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-12158</p>
        </item>
        <item>
          <p>
	    The undocumented option <c>generic_debug</c> for
	    <c>gen_server</c> has been removed.</p>
          <p>
	    Own Id: OTP-12183</p>
        </item>
        <item>
          <p>
	    erl_lint:icrt_export/4 has been rewritten to make the
	    code really follow the scoping rules of Erlang, and not
	    just in most situations by accident.</p>
          <p>
	    Own Id: OTP-12186</p>
        </item>
        <item>
          <p>
	    Add 'trim_all' option to binary:split/3</p>
          <p>
	    This option can be set to remove _ALL_ empty parts of the
	    result of a call to binary:split/3.</p>
          <p>
	    Own Id: OTP-12301</p>
        </item>
        <item>
	    <p> Correct orddict(3) regarding evaluation order of
	    <c>fold()</c> and <c>map()</c>. </p>
          <p>
	    Own Id: OTP-12651 Aux Id: seq12832 </p>
        </item>
        <item>
          <p>
	    Correct <c>maps</c> module error exceptions </p>
          <p>
	    Bad input to maps module function will now yield the
	    following exceptions:</p>
          <list> <item>{badmap, NotMap}, or </item> <item>badarg.</item>
          </list>
          <p>
	    Own Id: OTP-12657</p>
        </item>
        <item>
          <p>
	    It is now possible to paste text in JCL mode (using
	    Ctrl-Y) that has been copied in the previous shell
	    session. Also a bug that caused the JCL mode to crash
	    when pasting text has been fixed.</p>
          <p>
	    Own Id: OTP-12673</p>
        </item>
        <item>
          <p>
	    Add <c>uptime()</c> shell command.</p>
          <p>
	    Own Id: OTP-12752</p>
        </item>
        <item>
          <p>
	    Cache nowarn_bif_clash functions in erl_lint.</p>
          <p>
	    This patch stores nowarn_bif_clash in the lint record. By
	    using erlc +'{eprof,lint_module}' when compiling the
	    erlang parser, we noticed the time spent on
	    nowarn_function/2 reduced from 30% to 0.01%.</p>
          <p>
	    Own Id: OTP-12754</p>
        </item>
        <item>
          <p>
	    Optimize the Erlang Code Linter by using the cached
	    filename information.</p>
          <p>
	    Own Id: OTP-12772</p>
        </item>
        <item>
          <p>
	    If a child of a simple_one_for_one returns ignore from
	    its start function no longer store the child for any
	    restart type. It is not possible to restart or delete the
	    child because the supervisor is a simple_one_for_one.</p>
          <p>
	    Own Id: OTP-12793</p>
        </item>
        <item>
          <p>
	    Make <c>ets:file2tab</c> preserve enabled
	    <c>read_concurrency</c> and <c>write_concurrency</c>
	    options for tables.</p>
          <p>
	    Own Id: OTP-12814</p>
        </item>
        <item>
          <p>
	    There are many cases where user code needs to be able to
	    distinguish between a socket that was closed normally and
	    one that was aborted. Setting the option
	    {show_econnreset, true} enables the user to receive
	    ECONNRESET errors on both active and passive sockets.</p>
          <p>
	    Own Id: OTP-12841</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Allow maps for supervisor flags and child specs</p>
          <p>
	    Earlier, supervisor flags and child specs were given as
	    tuples. While this is kept for backwards compatibility,
	    it is now also allowed to give these parameters as maps,
	    see <seealso
	    marker="stdlib:supervisor#sup_flags">sup_flags</seealso>
	    and <seealso
	    marker="stdlib:supervisor#child_spec">child_spec</seealso>.</p>
          <p>
	    Own Id: OTP-11043</p>
        </item>
        <item>
          <p>
	    A new system message, <c>terminate</c>, is added. This
	    can be sent with <c>sys:terminate/2,3</c>. If the
	    receiving process handles system messages properly it
	    will terminate shortly after receiving this message.</p>
          <p>
	    The new function <c>proc_lib:stop/1,3</c> utilizes this
	    new system message and monitors the receiving process in
	    order to facilitate a synchronous stop mechanism for
	    'special processes'.</p>
          <p>
	    <c>proc_lib:stop/1,3</c> is used by the following
	    functions:</p>
	    <list> <item><c>gen_server:stop/1,3</c> (new)</item>
	    <item><c>gen_fsm:stop/1,3</c> (new)</item>
	    <item><c>gen_event:stop/1,3</c> (modified to be
	    synchronous)</item> <item><c>wx_object:stop/1,3</c>
	    (new)</item> </list>
          <p>
	    Own Id: OTP-11173 Aux Id: seq12353 </p>
        </item>
        <item>
          <p>
	    Remove the <c>pg</c> module, which has been deprecated
	    through OTP-17, is now removed from the STDLIB
	    application. This module has been marked experimental for
	    more than 15 years, and has largely been superseded by
	    the <c>pg2</c> module from the Kernel application.</p>
          <p>
	    Own Id: OTP-11907</p>
        </item>
        <item>
          <p>
	    New BIF: <c>erlang:get_keys/0</c>, lists all keys
	    associated with the process dictionary. Note:
	    <c>erlang:get_keys/0</c> is auto-imported.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-12151 Aux Id: seq12521 </p>
        </item>
        <item>
	    <p> Add three new functions to <c>io_lib</c>--
	    <c>scan_format/2</c>, <c>unscan_format/1</c>, and
	    <c>build_text/1</c>-- which expose the parsed form of the
	    format control sequences to make it possible to easily
	    modify or filter the input to <c>io_lib:format/2</c>.
	    This can e.g. be used in order to replace unbounded-size
	    control sequences like <c>~w</c> or <c>~p</c> with
	    corresponding depth-limited <c>~W</c> and <c>~P</c>
	    before doing the actual formatting. </p>
          <p>
	    Own Id: OTP-12167</p>
        </item>
        <item>
	    <p> Introduce the <c>erl_anno</c> module, an abstraction
	    of the second element of tokens and tuples in the
	    abstract format. </p>
          <p>
	    Own Id: OTP-12195</p>
        </item>
        <item>
          <p>
	    Support variables as Map keys in expressions and patterns</p>
	    <p>Erlang will accept any expression as keys in Map
	    expressions and it will accept literals or bound
	    variables as keys in Map patterns.</p>
          <p>
	    Own Id: OTP-12218</p>
        </item>
        <item>
	    <p> The last traces of Mnemosyne Rules have been removed.
	    </p>
          <p>
	    Own Id: OTP-12257</p>
        </item>
        <item>
          <p>
	    Properly support maps in match_specs</p>
          <p>
	    Own Id: OTP-12270</p>
        </item>
        <item>
          <p>
	    New function <c>ets:take/2</c>. Works the same as
	    <c>ets:delete/2</c> but also returns the deleted
	    object(s).</p>
          <p>
	    Own Id: OTP-12309</p>
        </item>
        <item>
	    <p><c>string:tokens/2</c> is somewhat faster, especially
	    if the list of separators only contains one separator
	    character.</p>
          <p>
	    Own Id: OTP-12422 Aux Id: seq12774 </p>
        </item>
        <item>
	    <p>The documentation of the Abstract Format (in the ERTS
	    User's Guide) has been updated with types and
	    specification. (Thanks to Anthony Ramine.) </p> <p> The
	    explicit representation of parentheses used in types of
	    the abstract format has been removed. Instead the new
	    functions <c>erl_parse:type_inop_prec()</c> and
	    <c>erl_parse:type_preop_prec()</c> can be used for
	    inserting parentheses where needed. </p>
          <p>
	    Own Id: OTP-12492</p>
        </item>
        <item>
          <p>
	    Prevent zip:zip_open/[12] from leaking file descriptors
	    if parent process dies.</p>
          <p>
	    Own Id: OTP-12566</p>
        </item>
        <item>
          <p>
	    Add a new random number generator, see <c>rand</c>
	    module. It have better characteristics and an improved
	    interface.</p>
          <p>
	    Own Id: OTP-12586 Aux Id: OTP-12501, OTP-12502 </p>
        </item>
        <item>
	    <p><c>filename:split/1</c> when given an empty binary
	    will now return an empty list, to make it consistent with
	    return value when given an empty list.</p>
          <p>
	    Own Id: OTP-12716</p>
        </item>
        <item>
          <p>
	    Add <c>sync</c> option to <c>ets:tab2file/3</c>.</p>
          <p>
	    Own Id: OTP-12737 Aux Id: seq12805 </p>
        </item>
        <item>
	    <p> Add functions <c>gb_sets:iterator_from()</c> and
	    <c>gb_trees:iterator_from()</c>. (Thanks to Kirill
	    Kinduk.) </p>
          <p>
	    Own Id: OTP-12742</p>
        </item>
        <item>
          <p>
	    Add <c>maps:filter/2</c> to maps module.</p>
          <p>
	    Own Id: OTP-12745</p>
        </item>
        <item>
          <p>
	    Change some internal data structures to Maps in order to
	    speed up compilation time. Measured speed up is around
	    10%-15%.</p>
          <p>
	    Own Id: OTP-12774</p>
        </item>
        <item>
	    <p> Update <c>orddict</c> to use parameterized types and
	    specs. (Thanks to UENISHI Kota.) </p>
          <p>
	    Own Id: OTP-12785</p>
        </item>
        <item>
	    <p>The assert macros in <c>eunit</c> has been moved out
	    to <c>stdlib/include/assert.hrl</c>. This files get
	    included by <c>eunit.hrl</c>. Thus, nothing changes for
	    eunit users, but the asserts can now also be included
	    separately.</p>
          <p>
	    Own Id: OTP-12808</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Behaviour of character types \d, \w and \s has always
	    been to not match characters with value above 255, not
	    128, i.e. they are limited to ISO-Latin-1 and not ASCII</p>
          <p>
	    Own Id: OTP-12521</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    c:m/1 now displays the module's MD5 sum.</p>
          <p>
	    Own Id: OTP-12500</p>
        </item>
        <item>
          <p>
	    Make ets:i/1 handle binary input from IO server.</p>
          <p>
	    Own Id: OTP-12550</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The documentation of string:tokens/2 now explicitly
	    specifies that adjacent separator characters do not give
	    any empty strings in the resulting list of tokens.</p>
          <p>
	    Own Id: OTP-12036</p>
        </item>
        <item>
          <p>
	    Fix broken deprecation warnings in ssh application</p>
          <p>
	    Own Id: OTP-12187</p>
        </item>
        <item>
          <p>
	    Maps: Properly align union typed assoc values in
	    documentation</p>
          <p>
	    Own Id: OTP-12190</p>
        </item>
        <item>
          <p>
	    Fix filelib:wildcard/2 when 'Cwd' ends with a dot</p>
          <p>
	    Own Id: OTP-12212</p>
        </item>
        <item>
          <p>
	    Allow <c>Name/Arity</c> syntax in maps values inside
	    attributes.</p>
          <p>
	    Own Id: OTP-12213</p>
        </item>
        <item>
          <p>
	    Fix edlin to correctly save text killed with ctrl-u.
	    Prior to this fix, entering text into the Erlang shell
	    and then killing it with ctrl-u followed by yanking it
	    back with ctrl-y would result in the yanked text being
	    the reverse of the original killed text.</p>
          <p>
	    Own Id: OTP-12224</p>
        </item>
        <item>
          <p>
	    If a callback function was terminated with exit/1, there
	    would be no stack trace in the ERROR REPORT produced by
	    gen_server. This has been corrected.</p>
          <p>
	    To keep the backwards compatibility, the actual exit
	    reason for the process is not changed.</p>
          <p>
	    Own Id: OTP-12263 Aux Id: seq12733 </p>
        </item>
        <item>
          <p>
	    Warnings produced by <c>ms_transform</c> could point out
	    the wrong line number.</p>
          <p>
	    Own Id: OTP-12264</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Supports tar file creation on other media than file
	    systems mounted on the local machine.</p>
          <p>
	    The <c>erl_tar</c> api is extended with
	    <c>erl_tar:init/3</c> that enables usage of user provided
	    media storage routines. A ssh-specific set of such
	    routines is hidden in the new function
	    <c>ssh_sftp:open_tar/3</c> to simplify creating a tar
	    archive on a remote ssh server.</p>
          <p>
	    A chunked file reading option is added to
	    <c>erl_tar:add/3,4</c> to save memory on e.g small
	    embedded systems. The size of the slices read from a file
	    in that case can be specified.</p>
          <p>
	    Own Id: OTP-12180 Aux Id: seq12715 </p>
        </item>
        <item>
          <p>
	    I/O requests are optimized for long message queues in the
	    calling process.</p>
          <p>
	    Own Id: OTP-12315</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The type spec of the FormFunc argument to
	    sys:handle_debug/4 was erroneously pointing to dbg_fun().
	    This is now corrected and the new type is format_fun().</p>
          <p>
	    Own Id: OTP-11800</p>
        </item>
        <item>
          <p>
	    Behaviors such as gen_fsm and gen_server should always
	    invoke format_status/2 before printing the state to the
	    logs.</p>
          <p>
	    Own Id: OTP-11967</p>
        </item>
        <item>
	    <p> The documentation of <c>dets:insert_new/2</c> has
	    been corrected. (Thanks to Alexei Sholik for reporting
	    the bug.) </p>
          <p>
	    Own Id: OTP-12024</p>
        </item>
        <item>
          <p>
	    Printing a term with io_lib:format and control sequence
	    w, precision P and field width F, where F&lt; P would
	    fail in one of the two following ways:</p>
          <p>
	    1) If P &lt; printed length of the term, an infinite loop
	    would be entered, consuming all available memory.</p>
          <p>
	    2) If P &gt;= printed length of the term, an exception
	    would be raised.</p>
          <p>
	    These two problems are now corrected.</p>
          <p>
	    Own Id: OTP-12041</p>
        </item>
        <item>
          <p>
	    The documentation of <c>maps:values/1</c> has been
	    corrected.</p>
          <p>
	    Own Id: OTP-12055</p>
        </item>
        <item>
          <p>
	    Expand shell functions in map expressions.</p>
          <p>
	    Own Id: OTP-12063</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add maps:with/2</p>
          <p>
	    Own Id: OTP-12137</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.1.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    OTP-11850 fixed filelib:wildcard/1 to work with broken
	    symlinks. This correction, however, introduced problems
	    since symlinks were no longer followed for functions like
	    filelib:ensure_dir/1, filelib:is_dir/1,
	    filelib:file_size/1, etc. This is now corrected.</p>
          <p>
	    Own Id: OTP-12054 Aux Id: seq12660 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p><c>filelib:wildcard("broken_symlink")</c> would return
	    an empty list if "broken_symlink" was a symlink that did
	    not point to an existing file.</p>
          <p>
	    Own Id: OTP-11850 Aux Id: seq12571 </p>
        </item>
        <item>
	    <p><c>erl_tar</c> can now handle files names that contain
	    Unicode characters. See "UNICODE SUPPORT" in the
	    documentation for <c>erl_tar</c>.</p>
	    <p>When creating a tar file, <c>erl_tar</c> would
	    sometime write a too short end of tape marker. GNU tar
	    would correctly extract files from such tar file, but
	    would complain about "A lone zero block at...".</p>
          <p>
	    Own Id: OTP-11854</p>
        </item>
        <item>
	    <p> When redefining and exporting the type <c>map()</c>
	    the Erlang Code Linter (<c>erl_lint</c>) erroneously
	    emitted an error. This bug has been fixed. </p>
          <p>
	    Own Id: OTP-11872</p>
        </item>
        <item>
          <p>
	    Fix evaluation of map updates in the debugger and
	    erl_eval</p>
          <p>
	    Reported-by: José Valim</p>
          <p>
	    Own Id: OTP-11922</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The following native functions now bump an appropriate
	    amount of reductions and yield when out of
	    reductions:</p> <list>
	    <item><c>erlang:binary_to_list/1</c></item>
	    <item><c>erlang:binary_to_list/3</c></item>
	    <item><c>erlang:bitstring_to_list/1</c></item>
	    <item><c>erlang:list_to_binary/1</c></item>
	    <item><c>erlang:iolist_to_binary/1</c></item>
	    <item><c>erlang:list_to_bitstring/1</c></item>
	    <item><c>binary:list_to_bin/1</c></item> </list>
	    <p>Characteristics impact:</p> <taglist>
	    <tag>Performance</tag> <item>The functions converting
	    from lists got a performance loss for very small lists,
	    and a performance gain for very large lists.</item>
	    <tag>Priority</tag> <item>Previously a process executing
	    one of these functions effectively got an unfair priority
	    boost. This priority boost depended on the input size.
	    The larger the input was, the larger the priority boost
	    got. This unfair priority boost is now lost. </item>
	    </taglist>
          <p>
	    Own Id: OTP-11888</p>
        </item>
        <item>
          <p>
	    Add <c>maps:get/3</c> to maps module. The function will
	    return the supplied default value if the key does not
	    exist in the map.</p>
          <p>
	    Own Id: OTP-11951</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 2.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The option dupnames did not work as intended in re. When
	    looking for names with {capture, [Name, ...]}, re:run
	    returned a random instance of the match for that name,
	    instead of the leftmost matching instance, which was what
	    the documentation stated. This is now corrected to adhere
	    to the documentation. The option {capture,all_names}
	    along with a re:inspect/2 function is also added to
	    further help in using named subpatterns.</p>
          <p>
	    Own Id: OTP-11205</p>
        </item>
        <item>
          <p>
	    If option 'binary' was set for standard_input, then c:i()
	    would hang if the output was more than one page long -
	    i.e. then input after "(c)ontinue (q)uit --&gt;" could
	    not be read. This has been corrected. (Thanks to José
	    Valim)</p>
          <p>
	    Own Id: OTP-11589</p>
        </item>
        <item>
          <p>
	    stdlib/lists: Add function droplast/1 This functions
	    drops the last element of a non-empty list. lists:last/1
	    and lists:droplast/1 are the dual of hd/1 and tl/1 but
	    for the end of a list. (Thanks to Hans Svensson)</p>
          <p>
	    Own Id: OTP-11677</p>
        </item>
        <item>
          <p>
	    Allow all auto imports to be suppressed at once.
	    Introducing the no_auto_import attribute:
	    -compile(no_auto_import). Useful for code generation
	    tools that always use the qualified function names and
	    want to avoid the auto imported functions clashing with
	    local ones. (Thanks to José Valim.)</p>
          <p>
	    Own Id: OTP-11682</p>
        </item>
        <item>
          <p>
	    supervisor_bridge does no longer report normal
	    termination of children. The reason is that in some
	    cases, for instance when the restart strategy is
	    simple_one_for_one, the log could be completely
	    overloaded with reports about normally terminating
	    processes. (Thanks to Artem Ocheredko)</p>
          <p>
	    Own Id: OTP-11685</p>
        </item>
        <item>
	    <p> The type annotations for alternative registries using
	    the {via, Module, Name} syntax for sup_name() and
	    sup_ref() in the supervisor module are now consistent
	    with the documentation. Dialyzer should no longer
	    complain about valid supervisor:start_link() and
	    supervisor:start_child() calls. (Thanks to Caleb
	    Helbling.) </p>
          <p>
	    Own Id: OTP-11707</p>
        </item>
        <item>
	    <p> Two Dets bugs have been fixed. When trying to open a
	    short file that is not a Dets file, the file was deleted
	    even with just read access. Calling
	    <c>dets:is_dets_file/1</c> with a file that is not a Dets
	    file, a file descriptor was left open. (Thanks to Håkan
	    Mattsson for reporting the bugs.) </p>
          <p>
	    Own Id: OTP-11709</p>
        </item>
        <item>
          <p>
	    Fix race bug in <c>ets:all</c>. Concurrent creation of
	    tables could cause other tables to not be included in the
	    result. (Thanks to Florian Schintke for bug report)</p>
          <p>
	    Own Id: OTP-11726</p>
        </item>
        <item>
          <p>
	    erl_eval now properly evaluates '=='/2 when it is used in
	    guards. (Thanks to José Valim)</p>
          <p>
	    Own Id: OTP-11747</p>
        </item>
        <item>
          <p>
	    Calls to proplists:get_value/3 are replaced by the faster
	    lists:keyfind/3 in io_lib_pretty. Elements in the list
	    are always 2-tuples. (Thanks to Andrew Thompson)</p>
          <p>
	    Own Id: OTP-11752</p>
        </item>
        <item>
	    <p> A qlc bug where filters were erroneously optimized
	    away has been fixed. Thanks to Sam Bobroff for reporting
	    the bug. </p>
          <p>
	    Own Id: OTP-11758</p>
        </item>
        <item>
          <p>
	    A number of compiler errors where unusual or nonsensical
	    code would crash the compiler have been reported by Ulf
	    Norell and corrected by Anthony Ramine.</p>
          <p>
	    Own Id: OTP-11770</p>
        </item>
        <item>
	    <p> Since Erlang/OTP R16B the Erlang Core Linter
	    (<c>erl_lint</c>) has not emitted errors when built-in
	    types were re-defined. This bug has been fixed. (Thanks
	    to Roberto Aloi.) </p>
          <p>
	    Own Id: OTP-11772</p>
        </item>
        <item>
          <p>
	    The functions <c>sys:get_state/1,2</c> and
	    <c>sys:replace_state/2,3</c> are fixed so they can now be
	    run while the process is sys suspended. To accomplish
	    this, the new callbacks <c>Mod:system_get_state/1</c> and
	    <c>Mod:system_replace_state/2</c> are added, which are
	    also implemented by the generic behaviours
	    <c>gen_server</c>, <c>gen_event</c> and <c>gen_fsm</c>.</p>
          <p>
	    The potential incompatibility refers to:</p>
	    <list> <item>The previous behaviour of intercepting the
	    system message and passing a tuple of size 2 as the last
	    argument to <c>sys:handle_system_msg/6</c> is no longer
	    supported.</item> <item>The error handling when
	    <c>StateFun</c> in <c>sys:replace_state/2,3</c> fails is
	    changed from being totally silent to possibly (if the
	    callback module does not catch) throw an exception in the
	    client process.</item> </list>
          <p>
	    (Thanks to James Fish and Steve Vinoski)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-11817</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Options to set match_limit and match_limit_recursion are
	    added to re:run. The option report_errors is also added
	    to get more information when re:run fails due to limits
	    or compilation errors.</p>
          <p>
	    Own Id: OTP-10285</p>
        </item>
        <item>
	    <p> The pre-defined types <c>array/0</c>, <c>dict/0</c>,
	    <c>digraph/0</c>, <c>gb_set/0</c>, <c>gb_tree/0</c>,
	    <c>queue/0</c>, <c>set/0</c>, and <c>tid/0</c> have been
	    deprecated. They will be removed in Erlang/OTP 18.0. </p>
	    <p> Instead the types <c>array:array/0</c>,
	    <c>dict:dict/0</c>, <c>digraph:graph/0</c>,
	    <c>gb_set:set/0</c>, <c>gb_tree:tree/0</c>,
	    <c>queue:queue/0</c>, <c>sets:set/0</c>, and
	    <c>ets:tid/0</c> can be used. (Note: it has always been
	    necessary to use <c>ets:tid/0</c>.) </p> <p> It is
	    allowed in Erlang/OTP 17.0 to locally re-define the types
	    <c>array/0</c>, <c>dict/0</c>, and so on. </p> <p> New
	    types <c>array:array/1</c>, <c>dict:dict/2</c>,
	    <c>gb_sets:set/1</c>, <c>gb_trees:tree/2</c>,
	    <c>queue:queue/1</c>, and <c>sets:set/1</c> have been
	    added. </p> <p> A compiler option,
	    <c>nowarn_deprecated_type</c>, has been introduced. By
	    including the attribute </p> <c>
	    -compile(nowarn_deprecated_type).</c> <p> in an Erlang
	    source file, warnings about deprecated types can be
	    avoided in Erlang/OTP 17.0. </p> <p> The option can also
	    be given as a compiler flag: </p> <c> erlc
	    +nowarn_deprecated_type file.erl</c>
          <p>
	    Own Id: OTP-10342</p>
        </item>
        <item>
          <p>
	    Calls to erlang:open_port/2 with 'spawn' are updated to
	    handle space in the command path.</p>
          <p>
	    Own Id: OTP-10842</p>
        </item>
        <item>
	    <p> Dialyzer's <c>unmatched_return</c> warnings have been
	    corrected. </p>
          <p>
	    Own Id: OTP-10908</p>
        </item>
        <item>
          <p>
	    Forbid unsized fields in patterns of binary generators
	    and simplified v3_core's translation of bit string
	    generators. (Thanks to Anthony Ramine.)</p>
          <p>
	    Own Id: OTP-11186</p>
        </item>
        <item>
          <p>
	    The version of the PCRE library Used by Erlang's re
	    module is raised to 8.33 from 7.6. This means, among
	    other things, better Unicode and Unicode Character
	    Properties support. New options connected to PCRE 8.33
	    are also added to the re module (ucd, notempty_atstart,
	    no_start_optimize). PCRE has extended the regular
	    expression syntax between 7.6 and 8.33, why this imposes
	    a potential incompatibility. Only very complicated
	    regular expressions may be affected, but if you know you
	    are using obscure features, please test run your regular
	    expressions and verify that their behavior has not
	    changed.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-11204</p>
        </item>
        <item>
          <p>
	    Added dict:is_empty/1 and orddict:is_empty/1. (Thanks to
	    Magnus Henoch.)</p>
          <p>
	    Own Id: OTP-11353</p>
        </item>
        <item>
          <p>
	    A call to either the <c>garbage_collect/1</c> BIF or the
	    <c>check_process_code/2</c> BIF may trigger garbage
	    collection of another processes than the process calling
	    the BIF. The previous implementations performed these
	    kinds of garbage collections without considering the
	    internal state of the process being garbage collected. In
	    order to be able to more easily and more efficiently
	    implement yielding native code, these types of garbage
	    collections have been rewritten. A garbage collection
	    like this is now triggered by an asynchronous request
	    signal, the actual garbage collection is performed by the
	    process being garbage collected itself, and finalized by
	    a reply signal to the process issuing the request. Using
	    this approach processes can disable garbage collection
	    and yield without having to set up the heap in a state
	    that can be garbage collected.</p>
          <p>
	    The <seealso
	    marker="erts:erlang#garbage_collect/2"><c>garbage_collect/2</c></seealso>,
	    and <seealso
	    marker="erts:erlang#check_process_code/3"><c>check_process_code/3</c></seealso>
	    BIFs have been introduced. Both taking an option list as
	    last argument. Using these, one can issue asynchronous
	    requests.</p>
          <p>
	    <c>code:purge/1</c> and <c>code:soft_purge/1</c> have
	    been rewritten to utilize asynchronous
	    <c>check_process_code</c> requests in order to
	    parallelize work.</p>
          <p>
	    Characteristics impact: A call to the
	    <c>garbage_collect/1</c> BIF or the
	    <c>check_process_code/2</c> BIF will normally take longer
	    time to complete while the system as a whole wont be as
	    much negatively effected by the operation as before. A
	    call to <c>code:purge/1</c> and <c>code:soft_purge/1</c>
	    may complete faster or slower depending on the state of
	    the system while the system as a whole wont be as much
	    negatively effected by the operation as before.</p>
          <p>
	    Own Id: OTP-11388 Aux Id: OTP-11535, OTP-11648 </p>
        </item>
        <item>
	    <p> Improve the documentation of the supervisor's
	    <c>via</c> reference. (Thanks to MaximMinin.) </p>
          <p>
	    Own Id: OTP-11399</p>
        </item>
        <item>
	    <p><c>orddict:from_list/1</c> now uses the optimized sort
	    routines in the <c>lists</c> module instead of
	    (essentially) an insertion sort. Depending on the input
	    data, the speed of the new <c>from_list/1</c> is anything
	    from slightly faster up to several orders of magnitude
	    faster than the old <c>from_list/1</c>.</p> (Thanks to
	    Steve Vinoski.)
          <p>
	    Own Id: OTP-11552</p>
        </item>
        <item>
          <p>
	    EEP43: New data type - Maps</p>
          <p>
	    With Maps you may for instance:</p>
          <taglist>
            <tag/> <item><c>M0 = #{ a =&gt; 1, b =&gt; 2}, % create
	      associations</c></item>
            <tag/><item><c>M1 = M0#{ a := 10 }, % update values</c></item>
            <tag/><item><c>M2 = M1#{ "hi" =&gt;
	      "hello"}, % add new associations</c></item>
            <tag/><item><c>#{ "hi" := V1, a := V2, b := V3} = M2.
               % match keys with values</c></item>
          </taglist>
        <p>
	    For information on how to use Maps please see Map Expressions in the
		<seealso marker="doc/reference_manual:expressions#map_expressions">
			Reference Manual</seealso>.</p>
          <p>
	    The current implementation is without the following
	    features:</p>
          <taglist>
            <tag/><item>No variable keys</item>
	    <tag/><item>No single value access</item>
            <tag/><item>No map comprehensions</item>
          </taglist>
          <p>
	    Note that Maps is <em>experimental</em> during OTP 17.0.</p>
          <p>
	    Own Id: OTP-11616</p>
        </item>
        <item>
          <p>
	    When tab completing the erlang shell now expands
	    zero-arity functions all the way to closing parenthesis,
	    unless there is another function with the same name and a
	    different arity. (Thanks to Pierre Fenoll.)</p>
          <p>
	    Own Id: OTP-11684</p>
        </item>
        <item>
	    <p> The Erlang Code Preprocessor (<c>epp</c>) could loop
	    when encountering a circular macro definition in an
	    included file. This bug has been fixed. </p> <p> Thanks
	    to Maruthavanan Subbarayan for reporting the bug, and to
	    Richard Carlsson for providing a bug fix. </p>
          <p>
	    Own Id: OTP-11728</p>
        </item>
        <item>
	    <p> The Erlang Code Linter (<c>erl_lint</c>) has since
	    Erlang/OTP R13B emitted warnings whenever any of the
	    types <c>arity()</c>, <c>bitstring()</c>,
	    <c>iodata()</c>, or <c>boolean()</c> were re-defined. Now
	    errors are emitted instead. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-11771</p>
        </item>
        <item>
	    <p> The <c>encoding</c> option of
	    <c>erl_parse:abstract/2</c> has been extended to include
	    <c>none</c> and a callback function (a predicate). </p>
          <p>
	    Own Id: OTP-11807</p>
        </item>
        <item>
          <p>
	    Export zip option types to allow referal from other
	    modules.</p>
          <p>
	    Thanks to Pierre Fenoll and Håkan Mattson</p>
          <p>
	    Own Id: OTP-11828</p>
        </item>
        <item>
          <p>
	    The module <c>pg</c> has been deprecated and will be
	    removed in Erlang/OTP 18.</p>
          <p>
	    Own Id: OTP-11840</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.19.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix typo in gen_server.erl. Thanks to Brian L. Troutwine.</p>
          <p>
	    Own Id: OTP-11398</p>
        </item>
        <item>
          <p>
	    Spec for atan2 should be atan2(Y, X), not atan2(X, Y).
	    Thanks to Ary Borenszweig.</p>
          <p>
	    Own Id: OTP-11465</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add XML marker for regexp syntax. Thanks to Håkan
	    Mattson.</p>
          <p>
	    Own Id: OTP-11442</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.19.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> The functions <c>dets:foldl/3</c>,
	    <c>dets:foldr/3</c>, and <c>dets:traverse/2</c> did not
	    release the table after having traversed the table to the
	    end. The bug was introduced in R16B. (Thanks to Manuel
	    Duran Aguete.) </p>
          <p>
	    Own Id: OTP-11245</p>
        </item>
        <item>
	    <p> If the <c>fun M:F/A</c> construct was used
	    erroneously the linter could crash. (Thanks to Mikhail
	    Sobolev.) </p>
          <p>
	    Own Id: OTP-11254</p>
        </item>
        <item>
	    <p> The specifications of <c>io_lib:fread/2,3</c> have
	    been corrected. (Thanks to Chris King and Kostis Sagonas
	    for pinpointing the bug.) </p>
          <p>
	    Own Id: OTP-11261</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Fixed type typo in gen_server.</p>
          <p>
	    Own Id: OTP-11200</p>
        </item>
        <item>
          <p>
	    Update type specs in filelib and io_prompt. Thanks to
	    Jose Valim.</p>
          <p>
	    Own Id: OTP-11208</p>
        </item>
        <item>
          <p>
	    Fix typo in abcast() function comment. Thanks to Johannes
	    Weissl.</p>
          <p>
	    Own Id: OTP-11219</p>
        </item>
        <item>
          <p>
	    Make edlin understand a few important control keys.
	    Thanks to Stefan Zegenhagen.</p>
          <p>
	    Own Id: OTP-11251</p>
        </item>
        <item>
          <p>
	    Export the edge/0 type from the digraph module. Thanks to
	    Alex Ronne Petersen.</p>
          <p>
	    Own Id: OTP-11266</p>
        </item>
        <item>
          <p>
	    Fix variable usage tracking in erl_lint and fixed unsafe
	    variable tracking in try expressions. Thanks to Anthony
	    Ramine.</p>
          <p>
	    Own Id: OTP-11268</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.19.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> The Erlang scanner no longer accepts floating point
	    numbers in the input string. </p>
          <p>
	    Own Id: OTP-10990</p>
        </item>
        <item>
          <p>
	    When converting a faulty binary to a list with
	    unicode:characters_to_list, the error return value could
	    contain a faulty "rest", i.e. the io_list of characters
	    that could not be converted was wrong. This happened only
	    if input was a sub binary and conversion was from utf8.
	    This is now corrected.</p>
          <p>
	    Own Id: OTP-11080</p>
        </item>
        <item>
	    <p>The type <c>hook_function()</c> has been corrected in
	    <c>erl_pp</c>, the Erlang Pretty Printer. </p>
	    <p>The printing of invalid forms, e.g. record field
	    types, has also been fixed. It has been broken since
	    R16B. </p>
	    <p> (Thanks to Tom&#225;&#353; Janou&#353;ek.) </p>
          <p>
	    Own Id: OTP-11100</p>
        </item>
        <item>
          <p>
	    Fix receive support in erl_eval with a BEAM module.
	    Thanks to Anthony Ramine.</p>
          <p>
	    Own Id: OTP-11137</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Delete obsolete note about simple-one-for-one supervisor.
	    Thanks to Magnus Henoch.</p>
          <p>
	    Own Id: OTP-10938</p>
        </item>
        <item>
	    <p> When selecting encoding of a script written in Erlang
	    (<c>escript</c>) the optional directive on the second
	    line is now recognized. </p>
          <p>
	    Own Id: OTP-10951</p>
        </item>
        <item>
	    <p> The function <c>erl_parse:abstract/2</c> has been
	    documented. </p>
          <p>
	    Own Id: OTP-10992</p>
        </item>
        <item>
          <p>
	    Integrate elliptic curve contribution from Andreas
	    Schultz </p>
          <p>
	    In order to be able to support elliptic curve cipher
	    suites in SSL/TLS, additions to handle elliptic curve
	    infrastructure has been added to public_key and crypto.</p>
          <p>
	    This also has resulted in a rewrite of the crypto API to
	    gain consistency and remove unnecessary overhead. All OTP
	    applications using crypto has been updated to use the new
	    API.</p>
          <p>
	    Impact: Elliptic curve cryptography (ECC) offers
	    equivalent security with smaller key sizes than other
	    public key algorithms. Smaller key sizes result in
	    savings for power, memory, bandwidth, and computational
	    cost that make ECC especially attractive for constrained
	    environments.</p>
          <p>
	    Own Id: OTP-11009</p>
        </item>
        <item>
          <p>
	    Added sys:get_state/1,2 and sys:replace_state/2,3. Thanks
	    to Steve Vinoski.</p>
          <p>
	    Own Id: OTP-11013</p>
        </item>
        <item>
          <p>
	    Optimizations to gen mechanism. Thanks to Loïc Hoguin.</p>
          <p>
	    Own Id: OTP-11025</p>
        </item>
        <item>
          <p>
	    Optimizations to gen.erl. Thanks to Loïc Hoguin.</p>
          <p>
	    Own Id: OTP-11035</p>
        </item>
        <item>
          <p>
	    Use erlang:demonitor(Ref, [flush]) where applicable.
	    Thanks to Loïc Hoguin.</p>
          <p>
	    Own Id: OTP-11039</p>
        </item>
        <item>
	    <p>Erlang source files with non-ASCII characters are now
	    encoded in UTF-8 (instead of latin1).</p>
          <p>
	    Own Id: OTP-11041 Aux Id: OTP-10907 </p>
        </item>
        <item>
          <p>
	    Fix rest_for_one and one_for_all restarting a child not
	    terminated. Thanks to James Fish.</p>
          <p>
	    Own Id: OTP-11042</p>
        </item>
        <item>
          <p>
	    Fix excessive CPU consumption of timer_server. Thanks to
	    Aliaksey Kandratsenka.</p>
          <p>
	    Own Id: OTP-11053</p>
        </item>
        <item>
          <p>
	    Rename and document lists:zf/2 as lists:filtermap/2.
	    Thanks to Anthony Ramine.</p>
          <p>
	    Own Id: OTP-11078</p>
        </item>
        <item>
          <p>
	    Fixed an inconsistent state in epp. Thanks to Anthony
	    Ramine</p>
          <p>
	    Own Id: OTP-11079</p>
        </item>
        <item>
          <p>
	    c:ls(File) will now print File, similar to ls(1) in Unix.
	    The error messages have also been improved. (Thanks to
	    Bengt Kleberg.)</p>
          <p>
	    Own Id: OTP-11108</p>
        </item>
        <item>
          <p>
	    Support callback attributes in erl_pp. Thanks to Anthony
	    Ramine.</p>
          <p>
	    Own Id: OTP-11140</p>
        </item>
        <item>
          <p>
	    Improve erl_lint performance. Thanks to José Valim.</p>
          <p>
	    Own Id: OTP-11143</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.19.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Bugs related to Unicode have been fixed in the
	    <c>erl_eval</c> module. </p>
          <p>
	    Own Id: OTP-10622 Aux Id: kunagi-351 [262] </p>
        </item>
        <item>
	    <p><c>filelib:wildcard("some/relative/path/*.beam",
	    Path)</c> would fail to match any file. That is,
	    filelib:wildcard/2 would not work if the first component
	    of the pattern did not contain any wildcard characters.
	    (A previous attempt to fix the problem in R15B02 seems to
	    have made matters worse.)</p>
	    <p>(Thanks to Samuel Rivas and Tuncer Ayaz.)</p>
	    <p>There is also an incompatible change to the
	    <c>Path</c> argument. It is no longer allowed to be a
	    binary.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10812</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The new STDLIB application variable
	    <c>shell_strings</c> can be used for determining how the
	    Erlang shell outputs lists of integers. The new function
	    <c>shell:strings/1</c> toggles the value of the variable.
	    </p> <p> The control sequence modifier <c>l</c> can be
	    used for turning off the string recognition of <c>~p</c>
	    and <c>~P</c>. </p>
          <p>
	    Own Id: OTP-10755</p>
        </item>
        <item>
	    <p> Miscellaneous updates due to Unicode support. </p>
          <p>
	    Own Id: OTP-10820</p>
        </item>
        <item>
	    <p> Extend <c>~ts</c> to handle binaries with characters
	    coded in ISO-latin-1 </p>
          <p>
	    Own Id: OTP-10836</p>
        </item>
        <item>
          <p>
	    The +pc flag to erl can be used to set the range of
	    characters considered printable. This affects how the
	    shell and io:format("~tp",...) functionality does
	    heuristic string detection. More can be read in STDLIB
	    users guide.</p>
          <p>
	    Own Id: OTP-10884</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.19</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Wildcards such as "some/path/*" passed to
	    <c>filelib:wildcard/2</c> would fail to match any file.
	    (Thanks to Samuel Rivas for reporting this bug.)</p>
          <p>
	    Own Id: OTP-6874 Aux Id: kunagi-190 [101] </p>
        </item>
        <item>
          <p>
	    Fixed error handling in proc_lib:start which could hang
	    if the spawned process died in init.</p>
          <p>
	    Own Id: OTP-9803 Aux Id: kunagi-209 [120] </p>
        </item>
        <item>
          <p>
	    Allow ** in filelib:wildcard</p>
          <p>
	    Two adjacent * used as a single pattern will match all
	    files and zero or more directories and subdirectories.
	    (Thanks to José Valim)</p>
          <p>
	    Own Id: OTP-10431</p>
        </item>
        <item>
          <p>
	    Add the \gN and \g{N} syntax for back references in
	    re:replace/3,4 to allow use with numeric replacement
	    strings. (Thanks to Vance Shipley)</p>
          <p>
	    Own Id: OTP-10455</p>
        </item>
        <item>
          <p>
	    Export ets:match_pattern/0 type (Thanks to Joseph Wayne
	    Norton)</p>
          <p>
	    Own Id: OTP-10472</p>
        </item>
        <item>
          <p>
	    Fix printing the empty binary at depth 1 with ~W (Thanks
	    to Andrew Thompson)</p>
          <p>
	    Own Id: OTP-10504</p>
        </item>
        <item>
	    <p> The type <c>ascii_string()</c> in the <c>base64</c>
	    module has been corrected. The type
	    <c>file:file_info()</c> has been cleaned up. The type
	    <c>file:fd()</c> has been made opaque in the
	    documentation. </p>
          <p>
	    Own Id: OTP-10624 Aux Id: kunagi-352 [263] </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Dets tables are no longer fixed while traversing with
	    a bound key (when only the objects with the right key are
	    matched). This optimization affects the functions
	    <c>match/2</c>, <c>match_object/2</c>, <c>select/2</c>,
	    <c>match_delete/2</c>, and <c>select_delete/2</c>. </p>
          <p>
	    Own Id: OTP-10097</p>
        </item>
        <item>
	    <p> Support for Unicode has been implemented. </p>
          <p>
	    Own Id: OTP-10302</p>
        </item>
        <item>
	    <p> The linter now warns for opaque types that are not
	    exported, as well as for under-specified opaque types.
	    </p>
          <p>
	    Own Id: OTP-10436</p>
        </item>
        <item>
	    <p> The type <c>file:name()</c> has been substituted for
	    the type <c>file:filename()</c> in the following
	    functions in the <c>filename</c> module:
	    <c>absname/2</c>, <c>absname_join/2</c>, <c>join/1,2</c>,
	    and <c>split/1</c>. </p>
          <p>
	    Own Id: OTP-10474</p>
        </item>
        <item>
          <p>
	    If a child process fails in its start function, then the
	    error reason was earlier only reported as an error report
	    from the error_handler, and supervisor:start_link would
	    only return <c>{error,shutdown}</c>. This has been
	    changed so the supervisor will now return
	    <c>{error,{shutdown,Reason}}</c>, where <c>Reason</c>
	    identifies the failing child and its error reason.
	    (Thanks to Tomas Pihl)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10490</p>
        </item>
        <item>
	    <p>Where necessary a comment stating encoding has been
	    added to Erlang files. The comment is meant to be removed
	    in Erlang/OTP R17B when UTF-8 becomes the default
	    encoding. </p>
          <p>
	    Own Id: OTP-10630</p>
        </item>
        <item>
	    <p> The contracts and types of the modules
	    <c>erl_scan</c> and <c>sys</c> have been corrected and
	    improved. (Thanks to Kostis Sagonas.) </p>
          <p>
	    Own Id: OTP-10658</p>
        </item>
        <item>
	    <p> The Erlang shell now skips the rest of the line when
	    it encounters an Erlang scanner error. </p>
          <p>
	    Own Id: OTP-10659</p>
        </item>
        <item>
          <p>
	    Clean up some specs in the proplists module. (Thanks to
	    Kostis Sagonas.)</p>
          <p>
	    Own Id: OTP-10663</p>
        </item>
        <item>
	    <p> Some examples overflowing the width of PDF pages have
	    been corrected. </p>
          <p>
	    Own Id: OTP-10665</p>
        </item>
        <item>
          <p>
	    Enable escript to accept emulator arguments when script
	    file has no shebang. Thanks to Magnus Henoch</p>
          <p>
	    Own Id: OTP-10691</p>
        </item>
        <item>
          <p>
	    Fix bug in queue:out/1, queue:out_r/1 that makes it
	    O(N^2) in worst case. Thanks to Aleksandr Erofeev.</p>
          <p>
	    Own Id: OTP-10722</p>
        </item>
        <item>
	    <p> There are new functions in the <c>epp</c> module
	    which read the character encoding from files. See
	    <c>epp(3)</c> for more information. </p>
          <p>
	    Own Id: OTP-10742 Aux Id: OTP-10302 </p>
        </item>
        <item>
	    <p> The functions in <c>io_lib</c> have been adjusted for
	    Unicode. The existing functions <c>write_string()</c> and
	    so on now take Unicode strings, while the old behavior
	    has been taken over by new functions
	    <c>write_latin1_string()</c> and so on. There are also
	    new functions to write Unicode strings as Latin-1
	    strings, mainly targetted towards the Erlang pretty
	    printer (<c>erl_pp</c>). </p>
          <p>
	    Own Id: OTP-10745 Aux Id: OTP-10302 </p>
        </item>
        <item>
	    <p> The new functions <c>proc_lib:format/2</c> and
	    <c>erl_parse:abstract/2</c> accept an encoding as second
	    argument. </p>
          <p>
	    Own Id: OTP-10749 Aux Id: OTP-10302 </p>
        </item>
        <item>
          <p>
	    Increased potential concurrency in ETS for
	    <c>write_concurrency</c> option. The number of internal
	    table locks has increased from 16 to 64. This makes it
	    four times less likely that two concurrent processes
	    writing to the same table would collide and thereby
	    serialized. The cost is an increased constant memory
	    footprint for tables using write_concurrency. The memory
	    consumption per inserted record is not affected. The
	    increased footprint can be particularly large if
	    <c>write_concurrency</c> is combined with
	    <c>read_concurrency</c>.</p>
          <p>
	    Own Id: OTP-10787</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.18.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Minor test updates</p>
          <p>
	    Own Id: OTP-10591</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.18.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fixed bug where if given an invalid drive letter on
	    windows ensure dir would go into an infinite loop.</p>
          <p>
	    Own Id: OTP-10104</p>
        </item>
        <item>
          <p>
	    Calls to gen_server:enter_loop/4 where ServerName has a
	    global scope and no timeout is given now works correctly.</p>
          <p>
	    Thanks to Sam Bobroff for reporting the issue.</p>
          <p>
	    Own Id: OTP-10130</p>
        </item>
        <item>
          <p>
	    fix escript/primary archive reloading</p>
          <p>
	    If the mtime of an escript/primary archive file changes
	    after being added to the code path, correctly reload the
	    archive and update the cache. (Thanks to Tuncer Ayaz)</p>
          <p>
	    Own Id: OTP-10151</p>
        </item>
        <item>
          <p>
	    Fix bug that in some cases could cause corrupted binaries
	    in ETS tables with <c>compressed</c> option.</p>
          <p>
	    Own Id: OTP-10182</p>
        </item>
        <item>
          <p>
	    Fix filename:nativename/1 on Win32</p>
          <p>
	    Don't choke on paths given as binary argument on Win32.
	    Thanks to Jan Klötzke</p>
          <p>
	    Own Id: OTP-10188</p>
        </item>
        <item>
          <p>
	    Fix bug in <c>ets:test_ms/2</c> that could cause emulator
	    crash when using <c>'$_'</c> in match spec.</p>
          <p>
	    Own Id: OTP-10190</p>
        </item>
        <item>
          <p>
	    Fix bug where zip archives wrongly have a first disk
	    number set to 1</p>
          <p>
	    Own Id: OTP-10223</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The message printed by the Erlang shell as an
	    explanation of the <c>badarith</c> error has been
	    corrected. (Thanks to Matthias Lang.) </p>
          <p>
	    Own Id: OTP-10054</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.18.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    References to <c>is_constant/1</c> (which was removed in
	    the R12 release) has been removed from documentation and
	    code.</p>
          <p>
	    Own Id: OTP-6454 Aux Id: seq10407 </p>
        </item>
        <item>
          <p>
	    Leave control back to gen_server during supervisor's
	    restart loop</p>
          <p>
	    When an attempt to restart a child failed, supervisor
	    would earlier keep the execution flow and try to restart
	    the child over and over again until it either succeeded
	    or the restart frequency limit was reached. If none of
	    these happened, supervisor would hang forever in this
	    loop.</p>
          <p>
	    This commit adds a timer of 0 ms where the control is
	    left back to the gen_server which implements the
	    supervisor. This way any incoming request to the
	    supervisor will be handled - which could help breaking
	    the infinite loop - e.g. shutdown request for the
	    supervisor or for the problematic child.</p>
          <p>
	    This introduces some incompatibilities in stdlib due to
	    new return values from supervisor:</p>
          <list>
	    <item>restart_child/2 can now return
	    {error,restarting}</item> <item>delete_child/2 can now
	    return {error,restarting}</item> <item>which_children/1
	    returns a list of {Id,Child,Type,Mods}, where Child, in
	    addition to the old pid() or 'undefined', now also can be
	    'restarting'.</item>
          </list>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9549</p>
        </item>
        <item>
          <p>
	    If a temporary child's start function returned 'ignore',
	    then the supervisor would keep it's child specification.
	    This has been corrected. Child specifications for
	    non-existing temporary children shall never be kept.</p>
          <p>
	    Own Id: OTP-9782 Aux Id: seq11964 </p>
        </item>
        <item>
	    <p> Use universal time as base in error logger</p>
          <p>
	    Previous conversion used the deprecated
	    calendar:local_time_to_universal_time/1 </p>
          <p>
	    Own Id: OTP-9854</p>
        </item>
        <item>
	    <p>Calling a guard test (such as is_list/1) from the
	    top-level in a guard, would cause a compiler crash if
	    there was a local definition with the same name.
	    Corrected to reject the program with an error
	    message.</p>
          <p>
	    Own Id: OTP-9866</p>
        </item>
        <item>
          <p>
	    Fix the type spec from the doc of binary:part/3 (Thanks
	    to Ricardo Catalinas Jiménez)</p>
          <p>
	    Own Id: OTP-9920</p>
        </item>
        <item>
          <p>
	    Correct spelling of registered (Thanks to Richard
	    Carlsson)</p>
          <p>
	    Own Id: OTP-9925</p>
        </item>
        <item>
          <p>
	    Put gb_trees documentation into alphabetical order
	    (Thanks to Aidan Hobson Sayers)</p>
          <p>
	    Own Id: OTP-9929</p>
        </item>
        <item>
          <p>
	    Fix bug in ETS with <c>compressed</c> option and
	    insertion of term containing large integers (>2G) on
	    64-bit machines. Seen to cause emulator crash. (Thanks to
	    Diego Llarrull for excellent bug report)</p>
          <p>
	    Own Id: OTP-9932</p>
        </item>
        <item>
          <p>
	    Add plugin support for alternative name lookup This patch
	    introduces a new way of locating a behaviour instance:
	    {via, Module, Name}. (Thanks to Ulf Wiger)</p>
          <p>
	    Own Id: OTP-9945</p>
        </item>
        <item>
	    <p> The function <c>digraph_utils:condensation/1</c> used
	    to create a digraph containing loops contradicting the
	    documentation which states that the created digraph is
	    free of cycles. This bug has been fixed. (Thanks to
	    Kostis Sagonas for finding the bug.) </p>
          <p>
	    Own Id: OTP-9953</p>
        </item>
        <item>
	    <p> When an escript ends now all printout to standard
	    output and standard error gets out on the terminal. This
	    bug has been corrected by changing the behaviour of
	    erlang:halt/0,1, which should fix the same problem for
	    other escript-like applications, i.e that data stored in
	    the output port driver buffers got lost when printing on
	    a TTY and exiting through erlang:halt/0,1. </p>
	    <p> The BIF:s erlang:halt/0,1 has gotten improved
	    semantics and there is a new BIF erlang:halt/2 to
	    accomplish something like the old semantics. See the
	    documentation. </p>
	    <p> Now erlang:halt/0 and erlang:halt/1 with an integer
	    argument will close all ports and allow all pending async
	    threads operations to finish before exiting the emulator.
	    Previously erlang:halt/0 and erlang:halt(0) would just
	    wait for pending async threads operations but not close
	    ports. And erlang:halt/1 with a non-zero integer argument
	    would not even wait for pending async threads operations.
	    </p>
	    <p> To roughly the old behaviour, to not wait for ports
	    and async threads operations when you exit the emulator,
	    you use erlang:halt/2 with an integer first argument and
	    an option list containing {flush,false} as the second
	    argument. Note that now is flushing not dependant of the
	    exit code, and you can not only flush async threads
	    operations which we deemed as a strange behaviour anyway.
	    </p>
	    <p>Also, erlang:halt/1,2 has gotten a new feature: If the
	    first argument is the atom 'abort' the emulator is
	    aborted producing a core dump, if the operating system so
	    allows. </p>
          <p>
	    Own Id: OTP-9985</p>
        </item>
        <item>
          <p>
	    Add escript win32 alternative invocation. escript can now
	    be started as both "escript.exe" and "escript" (Thanks to
	    Pierre Rouleau)</p>
          <p>
	    Own Id: OTP-9997</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.18</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Improved algorithm in module <c>random</c>. Avoid seed
	    values that are even divisors of the primes and by that
	    prevent getting sub-seeds that are stuck on zero. Worst
	    case was random:seed(0,0,0) that produced a series of
	    only zeros. This is an incompatible change in the sense
	    that applications that relies on reproducing a specific
	    series for a given seed will fail. The pseudo random
	    output is still deterministic but different compared to
	    earlier versions.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8713</p>
        </item>
        <item>
	    <p> Calls to <c>global:whereis_name/1</c> have been
	    substituted for calls to
	    <c>global:safe_whereis_name/1</c> since the latter is not
	    safe at all.</p>
	    <p>The reason for not doing this earlier is that setting
	    a global lock masked out a bug concerning the restart of
	    supervised children. The bug has now been fixed by a
	    modification of <c>global:whereis_name/1</c>. (Thanks to
	    Ulf Wiger for code contribution.)</p>
	    <p>A minor race conditions in <c>gen_fsm:start*</c> has
	    been fixed: if one of these functions returned <c>{error,
	    Reason}</c> or ignore, the name could still be registered
	    (either locally or in <c>global</c>. (This is the same
	    modification as was done for gen_server in OTP-7669.)</p>
	    <p>The undocumented function
	    <c>global:safe_whereis_name/1</c> has been removed. </p>
          <p>
	    Own Id: OTP-9212 Aux Id: seq7117, OTP-4174 </p>
        </item>
        <item>
          <p>
	    If a child of a supervisor terminates with reason
	    {shutdown,Term} it is now handled by the supervisor as if
	    the reason was 'shutdown'. </p>
          <p>
	    For children with restart type 'permanent', this implies
	    no change. For children with restart type 'transient',
	    the child will no longer be restarted and no supervisor
	    report will be written. For children with restart type
	    'temporary', no supervisor report will be written.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9222</p>
        </item>
        <item>
          <p>
	    Minor improvement of documentation regarding supervisor
	    restart strategy for temporary and transient child
	    processes.</p>
          <p>
	    Own Id: OTP-9381</p>
        </item>
        <item>
	    <p>A Dets table with sufficiently large buckets could not
	    always be repaired. This bug has been fixed. </p> <p>The
	    format of Dets files has been modified. When downgrading
	    tables created with the new system will be repaired.
	    Otherwise the modification should not be noticeable. </p>
          <p>
	    Own Id: OTP-9607</p>
        </item>
        <item>
	    <p> A few contracts in the <c>lists</c> module have been
	    corrected. </p>
          <p>
	    Own Id: OTP-9616</p>
        </item>
        <item>
          <p>
	    Add '-callback' attributes in stdlib's behaviours</p>
          <p>
	    Replace the behaviour_info(callbacks) export in stdlib's
	    behaviours with -callback' attributes for all the
	    callbacks. Update the documentation with information on
	    the callback attribute Automatically generate
	    'behaviour_info' function from '-callback' attributes</p>
          <p>
	    'behaviour_info(callbacks)' is a special function that is
	    defined in a module which describes a behaviour and
	    returns a list of its callbacks.</p>
          <p>
	    This function is now automatically generated using the
	    '-callback' specs. An error is returned by lint if user
	    defines both '-callback' attributes and the
	    behaviour_info/1 function. If no type info is needed for
	    a callback use a generic spec for it. Add '-callback'
	    attribute to language syntax</p>
          <p>
	    Behaviours may define specs for their callbacks using the
	    familiar spec syntax, replacing the '-spec' keyword with
	    '-callback'. Simple lint checks are performed to ensure
	    that no callbacks are defined twice and all types
	    referred are declared.</p>
          <p>
	    These attributes can be then used by tools to provide
	    documentation to the behaviour or find discrepancies in
	    the callback definitions in the callback module.</p>
          <p>
	    Add callback specs into 'application' module in kernel
	    Add callback specs to tftp module following internet
	    documentation Add callback specs to inets_service module
	    following possibly deprecated comments</p>
          <p>
	    Own Id: OTP-9621</p>
        </item>
        <item>
	    <p> If a Dets table had been properly closed but the
	    space management data could not been read, it was not
	    possible to repair the file. This bug has been fixed.
	    </p>
          <p>
	    Own Id: OTP-9622</p>
        </item>
        <item>
          <p>
	    The Unicode noncharacter code points 16#FFFE and 16#FFFE
	    were not allowed to be encoded or decoded using the
	    <c>unicode</c> module or bit syntax. That was
	    inconsistent with the other noncharacters 16#FDD0 to
	    16#FDEF that could be encoded/decoded. To resolve the
	    inconsistency, 16#FFFE and 16#FFFE can now be encoded and
	    decoded. (Thanks to Alisdair Sullivan.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9624</p>
        </item>
        <item>
          <p>
	    Make epp search directory of current file first when
	    including another file This completes a partial fix in
	    R11 that only worked for include_lib(). (Thanks to
	    Richard Carlsson)</p>
          <p>
	    Own Id: OTP-9645</p>
        </item>
        <item>
          <p>
	    ms_transform: Fix incorrect `variable shadowed' warnings</p>
          <p>
	    This patch removes incorrect passing of variable bindings
	    from one function clause to another. (Thanks to Haitao
	    Li)</p>
          <p>
	    Own Id: OTP-9646</p>
        </item>
        <item>
          <p>
	    Explicitly kill dynamic children in supervisors</p>
          <p>
	    According to the supervisor's documentation: "Important
	    note on simple-one-for-one supervisors: The dynamically
	    created child processes of a simple-one-for-one
	    supervisor are not explicitly killed, regardless of
	    shutdown strategy, but are expected to terminate when the
	    supervisor does (that is, when an exit signal from the
	    parent process is received)."</p>
          <p>
	    All is fine as long as we stop simple_one_for_one
	    supervisor manually. Dynamic children catch the exit
	    signal from the supervisor and leave. But, if this
	    happens when we stop an application, after the top
	    supervisor has stopped, the application master kills all
	    remaining processes associated to this application. So,
	    dynamic children that trap exit signals can be killed
	    during their cleanup (here we mean inside terminate/2).
	    This is unpredictable and highly time-dependent.</p>
          <p>
	    In this commit, supervisor module is patched to
	    explicitly terminate dynamic children accordingly to the
	    shutdown strategy.</p>
          <p>
	    NOTE: Order in which dynamic children are stopped is not
	    defined. In fact, this is "almost" done at the same time.</p>
          <p>
	    Stack errors when dynamic children are stopped</p>
          <p>
	    Because a simple_one_for_one supervisor can have many
	    workers, we stack errors during its shutdown to report
	    only one message for each encountered error type. Instead
	    of reporting the child's pid, we use the number of
	    concerned children. (Thanks to Christopher Faulet)</p>
          <p>
	    Own Id: OTP-9647</p>
        </item>
        <item>
          <p>
	    Allow an infinite timeout to shutdown worker processes</p>
          <p>
	    Now, in child specification, the shutdown value can also
	    be set to infinity for worker children. This restriction
	    was removed because this is not always possible to
	    predict the shutdown time for a worker. This is highly
	    application-dependent. Add a warning to docs about
	    workers' shutdown strategy (Thanks to Christopher Faulet)</p>
          <p>
	    Own Id: OTP-9648</p>
        </item>
        <item>
          <p>
	    A badarg would sometimes occur in supervisor when
	    printing error reports and the child pid was undefined.
	    This has been corrected.</p>
          <p>
	    Own Id: OTP-9669</p>
        </item>
        <item>
          <p>
	    Fix re:split spec not to accept option 'global'(Thanks to
	    Shunichi Shinohara)</p>
          <p>
	    Own Id: OTP-9691</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Fix a few tests that used to fail on the HiPE
	    platform. </p>
          <p>
	    Own Id: OTP-9637</p>
        </item>
        <item>
	    <p>Variables are now now allowed in '<c>fun M:F/A</c>' as
	    suggested by Richard O'Keefe in EEP-23.</p>
	    <p>The representation of '<c>fun M:F/A</c>' in the
	    abstract format has been changed in an incompatible way.
	    Tools that directly read or manipulate the abstract
	    format (such as parse transforms) may need to be updated.
	    The compiler can handle both the new and the old format
	    (i.e. extracting the abstract format from a pre-R15 BEAM
	    file and compiling it using compile:forms/1,2 will work).
	    The <c>syntax_tools</c> application can also handle both
	    formats.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9643</p>
        </item>
        <item>
          <p>
	    Tuple funs (a two-element tuple with a module name and a
	    function) are now officially deprecated and will be
	    removed in R16. Use '<c>fun M:F/A</c>' instead. To make
	    you aware that your system uses tuple funs, the very
	    first time a tuple fun is applied, a warning will be sent
	    to the error logger.</p>
          <p>
	    Own Id: OTP-9649</p>
        </item>
        <item>
          <p>
	    The deprecated '<c>regexp</c>' module has been removed.
	    Use the '<c>re</c>' module instead.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9737</p>
        </item>
        <item>
          <p>
	    <c>filename:find_src/1,2</c> will now work on stripped
	    BEAM files (reported by Per Hedeland). The HiPE compiler
	    will also work on stripped BEAM files. The BEAM compiler
	    will no longer include compilation options given in the
	    source code itself in <c>M:module_info(compile)</c>
	    (because those options will be applied anyway if the
	    module is re-compiled).</p>
          <p>
	    Own Id: OTP-9752</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    erl_tar:extract failed when executed inside a directory
	    with some parent directory to which the user has no read
	    access. This has been corrected.</p>
          <p>
	    Own Id: OTP-9368</p>
        </item>
        <item>
	    <p> A bug in <c>erl_scan:set_attribute/3</c> has been
	    fixed. </p>
          <p>
	    Own Id: OTP-9412</p>
        </item>
        <item>
	    <p> The contract of <c>io_lib:fread()</c> has been
	    corrected. </p>
          <p>
	    Own Id: OTP-9413 Aux Id: seq11873 </p>
        </item>
        <item>
          <p>
	    A crash in io_lib:fread/2 when end of input data was
	    encountered while trying to match literal characters,
	    which should return {more,_,_,_} but instead crashed, has
	    been corrected. Reported by Klas Johansson.</p>
          <p>
	    A similar peculiarity for io:fread when encountering end
	    of file before any field data has also been corrected.</p>
          <p>
	    Own Id: OTP-9439</p>
        </item>
        <item>
	    <p> The contract of <c>timer:now_diff()</c> has been
	    corrected. (Thanks to Alex Morarash). </p>
          <p>
	    Own Id: OTP-9450</p>
        </item>
        <item>
          <p>
	    Fix minor typo in gen_fsm documentation (Thanks to Haitao
	    Li)</p>
          <p>
	    Own Id: OTP-9456</p>
        </item>
        <item>
	    <p>The contracts of <c>zip:zip_list_dir/1</c> and
	    <c>zip:zip_get/2</c> have been corrected. </p>
          <p>
	    Own Id: OTP-9471 Aux Id: seq11887, OTP-9472 </p>
        </item>
        <item>
	    <p> A bug in <c>zip:zip_open()</c> has been fixed. </p>
          <p>
	    Own Id: OTP-9472 Aux Id: seq11887, OTP-9471 </p>
        </item>
        <item>
          <p>
	    Fix trivial documentation errors(Thanks to Matthias Lang)</p>
          <p>
	    Own Id: OTP-9498</p>
        </item>
        <item>
          <p>
	    Add a proplist() type</p>
          <p>
	    Recently I was adding specs to an API and found that
	    there is no canonical proplist() type defined. (Thanks to
	    Ryan Zezeski)</p>
          <p>
	    Own Id: OTP-9499</p>
        </item>
        <item>
          <p>
	    fix supervisors restarting temporary children</p>
          <p>
	    In the current implementation of supervisors, temporary
	    children should never be restarted. However, when a
	    temporary child is restarted as part of a one_for_all or
	    rest_for_one strategy where the failing process is not
	    the temporary child, the supervisor still tries to
	    restart it.</p>
          <p>
	    Because the supervisor doesn't keep some of the MFA
	    information of temporary children, this causes the
	    supervisor to hit its restart limit and crash.</p>
          <p>
	    This patch fixes the behaviour by inserting a clause in
	    terminate_children/2-3 (private function) that will omit
	    temporary children when building a list of killed
	    processes, to avoid having the supervisor trying to
	    restart them again.</p>
          <p>
	    Only supervisors in need of restarting children used the
	    list, so the change should be of no impact for the
	    functions that called terminate_children/2-3 only to kill
	    all children.</p>
          <p>
	    The documentation has been modified to make this
	    behaviour more explicit. (Thanks to Fred Hebert)</p>
          <p>
	    Own Id: OTP-9502</p>
        </item>
        <item>
          <p>
	    fix broken edoc annotations (Thanks to Richard Carlsson)</p>
          <p>
	    Own Id: OTP-9516</p>
        </item>
        <item>
	    <p> XML files have been corrected. </p>
          <p>
	    Own Id: OTP-9550 Aux Id: OTP-9541 </p>
        </item>
        <item>
          <p>
	    Handle rare race in the crypto key server functionality</p>
          <p>
	    Own Id: OTP-9586</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Types and specifications have been added. </p>
          <p>
	    Own Id: OTP-9356</p>
        </item>
        <item>
	    <p> The contracts of the <c>queue</c> module have been
	    modified. </p>
          <p>
	    Own Id: OTP-9418</p>
        </item>
        <item>
	    <p> Contracts in STDLIB and Kernel have been improved and
	    type errors have been corrected. </p>
          <p>
	    Own Id: OTP-9485</p>
        </item>
        <item>
          <p>
	    Types for several BIFs have been extended/corrected. Also
	    the types for types for <c>lists:keyfind/3</c>,
	    <c>lists:keysearch/3</c>, and <c>lists:keyemember/3</c>
	    have been corrected. The incorrect/incomplete types could
	    cause false dialyzer warnings.</p>
          <p>
	    Own Id: OTP-9496</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> The default value <c>undefined</c> was added to
	    records field types in such a way that the result was not
	    always a well-formed type. This bug has been fixed. </p>
          <p>
	    Own Id: OTP-9147</p>
        </item>
        <item>
          <p>
	    Update index file atomically</p>
          <p>
	    Since the log_mf_h index file might be read by other
	    processes than the error handler (e.g. by the rb tool),
	    this file should be updated atomically. This will avoid
	    hitting the time gap between opening the file in write
	    mode (and thus emptying the file) and the actual update
	    with the new contents. To do this, a temporary file is
	    written, and the file:rename/1 used to replace the real
	    index file.</p>
          <p>
	    Own Id: OTP-9148</p>
        </item>
        <item>
          <p>
	    Fixed various typos across the documentation (Thanks to
	    Tuncer Ayaz)</p>
          <p>
	    Own Id: OTP-9154</p>
        </item>
        <item>
          <p>
	    Supervisors should not save child-specs for temporary
	    processes when they terminate as they should not be
	    restarted. Saving the temporary child spec will result in
	    that you can not start a new temporary process with the
	    same child spec as an already terminated temporary
	    process. Since R14B02 you can not restart a temporary
	    temporary process as arguments are no longer saved, it
	    has however always been semantically incorrect to restart
	    a temporary process. Thanks to Filipe David Manana for
	    reporting this and suggesting a solution.</p>
          <p>
	    Own Id: OTP-9167 Aux Id: OTP-9064 </p>
        </item>
        <item>
          <p>
	    Various small documentation fixes (Thanks to Bernard
	    Duggan)</p>
          <p>
	    Own Id: OTP-9172</p>
        </item>
        <item>
          <p>
	    Fix format_status bug for unregistered gen_event
	    processes</p>
          <p>
	    Port the gen_fsm code for format_status to gen_event in
	    order to prevent a lists:concat([...,pid()]) crash when
	    calling sys:get_status/1 on an unregistered gen_event
	    process.</p>
          <p>
	    Refactor format_status header code from gen_* behaviours
	    to module gen.</p>
          <p>
	    Extend the format_status tests in gen_event_SUITE to
	    cover format_status bugs with anonymous gen_event
	    processes. (Thanks To Geoff Cant)</p>
          <p>
	    Own Id: OTP-9218</p>
        </item>
        <item>
          <p>
	    List of pids changed to 'set' in supervisor for dynamic
	    temporary children. Accessing the list would not scale
	    well when adding/deleting many children. (Thanks to
	    Evgeniy Khramtsov)</p>
          <p>
	    Own Id: OTP-9242</p>
        </item>
        <item>
          <p>
	    Change pool module to attempt to attach to nodes that are
	    already running</p>
          <p>
	    The pool module prints out an error message and takes no
	    further action for nodes that are already running. This
	    patch changes that behavior so that if the return from
	    slave:start/3 is {already_running, Node} then an attempt
	    to attach to the node is still made. This makes sense
	    because the node has been specified by the user in the
	    .hosts.erlang file indicating a wish for the node to be
	    part of the pool and a manual attach can be successfully
	    made after the pool is started.(Thanks to Kelly
	    McLaughlin)</p>
          <p>
	    Own Id: OTP-9244</p>
        </item>
        <item>
          <p>
	    unicode: document 16#FFFE and 16#FFFF (non chars)(Thanks
	    to Tuncer Ayaz)</p>
          <p>
	    Own Id: OTP-9256</p>
        </item>
        <item>
          <p>
	    re: remove gratuitous "it " in manpage (Thanks to Tuncer
	    Ayaz)</p>
          <p>
	    Own Id: OTP-9307</p>
        </item>
        <item>
	    <p> A bug in erl_eval(3) has been fixed. </p>
          <p>
	    Own Id: OTP-9322</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add <c>timer:tc/1</c> and remove the catch in <c>tc/2</c>
	    and <c>tc/3</c>. The time measuring functions will thus
	    no longer trap exits, errors or throws caused by the
	    measured function.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9169</p>
        </item>
        <item>
          <p>
	    Allow supervisor:terminate_child(SupRef,Pid) for
	    simple_one_for_one supervisors</p>
          <p>
	    supervisor:terminate_child/2 was earlier not allowed if
	    the supervisor used restart strategy simple_one_for_one.
	    This is now changed so that children of this type of
	    supervisors can be terminated by specifying the child's
	    Pid.</p>
          <p>
	    (Thanks to Vance Shipley.)</p>
          <p>
	    Own Id: OTP-9201</p>
        </item>
        <item>
	    <p> Types and specifications have been added. </p>
          <p>
	    Own Id: OTP-9267</p>
        </item>
        <item>
	    <p> Erlang types and specifications are used for
	    documentation. </p>
          <p>
	    Own Id: OTP-9271</p>
        </item>
        <item>
	    <p>Allow Dets tablenames to be arbitrary terms.</p>
          <p>
	    Own Id: OTP-9282</p>
        </item>
        <item>
	    <p> A specification that could cause problems for
	    Dialyzer has been fixed. An opaque type in erl_eval has
	    been turned in to a ordinary type. This is a temporary
	    fix. </p>
          <p>
	    Own Id: OTP-9333</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Two bugs in io:format for ~F.~Ps has been corrected. When
	    length(S) >= abs(F) > P, the precision P was incorrectly
	    ignored. When F == P > length(S) the result was
	    incorrectly left adjusted. Bug found by Ali Yakout who
	    also provided a fix.</p>
          <p>
	    Own Id: OTP-8989 Aux Id: seq11741 </p>
        </item>
        <item>
	    <p>Fix exception generation in the io module</p>
          <p>
	    Some functions did not generate correct badarg exception
	    on a badarg exception.</p>
          <p>
	    Own Id: OTP-9045</p>
        </item>
        <item>
          <p>
	    Fixes to the dict and orddict module documentation</p>
          <p>
	    Fixed grammar and one inconsistency (Key - Value instead
	    of key/value, since everywhere else the former is used).
	    (thanks to Filipe David Manana)</p>
          <p>
	    Own Id: OTP-9083</p>
        </item>
        <item>
          <p>
	    Add ISO week number calculation functions to the calendar
	    module in stdlib</p>
          <p>
	    This new feature adds the missing week number function to
	    the calendar module of the stdlib application. The
	    implementation conforms to the ISO 8601 standard. The new
	    feature has been implemented tested and documented
	    (thanks to Imre Horvath).</p>
          <p>
	    Own Id: OTP-9087</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Implement the 'MAY' clauses from RFC4648 regarding the
	    pad character to make mime_decode() and
	    mime_decode_to_string() functions more tolerant of badly
	    padded base64. The RFC is quoted below for easy
	    reference.</p>
          <p>
	    "RFC4648 Section 3.3 with reference to MIME decoding:
	    Furthermore, such specifications MAY ignore the pad
	    character, "=", treating it as non-alphabet data, if it
	    is present before the end of the encoded data. If more
	    than the allowed number of pad characters is found at the
	    end of the string (e.g., a base 64 string terminated with
	    "==="), the excess pad characters MAY also be ignored."</p>
          <p>
	    Own Id: OTP-9020</p>
        </item>
        <item>
          <p>
	    Supervisors will no longer save start parameters for
	    temporary processes as they will not be restarted. In the
	    case of simple_one_for_one workers such as ssl-connection
	    processes this will substantial reduce the memory
	    footprint of the supervisor.</p>
          <p>
	    Own Id: OTP-9064</p>
        </item>
        <item>
          <p>
	    When running escript it is now possible to add the -n
	    flag and the escript will be compiled using +native.</p>
          <p>
	    Own Id: OTP-9076</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.2.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Several type specifications for standard libraries were
	    wrong in the R14B01 release. This is now corrected. The
	    corrections concern types in re,io,filename and the
	    module erlang itself.</p>
          <p>
	    Own Id: OTP-9008</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> When several clients accessed a Dets table
	    simultaneously, one of them calling
	    <c>dets:insert_new/2</c>, the Dets server could crash.
	    Alternatively, under the same conditions, <c>ok</c> was
	    sometimes returned instead of <c>true</c>. (Thanks to
	    John Hughes.) </p>
          <p>
	    Own Id: OTP-8856</p>
        </item>
        <item>
	    <p> When several clients accessed a Dets table
	    simultaneously, inserted or updated objects were
	    sometimes lost due to the Dets file being truncated.
	    (Thanks to John Hughes.) </p>
          <p>
	    Own Id: OTP-8898</p>
        </item>
        <item>
	    <p> When several clients accessed a Dets table
	    simultaneously, modifications of the Dets server's
	    internal state were sometimes thrown away. The symptoms
	    are diverse: error with reason <c>bad_object</c>;
	    inserted objects not returned by <c>lookup()</c>; et
	    cetera. (Thanks to John Hughes.) </p>
          <p>
	    Own Id: OTP-8899</p>
        </item>
        <item>
	    <p> If a Dets table was closed after calling
	    <c>bchunk/2</c>, <c>match/1,3</c>,
	    <c>match_object/1,3</c>, or <c>select/1,3</c> and then
	    opened again, a subsequent call using the returned
	    continuation would normally return a reply. This bug has
	    fixed; now the call fails with reason <c>badarg</c>. </p>
          <p>
	    Own Id: OTP-8903</p>
        </item>
        <item>
	    <p> Cover did not collect coverage data for files such as
	    Yecc parses containing include directives. The bug has
	    been fixed by modifying <c>epp</c>, the Erlang Code
	    Preprocessor. </p>
          <p>
	    Own Id: OTP-8911</p>
        </item>
        <item>
	    <p> If a Dets table with fewer slots than keys was opened
	    and then closed after just a lookup, the contents were no
	    longer well-formed. This bug has been fixed. (Thanks to
	    Matthew Evans.) </p>
          <p>
	    Own Id: OTP-8923</p>
        </item>
        <item>
          <p>
	    In a supervisor, when it terminates a child, if that
	    child happens to have exited fractionally early, with
	    normal, the supervisor reports this as an error. This
	    should not be reported as an error.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8938 Aux Id: seq11615 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The documentation filelib:wildcard/1,2 now describes the
	    character set syntax for wildcards.</p>
          <p>
	    Own Id: OTP-8879 Aux Id: seq11683 </p>
        </item>
        <item>
	    <p>Buffer overflows have been prevented in <c>erlc</c>,
	    <c>dialyzer</c>, <c>typer</c>, <c>run_test</c>,
	    <c>heart</c>, <c>escript</c>, and <c>erlexec</c>.</p>
	    (Thanks to Michael Santos.)
          <p>
	    Own Id: OTP-8892</p>
        </item>
        <item>
          <p>
	    Using a float for the number of copies for
	    <c>string:copies/2</c> resulted in an infinite loop. Now
	    it will fail with an exception instead. (Thanks to
	    Michael Santos.)</p>
          <p>
	    Own Id: OTP-8915</p>
        </item>
        <item>
          <p>
	    New ETS option <c>compressed</c>, to enable a more
	    compact storage format at the expence of heavier table
	    operations. For test and evaluation, <c>erl +ec</c> can
	    be used to force compression on all ETS tables.</p>
          <p>
	    Own Id: OTP-8922 Aux Id: seq11658 </p>
        </item>
        <item>
	    <p> The default maximum number of slots of a Dets table
	    has been changed as to be equal to the maximum number of
	    slots. (Thanks to Richard Carlsson.) </p>
          <p>
	    Own Id: OTP-8959</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>reference() has been substituted for ref() in the
	    documentation.</p>
          <p>
	    Own Id: OTP-8733</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The ms_transform now warns if the fun head shadows
	    surrounding variables (just like the warnings you would
	    get for an ordinary fun in the same context).</p>
          <p>
	    Own Id: OTP-6759</p>
        </item>
        <item>
          <p>
	    ets:select_reverse/{1,2,3} are now documented.</p>
          <p>
	    Own Id: OTP-7863</p>
        </item>
        <item>
          <p>
	    Large parts of the <c>ethread</c> library have been
	    rewritten. The <c>ethread</c> library is an Erlang
	    runtime system internal, portable thread library used by
	    the runtime system itself.</p>
          <p>
	    Most notable improvement is a reader optimized rwlock
	    implementation which dramatically improve the performance
	    of read-lock/read-unlock operations on multi processor
	    systems by avoiding ping-ponging of the rwlock cache
	    lines. The reader optimized rwlock implementation is used
	    by miscellaneous rwlocks in the runtime system that are
	    known to be read-locked frequently, and can be enabled on
	    ETS tables by passing the <seealso
	    marker="stdlib:ets#new_2_read_concurrency">{read_concurrency,
	    true}</seealso> option upon table creation. See the
	    documentation of <seealso
	    marker="stdlib:ets#new/2">ets:new/2</seealso> for more
	    information. The reader optimized rwlock implementation
	    can be fine tuned when starting the runtime system. For
	    more information, see the documentation of the <seealso
	    marker="erts:erl#+rg">+rg</seealso> command line argument
	    of <c>erl</c>.</p>
          <p>
	    There is also a new implementation of rwlocks that is not
	    optimized for readers. Both implementations interleaves
	    readers and writers during contention as opposed to,
	    e.g., the NPTL (Linux) pthread rwlock implementation
	    which use either a reader or writer preferred strategy.
	    The reader/writer preferred strategy is problematic since
	    it starves threads doing the non-preferred operation.</p>
          <p>
	    The new rwlock implementations in general performs better
	    in ERTS than common pthread implementations. However, in
	    some extremely heavily contended cases this is not the
	    case. Such heavy contention can more or less only appear
	    on ETS tables. This when multiple processes do very large
	    amounts of write locked operations simultaneously on the
	    same table. Such use of ETS is bad regardless of rwlock
	    implementation, will never scale, and is something we
	    strongly advise against.</p>
          <p>
	    The new rwlock implementations depend on atomic
	    operations. If no native atomic implementation is found,
	    a fallback solution will be used. Using the fallback
	    implies a performance degradation. That is, it is more
	    important now than before to build OTP with a native
	    atomic implementation.</p>
          <p>
	    The <c>ethread</c> library contains native atomic
	    implementations for, x86 (32 and 64 bit), powerpc (32
	    bit), sparc V9 (32 and 64 bit), and tilera (32 bit). On
	    other hardware gcc's builtin support for atomic memory
	    access will be used if such exists. If no such support is
	    found, <c>configure</c> will warn about no atomic
	    implementation available.</p>
          <p>
	    The <c>ethread</c> library can now also use the
	    <c>libatomic_ops</c> library for atomic memory accesses.
	    This makes it possible for the Erlang runtime system to
	    utilize optimized native atomic operations on more
	    platforms than before. If <c>configure</c> warns about no
	    atomic implementation available, try using the
	    <c>libatomic_ops</c> library. Use the <seealso
	    marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP">--with-libatomic_ops=PATH</seealso>
	    <c>configure</c> command line argument when specifying
	    where the <c>libatomic_ops</c> installation is located.
	    The <c>libatomic_ops</c> library can be downloaded from:
	    <url
	    href="http://www.hpl.hp.com/research/linux/atomic_ops/">http://www.hpl.hp.com/research/linux/atomic_ops/</url></p>
          <p>
	    The changed API of the <c>ethread</c> library has also
	    caused modifications in the Erlang runtime system.
	    Preparations for the to come "delayed deallocation"
	    feature has also been done since it depends on the
	    <c>ethread</c> library.</p>
          <p>
	    <em>Note</em>: When building for x86, the <c>ethread</c>
	    library will now use instructions that first appeared on
	    the pentium 4 processor. If you want the runtime system
	    to be compatible with older processors (back to 486) you
	    need to pass the <seealso
	    marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP">--enable-ethread-pre-pentium4-compatibility</seealso>
	    <c>configure</c> command line argument when configuring
	    the system.</p>
          <p>
	    Own Id: OTP-8544</p>
        </item>
        <item>
          <p>
	    Some Built In Functions (BIFs) from the module erlang was
	    never made autoimported for backward compatibility
	    reasons. As local functions now override autoimports, new
	    autoimports is no longer a problem, why the following
	    BIFs are finally made autoimported: monitor/2, monitor/3,
	    demonitor/2, demonitor/3, error/1, error/2,
	    integer_to_list/2, list_to_integer/2.</p>
          <p>
	    Own Id: OTP-8763</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.17</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The Erlang code preprocessor (<c>epp</c>) sent extra
	    messages on the form <c>{eof,Location}</c> to the client
	    when parsing the <c>file</c> attribute. This bug,
	    introduced in R11B, has been fixed.</p>
          <p>
	    Own Id: OTP-8470</p>
        </item>
        <item>
	    <p>The abstract type 'fun' could not be printed by the
	    Erlang pretty printer (<c>erl_pp</c>). This bug has been
	    fixed.</p>
          <p>
	    Own Id: OTP-8473</p>
        </item>
        <item>
	    <p>The function <c>erl_scan:reserved_word/1</c> no longer
	    returns <c>true</c> when given the word <c>spec</c>. This
	    bug was introduced in STDLIB-1.15.3 (R12B-3).</p>
          <p>
	    Own Id: OTP-8567</p>
        </item>
        <item>
	    <p>The documentation of <c>lists:keysort/2</c> states
	    that the sort is stable.</p>
          <p>
	    Own Id: OTP-8628 Aux Id: seq11576 </p>
        </item>
        <item>
          <p>
	    The shell's line editing has been improved to more
	    resemble the behaviour of readline and other shells.
	    (Thanks to Dave Peticolas)</p>
          <p>
	    Own Id: OTP-8635</p>
        </item>
        <item>
	    <p>The Erlang code preprocessor (<c>epp</c>) did not
	    correctly handle premature end-of-input when defining
	    macros. This bug, introduced in STDLIB 1.16, has been
	    fixed.</p>
          <p>
	    Own Id: OTP-8665 Aux Id: OTP-7810 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The module binary from EEP31 (and EEP9) is implemented.</p>
          <p>
	    Own Id: OTP-8217</p>
        </item>
        <item>
	    <p>The erlang pretty printer (<c>erl_pp</c>) no longer
	    quotes atoms in types.</p>
          <p>
	    Own Id: OTP-8501</p>
        </item>
        <item>
	    <p>The Erlang code preprocessor (<c>epp</c>) now
	    considers records with no fields as typed.</p>
          <p>
	    Own Id: OTP-8503</p>
        </item>
        <item>
          <p>
	    Added function <c>zip:foldl/3</c> to iterate over zip
	    archives.</p>
          <p>
	    Added functions to create and extract escripts. See
	    <c>escript:create/2</c> and <c>escript:extract/2</c>.</p>
          <p>
	    The undocumented function <c>escript:foldl/3</c> has been
	    removed. The same functionality can be achieved with the
	    more flexible functions <c>escript:extract/2</c> and
	    <c>zip:foldl/3</c>.</p>
          <p>
	    Record fields has been annotated with type info. Source
	    files as been adapted to fit within 80 chars and trailing
	    whitespace has been removed.</p>
          <p>
	    Own Id: OTP-8521</p>
        </item>
        <item>
	    <p>The Erlang parser no longer duplicates the singleton
	    type <c>undefined</c> in the type of record fields
	    without initial value.</p>
          <p>
	    Own Id: OTP-8522</p>
        </item>
        <item>
	    <p>A regular expression with many levels of parenthesis
	    could cause a buffer overflow. That has been corrected.
	    (Thanks to Michael Santos.)</p>
          <p>
	    Own Id: OTP-8539</p>
        </item>
        <item>
	    <p>When defining macros the closing right parenthesis
	    before the dot is now mandatory.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8562</p>
        </item>
        <item>
          <p>
	    Some properties of a compiled re pattern are defined to
	    allow for guard tests.</p>
          <p>
	    Own Id: OTP-8577</p>
        </item>
        <item>
	    <p>Local and imported functions now override the
	    auto-imported BIFs when the names clash. The pre R14
	    behaviour was that auto-imported BIFs would override
	    local functions. To avoid that old programs change
	    behaviour, the following will generate an error:</p>
	    <list><item><p>Doing a call without explicit module name
	    to a local function having a name clashing with the name
	    of an auto-imported BIF that was present (and
	    auto-imported) before OTP R14A</p></item>
	    <item><p>Explicitly importing a function having a name
	    clashing with the name of an autoimported BIF that was
	    present (and autoimported) before OTP R14A</p></item>
	    <item><p>Using any form of the old compiler directive
	    <c>nowarn_bif_clash</c></p></item> </list> <p>If the BIF
	    was added or auto-imported in OTP R14A or later,
	    overriding it with an import or a local function will
	    only result in a warning,</p> <p>To resolve clashes, you
	    can either use the explicit module name <c>erlang</c> to
	    call the BIF, or you can remove the auto-import of that
	    specific BIF by using the new compiler directive
	    <c>-compile({no_auto_import,[F/A]}).</c>, which makes all
	    calls to the local or imported function without explicit
	    module name pass without warnings or errors.</p> <p>The
	    change makes it possible to add auto-imported BIFs
	    without breaking or silently changing old code in the
	    future. However some current code ingeniously utilizing
	    the old behaviour or the <c>nowarn_bif_clash</c> compiler
	    directive, might need changing to be accepted by the
	    compiler.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8579</p>
        </item>
        <item>
	    <p>The undocumented, unsupport, and deprecated function
	    <c>lists:flat_length/1</c> has been removed.</p>
          <p>
	    Own Id: OTP-8584</p>
        </item>
        <item>
          <p>
	    A bug in re that could cause certain regular expression
	    matches never to terminate is corrected. (Thanks to
	    Michael Santos and Gordon Guthrie.)</p>
          <p>
	    Own Id: OTP-8589</p>
        </item>
        <item>
	    <p>Nested records can now be accessed without
	    parenthesis. See the Reference Manual for examples.
	    (Thanks to YAMASHINA Hio and Tuncer Ayaz.)</p>
          <p>
	    Own Id: OTP-8597</p>
        </item>
        <item>
	    <p><c>receive</c> statements that can only read out a
	    newly created reference are now specially optimized so
	    that it will execute in constant time regardless of the
	    number of messages in the receive queue for the process.
	    That optimization will benefit calls to
	    <c>gen_server:call()</c>. (See <c>gen:do_call/4</c> for
	    an example of a receive statement that will be
	    optimized.)</p>
          <p>
	    Own Id: OTP-8623</p>
        </item>
        <item>
	    <p>The beam_lib:cmp/2 function now compares BEAM files in
	    stricter way. The BEAM files will be considered different
	    if there are any changes except in the compilation
	    information ("CInf") chunk. beam_lib:cmp/2 used to ignore
	    differences in the debug information (significant for
	    Dialyzer) and other chunks that did not directly change
	    the run-time behavior.</p>
          <p>
	    Own Id: OTP-8625</p>
        </item>
        <item>
          <p>
	    When a gen_server, gen_fsm process, or gen_event
	    terminates abnormally, sometimes the text representation
	    of the process state can occupy many lines of the error
	    log, depending on the definition of the state term. A
	    mechanism to trim out parts of the state from the log has
	    been added (using a format_status/2 callback). See the
	    documentation.</p>
          <p>
	    Own Id: OTP-8630</p>
        </item>
        <item>
          <p>
	    Calling <c>sys:get_status()</c> for processes that have
	    globally registered names that were not atoms would cause
	    a crash. Corrected. (Thanks to Steve Vinoski.)</p>
          <p>
	    Own Id: OTP-8656</p>
        </item>
        <item>
	    <p>The Erlang scanner has been augmented with two new
	    tokens: <c>..</c> and <c>...</c>.</p>
          <p>
	    Own Id: OTP-8657</p>
        </item>
        <item>
	    <p>Expressions evaluating to integers can now be used in
	    types and function specifications where hitherto only
	    integers were allowed ("Erlang_Integer").</p>
          <p>
	    Own Id: OTP-8664</p>
        </item>
        <item>
	    <p>The compiler optimizes record operations better.</p>
          <p>
	    Own Id: OTP-8668</p>
        </item>
        <item>
          <p>
	    The recently added BIFs erlang:min/2, erlang:max/2 and
	    erlang:port_command/3 are now auto-imported (as they were
	    originally intended to be). Due to the recent compiler
	    change (OTP-8579), the only impact on old code defining
	    it's own min/2, max/2 or port_command/3 functions will be
	    a warning, the local functions will still be used. The
	    warning can be removed by using
	    -compile({no_auto_import,[min/2,max/2,port_command/3]}).
	    in the source file.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8669 Aux Id: OTP-8579 </p>
        </item>
        <item>
          <p>
	    Now, binary_to_term/2 is auto-imported. This will cause a
	    compile warning if and only if a module has got a local
	    function with that name.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8671</p>
        </item>
        <item>
          <p>
	    The predefined builtin type tid() has been removed.
	    Instead, ets:tid() should be used.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8687</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Because of a race condition, using filelib:ensure_dir/1
	    from multiple processes to create the same path or parts
	    of the same directory structure, filelib:ensure_dir/1
	    could return a meaningless {error,eexist}. That race
	    condition has been eliminated, and {error,eexist} will
	    now be returned only if there exists a regular file,
	    device file, or some other non-directory file with the
	    same name. (Thanks to Tuncer Ayaz.)</p>
          <p>
	    Own Id: OTP-8389</p>
        </item>
        <item>
	    <p>A number of bugs concerning re and unicode are
	    corrected:</p>
	    <p>re:compile no longer loses unicode option, which also
	    fixes bug in re:split.</p>
	    <p>re:replace now handles unicode charlist replacement
	    argument</p>
	    <p>re:replace now handles unicode RE charlist argument
	    correctly</p>
	    <p>re:replace now handles binary unicode output correctly
	    when nothing is replaced.</p>
	    <p>Most code, testcases and error isolation done by Rory
	    Byrne.</p>
          <p>
	    Own Id: OTP-8394</p>
        </item>
        <item>
          <p>
	    The loading of native code was not properly atomic in the
	    SMP emulator, which could cause crashes. Also a per-MFA
	    information table for the native code has now been
	    protected with a lock since it turns that it could be
	    accessed concurrently in the SMP emulator. (Thanks to
	    Mikael Pettersson.)</p>
          <p>
	    Own Id: OTP-8397</p>
        </item>
        <item>
          <p>
	    user.erl (used in oldshell) is updated to handle unicode
	    in prompt strings (io:get_line/{1,2}). io_lib is also
	    updated to format prompts with the 't' modifier (i.e. ~ts
	    instead of ~s).</p>
          <p>
	    Own Id: OTP-8418 Aux Id: OTP-8393 </p>
        </item>
        <item>
          <p>
	    The re module: A regular expression with an option change
	    at the start of a pattern that had top-level alternatives
	    could cause overwriting and/or a crash. (Thanks to
	    Michael Santos.)</p>
          <p>
	    Own Id: OTP-8438</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The ability for the gen_server and gen_fsm callback
	    modules to format their own state for display under the
	    sys:get_status/1,2 calls has been restored and
	    documented. (Thanks to Steve Vinoski.)</p>
          <p>
	    Own Id: OTP-8324</p>
        </item>
        <item>
          <p>
	    c:nc/{1,2} used to assume that the beam file was created
	    in the same directory as the source code and failed to
	    load the code if it was not. Corrected to look for the
	    beam file in the current directory or in the directory
	    specified by the <c>{outdir,Dir}</c> option. (Thanks to
	    Alex Suraci.)</p>
          <p>
	    Own Id: OTP-8337</p>
        </item>
        <item>
	    <p>The documentation is now possible to build in an open
	    source environment after a number of bugs are fixed and
	    some features are added in the documentation build
	    process. </p>
	    <p>- The arity calculation is updated.</p>
	    <p>- The module prefix used in the function names for
	    bif's are removed in the generated links so the links
	    will look like
	    "http://www.erlang.org/doc/man/erlang.html#append_element-2"
	    instead of
	    "http://www.erlang.org/doc/man/erlang.html#erlang:append_element-2".</p>
	    <p>- Enhanced the menu positioning in the html
	    documentation when a new page is loaded.</p>
	    <p>- A number of corrections in the generation of man
	    pages (thanks to Sergei Golovan)</p>
	    <p>- The legal notice is taken from the xml book file so
	    OTP's build process can be used for non OTP
	    applications.</p>
          <p>
	    Own Id: OTP-8343</p>
        </item>
        <item>
          <p>
	    Shell tab completion now works for quoted module and
	    function names. (Thanks to Ulf Wiger.)</p>
          <p>
	    Own Id: OTP-8383</p>
        </item>
        <item>
          <p>
	    Explicit top directories in archive files are now
	    optional.</p>
          <p>
	    For example, if an archive (app-vsn.ez) just contains an
	    app-vsn/ebin/mod.beam file, the file info for the app-vsn
	    and app-vsn/ebin directories are faked using the file
	    info from the archive file as origin. The virtual
	    direcories can also be listed. For short, the top
	    directories are virtual if they does not exist.</p>
          <p>
	    Own Id: OTP-8387</p>
        </item>
        <item>
	    <p>Macros overloading has been implemented. (Thanks to
	    Christopher Faulet.)</p>
          <p>
	    Own Id: OTP-8388</p>
        </item>
        <item>
	    <p>The new function <c>shell:prompt_func/1</c> and the
	    new application configuration parameter
	    <c>shell_prompt_func</c> can be used for customizing the
	    Erlang shell prompt.</p>
          <p>
	    Own Id: OTP-8393</p>
        </item>
        <item>
          <p>
	    Improved handling of typed records in escripts</p>
          <p>
	    Own Id: OTP-8434</p>
        </item>
        <item>
          <p>
	    Added supervisor:count_children/1 to count the number of
	    children being managed without the memory impact of
	    which_children/1. (Thanks to Jay Nelson.)</p>
          <p>
	    Own Id: OTP-8436</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.4</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The documentation is now built with open source tools
	    (xsltproc and fop) that exists on most platforms. One
	    visible change is that the frames are removed.</p>
          <p>
	    Own Id: OTP-8201</p>
        </item>
        <item>
          <p>
	    [escript] The restriction that the first line in escripts
	    must begin with <c>#!</c> has been removed.</p>
          <p>
	    [escript] Some command line options to the escript
	    executable has now been documented. For example you can
	    run an escript in the debugger by just adding a command
	    line option.</p>
          <p>
	    [escript] The documentation of the escript header syntax
	    has been clarified. For example the header is optional.
	    This means that it is possible to directly "execute"
	    <c>.erl</c>, <c>.beam</c> and<c>.zip</c> files.</p>
          <p>
	    Own Id: OTP-8215</p>
        </item>
        <item>
	    <p>Optimized array:from_orddict/1, it is now faster and
	    uses less memory if the orddict was sparse.</p>
	    <p>Changed array:reset/2, it will now never expand the
	    array which it could before for non fixed arrays. See the
	    documentation.</p>
          <p>
	    Own Id: OTP-8216</p>
        </item>
        <item>
	    <p>The Erlang Pretty Printer (<c>erl_pp</c>) now puts the
	    leading <c>[</c> of list comprehensions as well as the
	    leading <c>&lt;&lt;</c> of bit string comprehensions on a
	    separate line in order to expose the Cover counter of the
	    template.</p>
          <p>
	    Own Id: OTP-8227</p>
        </item>
        <item>
	    <p>The extension ".xrl" used for Leex input files is now
	    recognized by the compiler.</p>
          <p>
	    Own Id: OTP-8232</p>
        </item>
        <item>
          <p>
	    Some clarifications have been made in the documentation
	    regarding <c>gen_server</c>, <c>gen_fsm</c>, and
	    <c>gen_event</c> behavior when handling <c>'EXIT'</c>
	    messages from the parent process. For more information
	    see the <seealso
	    marker="gen_server">gen_server(3)</seealso>, <seealso
	    marker="gen_fsm">gen_fsm(3)</seealso>, and <seealso
	    marker="gen_event">gen_event(3)</seealso> documentation.</p>
          <p>
	    Own Id: OTP-8255 Aux Id: seq11419 </p>
        </item>
        <item>
	    <p>The -on_load() directive can be used to run a function
	    when a module is loaded. It is documented in the section
	    about code loading in the Reference Manual.</p>
          <p>
	    Own Id: OTP-8295</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.3.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            An erroneous type spec for <c>gen:start/6</c> caused
            dialyzer to erroneously issue warnings when
            <c>{spawn_opt, SpawnOptionList}</c> was passed in the
            option list to the <c>gen_server</c> and <c>gen_fsm</c>
            start functions.</p>
          <p>
            Own Id: OTP-8068 Aux Id: seq11323, seq11314 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The linter used to crash on invalid <c>-opaque</c>
	    declarations.</p>
          <p>
	    Own Id: OTP-8051</p>
        </item>
        <item>
	    <p>Bugs in <c>digraph:add_edge/5</c> and
	    <c>digraph:del_path/3</c> have been fixed. (Thanks to
	    Crystal Din.)</p>
          <p>
	    Own Id: OTP-8066</p>
        </item>
        <item>
	    <p>When trying to insert objects with
	    <c>dets:insert_new()</c> into a Dets table of type
	    <c>duplicate_bag</c>, already existing objects would
	    sometimes be duplicated. This bug has been fixed. (Thanks
	    to Crystal Din.)</p>
          <p>
	    Own Id: OTP-8070</p>
        </item>
        <item>
          <p>
	    Running erlc in a very deep directory (with a path length
	    of more 256 or more characters) would cause the emulator
	    to crash in a call to <c>list_to_atom/1</c>. (Thanks to
	    Chris Newcombe.)</p>
          <p>
	    Own Id: OTP-8124</p>
        </item>
        <item>
	    <p>A few minor bugs have been fixed in the Erlang Code
	    Preprocessor (<c>epp</c>).</p>
          <p>
	    Own Id: OTP-8130</p>
        </item>
        <item>
	    <p>A bug in The Erlang Meta Interpreter (<c>erl_eval</c>)
	    has been fixed: exceptions generated in the template of
	    bit string comprehensions were not handled properly.
	    (Thanks to Ulf Wiger.)</p>
          <p>
	    Own Id: OTP-8133</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Option <c>{capture,none}</c> was missing in documentation
	    for <c>re:run/3</c>.</p>
          <p>
	    Own Id: OTP-8113</p>
        </item>
        <item>
	    <p>When <c>erl_scan:tokens()</c> returns an error tuple
	    <c>{error, ErrorInfo, EndLocation</c>}, the list
	    <c>LeftOverChars</c> is the remaining characters of the
	    input data, starting from <c>EndLocation</c>. It used to
	    be the empty list.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8129</p>
        </item>
        <item>
	    <p>The Erlang Meta Interpreter (<c>erl_eval</c>) has been
	    somewhat optimized when it comes to interpreting
	    <c>receive</c>-expressions. (Thanks to Richard
	    Carlsson.)</p>
          <p>
	    Own Id: OTP-8139</p>
        </item>
        <item>
	    <p>The Erlang Pretty Printer (<c>erl_pp</c>) has been
	    modified as to handle types.</p>
          <p>
	    Own Id: OTP-8150</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The text of tokens returned by the Erlang scanner
	    (<c>erl_scan</c>) was sometimes empty when the
	    <c>text</c> option was given and <c>StartLocation</c> was
	    a line. This bug has been fixed.</p>
          <p>
	    Own Id: OTP-7965</p>
        </item>
        <item>
	    <p>The documentation for <c>base64:decode/1</c> has been
	    updated to point out that it strips whitespace.</p>
	    <p><c>base64:decode/1</c> and <c>base64:mime_decode/1</c>
	    would sometimes fail instead of stripping away non-base64
	    characters.</p>
          <p>
	    Own Id: OTP-7984</p>
        </item>
        <item>
          <p>
	    Two types in the <c>gen</c> module were corrected.</p>
          <p>
	    Own Id: OTP-8029 Aux Id: seq11296 </p>
        </item>
        <item>
          <p>
	    <c>array:from_orddict([])</c> and
	    <c>array:from_list([])</c> would construct fixed arrays
	    instead of extendible arrays.</p>
          <p>
	    Own Id: OTP-8033</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Interpreted escripts are now tail recursive.</p>
          <p>
	    The function erl_eval:expr/5 has been introduced.</p>
          <p>
	    Own Id: OTP-7933</p>
        </item>
        <item>
          <p>
	    <c>gen_server:call/2,3</c> will be somewhat faster if the
	    calling process has a many messages in its message queue.</p>
          <p>
	    Own Id: OTP-7979</p>
        </item>
        <item>
          <p>
	    Random now supports seed with arity one,
	    <c>random:seed/1</c>, which takes a three-tuple.</p>
          <p>
	    Own Id: OTP-8019</p>
        </item>
        <item>
	    <p>The <c>regexp</c> module now recognizes the escape
	    sequences <c>\xXY</c> and <c>\x{X...}</c>.</p>
          <p>
	    Own Id: OTP-8024</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The documentation of <c>dets:open_file/1</c> now
	    states that the file is repaired if it has not been
	    properly closed. (Thanks to Ulf Wiger.)</p>
          <p>
	    Own Id: OTP-7895</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The Erlang scanner no longer returns the text of
	    tokens when the start location is a pair of a line and
	    column unless the new option <c>text</c> is supplied
	    (incompatibility with R13A).</p> <p>There are new
	    functions to access the attributes of tokens:
	    <c>attributes_info/1,2</c> and
	    <c>set_attribute/3</c>.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7892 Aux Id: OTP-7810 </p>
        </item>
        <item>
          <p>
	    Several glitches and performance issues in the Unicode
	    and I/O-system implementation of R13A have been
	    corrected.</p>
          <p>
	    Own Id: OTP-7896 Aux Id: OTP-7648 OTP-7887 </p>
        </item>
        <item>
          <p>
	    The type spec of filelib:wildcard/2 has been corrected.</p>
          <p>
	    Own Id: OTP-7915</p>
        </item>
        <item>
	    <p>New functions: <c>gb_sets:is_disjoint/2</c>,
	    <c>ordsets:is_disjoint/2</c>, and
	    <c>gb_sets:is_disjoint/2</c>.</p>
          <p>
	    Own Id: OTP-7947</p>
        </item>
        <item>
	    <p>The function <c>gb_trees:map/2</c> which was added in
	    R13A is now documented.</p>
          <p>
	    Own Id: OTP-7948</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.16</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>Fixed a minor race conditions in
	    <c>gen_server:start*</c>: if one of these functions
	    returned <c>{error,Reason}</c> or <c>ignore</c>, the name
	    could still be registered (either locally or in
	    <c>global</c>).</p>
	    <p>A process started by <c>proc_lib</c> in some cases
	    depended on its process dictionary not to be erased, and
	    would crash when terminating abnormally and not generate
	    a proper crash report. This has been corrected (but the
	    initial call will not be shown in the error report if the
	    process dictionary has been erased). NOTE: There is no
	    longer any need to erase the process dictionary for
	    memory conservation reasons, since the actual call
	    arguments are no longer saved in the process
	    dictionary.</p>
          <p>
	    Own Id: OTP-7669</p>
        </item>
        <item>
	    <p>The Erlang preprocessor used wrong line number when
	    stringifying macro arguments. (Thanks to John
	    Hughes.)</p>
          <p>
	    Own Id: OTP-7702</p>
        </item>
        <item>
	    <p>A bug in the <c>qlc</c> module has been fixed: merge
	    join sometimes failed to return all answers. (Thanks to
	    Bernard Duggan.)</p>
          <p>
	    Own Id: OTP-7714</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>A new option, <c>key_equality</c>, has been added to
	    <c>qlc:table/2</c>. This option makes it possible for
	    <c>qlc</c> to better handle tables that use <c>==/2</c>
	    when comparing keys for equality (examples of such tables
	    are ordered ETS tables and gb_table in qlc(3)).</p>
          <p>
	    Own Id: OTP-6674</p>
        </item>
        <item>
	    <p>The functions <c>lists:seq/1,2</c> return the empty
	    list in a few cases when they used to generate an
	    exception, for example <c>lists:seq(1, 0)</c>. See
	    lists(3) for details. (Thanks to Richard O'Keefe.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7230</p>
        </item>
        <item>
          <p>
	    The order of objects visited in select for ordered_set is
	    now documented.</p>
          <p>
	    Own Id: OTP-7339</p>
        </item>
        <item>
          <p>
	    It is now possible to debug code in escripts and
	    archives.</p>
          <p>
	    Own Id: OTP-7626</p>
        </item>
        <item>
	    <p>Support for Unicode is implemented as described in
	    EEP10. Formatting and reading of unicode data both from
	    terminals and files is supported by the io and io_lib
	    modules. Files can be opened in modes with automatic
	    translation to and from different unicode formats. The
	    module 'unicode' contains functions for conversion
	    between external and internal unicode formats and the re
	    module has support for unicode data. There is also
	    language syntax for specifying string and character data
	    beyond the ISO-latin-1 range.</p>
	    <p>The interactive shell will support input and output of
	    unicode characters when the terminal and operating system
	    supports it.</p>
	    <p>Please see the EEP and the io/io_lib manual pages as
	    well as the stdlib users guide for details.</p>
	    <p><em>I/O-protocol incompatibilities:</em></p>
	    <p>The io_protocol between io_Server and client is
	    updated to handle protocol data in unicode formats. The
	    updated protocol is now documented. The specification
	    resides in the stdlib <em>users manual</em>, which is a
	    new part of the manual.</p>
	    <p><em>io module incompatibilities:</em></p>
	    <p>The io:put_chars, io:get_chars and io:get_line all
	    handle and return unicode data. In the case where
	    binaries can be provided (as to io:put_chars), they shall
	    be encoded in UTF-8. When binaries are returned (as by
	    io:get_line/get_chars when the io_server is set in
	    <em>binary mode</em>) the returned data is also
	    <em>always</em> encoded as UTF-8. The file module however
	    still returns byte-oriented data, why file:read can be
	    used instead of io:get_chars to read binary data in
	    ISO-latin-1.</p>
	    <p><em>io_lib module incompatibilities:</em></p>
	    <p>io_lib:format can, given new format directives (i.e
	    "~ts" and "~tc"), return lists containing integers larger
	    than 255. </p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7648 Aux Id: OTP-7580 OTP-7514 OTP-7494
	    OTP-7443 OTP-7181 EEP10 EEP11 </p>
        </item>
        <item>
          <p>
	    The function <c>pool:attach/1</c> now returns
	    <c>already_attached</c> if the node is already attached,
	    rather than <c>allready_attached</c> (sic!). (Thanks to
	    Edwin Fine.)</p>
          <p>
	    Own Id: OTP-7653 Aux Id: OTP-7603 </p>
        </item>
        <item>
          <p>
	    Preprocessor directives are now allowed in escripts. This
	    means that for example macros may be used in escripts.</p>
          <p>
	    Own Id: OTP-7662</p>
        </item>
        <item>
	    <p>When a process started with <c>proc_lib</c>,
	    <c>gen_server</c>, or <c>gen_fsm</c> exits with reason
	    <c>{shutdown,Term}</c>, a crash report will no longer be
	    generated (to allow a clean shutdown, but still provide
	    additional information to process that are linked to the
	    terminating process).</p>
          <p>
	    Own Id: OTP-7740 Aux Id: seq10847 </p>
        </item>
        <item>
          <p>
	    A new BIF, <c>lists:keyfind/3</c>, has been added. It
	    works like <c>lists:keysearch/3</c> except that it does
	    not wrap the returned tuple in a <c>value</c> tuple in
	    case of success. (Thanks to James Hague for suggesting
	    this function.)</p>
          <p>
	    Own Id: OTP-7752</p>
        </item>
        <item>
	    <p><c>lists:suffix(Suffix, List)</c> used to have a a
	    complexity of <c>length(Suffix)*length(List)</c> (which
	    could become quite slow for some inputs). It has now been
	    re-implemented so that its complexity is
	    <c>length(Suffix)+length(List)</c>. (Thanks to Richard
	    O'Keefe for the new implementation.)</p>
          <p>
	    Own Id: OTP-7797</p>
        </item>
        <item>
	    <p>The Erlang scanner has been augmented as to return
	    white spaces, comments, and exact location of tokens. The
	    functions <c>string/3</c>, <c>tokens/4</c>, and
	    <c>token_info/1,2</c> are new. See erl_scan(3) for
	    details.</p>
	    <p><c>tokens/3,4</c> have been modified as to return a
	    list of tokens instead of an error when <c>eof</c> is
	    encountered before the dot.</p>
          <p>
	    Own Id: OTP-7810</p>
        </item>
        <item>
          <p>
	    <c>filelib:fold_files/5</c> now uses the <c>re</c> module
	    instead of the <c>regexp</c> module for regular
	    expression matching. In practice, this change will not be
	    a problem for most regular expressions used for
	    <c>filelib:fold_files/5</c>. (The major difference in
	    regular expression is that parenthesis and curly brackets
	    is treated as literal characters by <c>regexp</c> but as
	    special characters by <c>re</c>; fortunately, those
	    characters are rarely used in filenames.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7819</p>
        </item>
        <item>
          <p>
	    <c>digraph:new(Type)</c> will now cause a <c>badarg</c>
	    exception if <c>Type</c> is not a valid type. Similarly,
	    <c>digraph_utils:subgraph/2,3</c> will now cause a
	    <c>badarg</c> if the arguments are invalid. (Those
	    functions used to return error tuples if something was
	    wrong.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7824</p>
        </item>
        <item>
	    <p>The argument passed to <c>random:uniform/1</c> must
	    now be an integer (as stated in the documentation). In
	    previous releases, a floating point number was also
	    allowed.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7827</p>
        </item>
        <item>
	    <p>The copyright notices have been updated.</p>
          <p>
	    Own Id: OTP-7851</p>
        </item>
        <item>
	    <p>A few missing match spec functions was added to
	    dbg:fun2ms; exception_trace/0 and trace/2,3.</p>
	    <p>There is a new function queue:member/2.</p>
	    <p>A bug in io_lib:fread that made it accidentally
	    concatenate fields separated by newline has been
	    corrected. Reported and analyzed by Matthew Palmer to
	    erlang-patches.</p>
          <p>
	    Own Id: OTP-7865</p>
        </item>
      </list>
    </section>

</section>


<section><title>STDLIB 1.15.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>A bug in the <c>qlc</c> module has been fixed: when
	    merge joining two query handles the temporary file used
	    for equivalence classes was not truncated properly which
	    could result in poor performance.</p>
          <p>
	    Own Id: OTP-7552</p>
        </item>
        <item>
          <p>
	    The characters 16#C0 and 16#E0 ("A" and "a" with grave
	    accent), were not properly converted by the
	    <c>string:to_lower/1</c> and <c>string:to_upper/1</c>
	    functions. (Thanks to Richard O'Keefe.)</p>
          <p>
	    Own Id: OTP-7589</p>
        </item>
        <item>
          <p>
	    The function <c>pool:attach/1</c> now returns
	    <c>already_attached</c> if the node is already attached,
	    rather than <c>allready_attached</c> (sic!). (Thanks to
	    Edwin Fine.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7603</p>
        </item>
        <item>
	    <p>The documentation for <c>io:get_line/1,2</c> now
	    mentions that the return value can also be
	    <c>{error,Reason}</c>.</p>
          <p>
	    Own Id: OTP-7604 Aux Id: seq11063 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The split function is now added to the re library.
	    Exceptions and errors from both run, replace and split
	    are made more consistent.</p>
          <p>
	    Own Id: OTP-7514 Aux Id: OTP-7494 </p>
        </item>
        <item>
	    <p>Processes spawned using <c>proc_lib</c> (including
	    <c>gen_server</c> and other library modules that use
	    <c>proc_lib</c>) no longer keep the entire argument list
	    for the initial call, but only the arity.</p>
	    <p>Also, if <c>proc_lib:spawn/1</c> is used to spawn a
	    fun, the actual fun is not kept, but only module,
	    function name, and arity of the function that implements
	    the fun.</p>
	    <p>The reason for the change is that keeping the initial
	    fun (or a fun in an argument list), would prevent
	    upgrading the code for the module. A secondary reason is
	    that keeping the fun and function arguments could waste a
	    significant amount of memory.</p>
	    <p>The drawback with the change is that the crash reports
	    will provide less precise information about the initial
	    call (only <c>Module:Function/Arity</c> instead of
	    <c>Module:Function(Arguments)</c>). The function
	    <c>proc_lib:initial_call/1</c> still returns a list, but
	    each argument has been replaced with a dummy atom.</p>
          <p>
	    Own Id: OTP-7531 Aux Id: seq11036 </p>
        </item>
        <item>
          <p>
	    There is now experimental support for loading of code
	    from archive files. See the documentation of <c>code</c>,
	    <c>init</c>, <c>erl_prim_loader </c> and <c>escript</c>
	    for more info.</p>
          <p>
	    The error handling of <c>escripts</c> has been improved.</p>
          <p>
	    An <c>escript</c> may now set explicit arguments to the
	    emulator, such as <c>-smp enabled</c>.</p>
          <p>
	    An <c>escript</c> may now contain a precompiled beam
	    file.</p>
          <p>
	    An <c>escript</c> may now contain an archive file
	    containing one or more applications (experimental).</p>
          <p>
	    The internal module <c>code_aux</c> has been removed.</p>
          <p>
	    Own Id: OTP-7548 Aux Id: otp-6622 </p>
        </item>
        <item>
          <p>
	    Enabled explicit control of which types of files that
	    should be compressed in a ZIP archive.</p>
          <p>
	    Own Id: OTP-7549 Aux Id: otp-6622 </p>
        </item>
        <item>
          <p>
	    In the job control mode, the "s" and "r" commands now
	    take an optional argument to specify which shell to
	    start. (Thanks to Robert Virding.)</p>
          <p>
	    Own Id: OTP-7617</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.15.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    A bug in the calendar module could cause
	    calendar:local_time_to_universal_time_dst/1 to return
	    duplicate identical values for local times in timezones
	    without DST. Multiple values should only be returned when
	    a local time is within the hour occurring twice due to
	    shift from DST to non-DST, and certainly only in
	    timezones with DST. The correct behaviour is now
	    implemented.</p>
          <p>
	    Own Id: OTP-7344 Aux Id: seq10960 </p>
        </item>
        <item>
	    <p>The documentation of <c>(d)ets:init_table()</c> has
	    been corrected. (Thanks to Paul Mineiro.)</p>
          <p>
	    Own Id: OTP-7413</p>
        </item>
        <item>
	    <p>The soft upper limit of 60 on the number of non-white
	    characters on a line, which was introduced in R12B-0 for
	    the control sequences <c>p</c> and <c>P</c> of the
	    functions <c>io:fwrite/2,3</c> and
	    <c>io_lib:fwrite/2</c>, has been removed. This means that
	    terms whose printed representation fits on a line will
	    have no NEWLINEs. The Erlang shell still uses the 60
	    character limit, though.</p>
          <p>
	    Own Id: OTP-7421 Aux Id: OTP-6708 </p>
        </item>
        <item>
	    <p>Some debug code has been removed from Dets.</p>
          <p>
	    Own Id: OTP-7424</p>
        </item>
        <item>
	    <p>The documentation of <c>dets:match_delete/2</c> has
	    been corrected. (Thanks to Paul Mineiro.)</p>
          <p>
	    Own Id: OTP-7445</p>
        </item>
        <item>
	    <p>Corrections of digraph(3). (Thanks to Vlad
	    Dumitrescu.)</p>
          <p>
	    Own Id: OTP-7492</p>
        </item>
        <item>
          <p>
	    For the process that an escript runs in, the
	    <c>trap_exit</c> process flag is now <c>false</c> instead
	    of <c>true</c> (as in previous releases). Scripts that
	    depend on the previous (counter-intuitive) behaviour
	    might not work. (Thanks to Bengt Kleberg.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-7517</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The documentation of <c>lists:(u)sort/2</c> now states
	    what is expected of an ordering function.</p>
          <p>
	    Own Id: OTP-7489</p>
        </item>
        <item>
          <p>
	    The re module is extended with repetitive matches (global
	    option) and replacement function.</p>
          <p>
	    Own Id: OTP-7494 Aux Id: OTP-7181 </p>
        </item>
        <item>
	    <p>The Erlang shell now displays a nicer error message
	    when evaluating an undefined command. (Thanks to Richard
	    Carlsson.)</p>
          <p>
	    Own Id: OTP-7495</p>
        </item>
      </list>
    </section>

</section>


<section><title>STDLIB 1.15.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    zip:unzip to/from binary with empty directories did not
	    work. (Thanks to Martin Dvorak.)</p>
          <p>
	    Own Id: OTP-7248</p>
        </item>
        <item>
	    <p>The documentation of the control sequence <c>w</c> of
	    the <c>io_lib</c> module now states that floating point
	    numbers are printed accurately.</p>
          <p>
	    Own Id: OTP-7324 Aux Id: OTP-7084 </p>
        </item>
        <item>
          <p>
	    zip:unzip was not supporting a flavour of the zip format
	    found in jar-files.</p>
          <p>
	    Own Id: OTP-7382 Aux Id: seq10970 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    An experimental module "re" is added to the emulator
	    which interfaces a publicly available regular expression
	    library for Perl-like regular expressions (PCRE). The
	    interface is purely experimental and *will* be subject to
	    change.</p>
          <p>
	    The implementation is for reference and testing in
	    connection to the relevant EEP.</p>
          <p>
	    Own Id: OTP-7181</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.15.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> When inserting many small objects, Dets sometimes
	    crashed when reaching the maximum number of slots.
	    (Thanks to Daniel Goertzen.) </p>
          <p>
	    Own Id: OTP-7146</p>
        </item>
        <item>
	    <p>Processes linked to the Erlang shell did not get an
	    exit signal when the evaluator process was killed. This
	    bug, introduced in R12B-0, has been fixed.</p>
          <p>
	    Own Id: OTP-7184 Aux Id: OTP-6554 </p>
        </item>
        <item>
          <p>
	    Invalid arguments to <c>ets:update_counter/3</c> were not
	    handled correctly. A tuple position (<c>Pos</c>) less
	    than 1 caused the element directly following the key to
	    be updated (as if no position at all had been specified).
	    All invalid values for <c>Pos</c> will now fail with
	    <c>badarg</c>.</p>
          <p>
	    Own Id: OTP-7226</p>
        </item>
        <item>
          <p>
	    For certain terminals, io:columns/0 could return 0
	    instead of enotsup. That is now corrected.</p>
          <p>
	    Own Id: OTP-7229 Aux Id: seq10886 </p>
        </item>
        <item>
	    <p><c>qlc:info()</c> can now handle port identifiers,
	    pids, references, and funs. (Thanks to Wojciech Kaczmare
	    for reporting this bug.)</p> <p>When evaluating the
	    <c>parent_fun</c> messages sent to the process calling
	    <c>qlc:cursor()</c> were sometimes erroneously consumed.
	    This bug has been fixed.</p>
          <p>
	    Own Id: OTP-7232</p>
        </item>
        <item>
	    <p><c>erl_parse:abstract()</c> can now handle bit
	    strings.</p>
          <p>
	    Own Id: OTP-7234</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The <c>queue</c> module has been rewritten to make it
	    easier to use. Suggestions and discussion from and with
	    among others Lev Walkin, Anders Ramsell and Rober Virding
	    in december 2007 on [email protected]. It was
	    also discussed to change the internal representation to
	    contain length information which would speed up
	    <c>len/1</c> but that change has been postponed. Anyone
	    interested may write an EEP and try to reach an
	    acceptable compromise for queue overhead and thereby the
	    speed of all other operations than <c>len/1</c>. The
	    <c>queue</c> module is now optimized for fast and minimal
	    garbage <c>in/2</c> and <c>out/1</c> and such. See the
	    documentation.</p>
	    <p>New functions: <c>is_queue/1</c>, <c>get/1</c>,
	    <c>get_r/1</c>, <c>peek/1</c>, <c>peek_r/1</c>,
	    <c>drop/1</c>, <c>drop_r/1</c> and <c>liat/1</c>.
	    <c>is_queue/1</c> is a new predicate, <c>liat/1</c> is a
	    correction of an old misspelling, and the others
	    (<c>get</c>*, <c>peek</c>* and <c>drop</c>*) are new
	    interface functions.</p>
          <p>
	    Own Id: OTP-7064</p>
        </item>
        <item>
	    <p>The functions <c>io_lib:write/1,2</c> and
	    <c>io_lib:print/1,4</c> have been changed when it comes
	    to writing floating point numbers. This change affects
	    the control sequences <c>p</c>, <c>P</c>, <c>w</c>, and
	    <c>W</c> of the <c>io_lib</c> module. (Thanks to Bob
	    Ippolito for code contribution.) </p>
          <p>
	    Own Id: OTP-7084</p>
        </item>
        <item>
          <p>
	    Updated the documentation for
	    <c>erlang:function_exported/3</c> and <c>io:format/2</c>
	    functions to no longer state that those functions are
	    kept mainly for backwards compatibility.</p>
          <p>
	    Own Id: OTP-7186</p>
        </item>
        <item>
          <p>
	    A new BIF ets:update_element/3. To update individual
	    elements within an ets-tuple, without having to read,
	    update and write back the entire tuple.</p>
          <p>
	    Own Id: OTP-7200</p>
        </item>
        <item>
	    <p><c>string:join/2</c> now accepts an empty list as
	    first argument.</p>
          <p>
	    Own Id: OTP-7231 Aux Id: OTP-6671 </p>
        </item>
        <item>
	    <p><c>qlc:info/1,2</c> accepts a new option,
	    <c>depth</c>. The type <c>SelectedObjects</c> used in the
	    description of <c>qlc:table/2</c> has been augmented.</p>
          <p>
	    Own Id: OTP-7238</p>
        </item>
        <item>
	    <p><c>tuple_size/1</c> and <c>byte_size/1</c> have been
	    substituted for <c>size/1</c> in the documentation.</p>
          <p>
	    Own Id: OTP-7244</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.15.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Ets:select/3 in combination with
	    ets:repair_continuation/2 and ordered_set data tables
	    could result in function_clause although used as
	    intended. This is now corrected. Thanks to Paul Mineiro
	    for finding and isolating the bug!</p>
          <p>
	    Own Id: OTP-7025</p>
        </item>
        <item>
	    <p>The compiler warning for the deprecated function
	    <c>ftp:close/1</c> now mentions the correct replacement
	    function.</p>
	    <p>The warning for the removed functions in the
	    <c>httpd_util</c> module have been changed to say they
	    have been removed, not merely deprecated. (Thanks to
	    Fredrik Thulin.)</p>
          <p>
	    Own Id: OTP-7034 Aux Id: seq10825 </p>
        </item>
        <item>
	    <p>In <c>(Expr)#r{}</c> (no fields are updated),
	    <c>Expr</c> is no longer evaluated more than once. There
	    is also a test that <c>Expr</c> is of the correct record
	    type. (Thanks to Dominic Williams.)</p>
          <p>
	    Own Id: OTP-7078 Aux Id: OTP-4962 </p>
        </item>
        <item>
	    <p>Documentation bugfixes and clarifications.</p> (Thanks
	    to Joern ([email protected]), Matthias Lang, and Richard
	    Carlsson.)
          <p>
	    Own Id: OTP-7079</p>
        </item>
        <item>
	    <p>Duplicated objects were sometimes not deleted from the
	    list of answers when a QLC table was traversed using a
	    match specification. (Thanks to Dmitri Girenko.)</p>
          <p>
	    Own Id: OTP-7114</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The documentation has been updated so as to reflect
	    the last updates of the Erlang shell as well as the minor
	    modifications of the control sequence <c>p</c> of the
	    <c>io_lib</c> module.</p> <p>Superfluous empty lines have
	    been removed from code examples and from Erlang shell
	    examples.</p>
          <p>
	    Own Id: OTP-6944 Aux Id: OTP-6554, OTP-6911 </p>
        </item>
        <item>
	    <p><c>tuple_size/1</c> and <c>byte_size/1</c> have been
	    substituted for <c>size/1</c>.</p>
          <p>
	    Own Id: OTP-7009</p>
        </item>
        <item>
          <p>
	    It is now possible to hibernate a
	    gen_server/gen_event/gen_fsm. In gen_server and gen_fsm,
	    hibernation is triggered by returning the atom
	    'hibernate' instead of a timeout value. In the gen_event
	    case hibernation is triggered by a event handler
	    returning a tuple with an extra element containing the
	    atom 'hibernate'.</p>
          <p>
	    Own Id: OTP-7026 Aux Id: seq10817 </p>
        </item>
        <item>
	    <p>Some undocumented debug functionality has been added
	    to Dets.</p>
          <p>
	    Own Id: OTP-7066</p>
        </item>
        <item>
	    <p>The functions <c>digraph_utils:is_tree/1</c>,
	    <c>digraph_utils:is_arborescence/1</c>, and
	    <c>digraph_utils:arborescence_root/1</c> are new.</p>
          <p>
	    Own Id: OTP-7081</p>
        </item>
        <item>
          <p>
	    The compiler could generate suboptimal code for record
	    updates if the record update code consisted of multiple
	    source code lines.</p>
          <p>
	    Own Id: OTP-7101</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.15</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>Bugs have been fixed in <c>qlc</c>:</p> <list
	    type="bulleted"> <item>Setting the <c>lookup_fun</c>
	    option of <c>qlc:table/2</c> to <c>undefined</c> could
	    cause a crash.</item> <item>If a QLC restricted some
	    column of a table in such a way that a traversal using a
	    match specification was possible and the QLC also
	    compared the key column or some indexed column of the the
	    table with a column of some other table, <c>qlc</c>
	    always chose to traverse the table first, never
	    considering lookup join. This has been changed so that
	    lookup join is always preferred; if an initial traversal
	    using the match specification is desired, the query needs
	    to be rewritten introducing an extra QLC with the
	    filter(s) restricting the column.</item> <item>When
	    trying to find candidates for match specifications and
	    lookup, filters using variables from one generator only
	    are ignored unless they are placed immediately after the
	    generator and possibly other filters using variables from
	    the same generator. In particular, filters joining two
	    tables should not be placed between the generator and the
	    filters using the generator only.</item> <item>The
	    call-back function <c>TraverseFun</c> used for
	    implementing QLC tables is allowed to return a term other
	    than a list since STDLIB 1.14 (OTP-5195). However, when
	    the returned term was a fun <c>qlc</c> often tried to
	    call the fun instead of returning it.</item> </list> <p>A
	    few minor optimizations have been implemented as
	    well.</p>
          <p>
	    Own Id: OTP-6673</p>
        </item>
        <item>
	    <p>A bug concerning the use of parameterized modules from
	    the shell has been fixed.</p>
          <p>
	    Own Id: OTP-6785</p>
        </item>
        <item>
	    <p>A bug regarding the size expression of the bit syntax
	    has been fixed in the <c>erl_eval</c> module.</p>
          <p>
	    Own Id: OTP-6787</p>
        </item>
        <item>
          <p>
	    The log_mf_h event handler didn't close the index file
	    when it was done reading it causing a file descriptor
	    leak.</p>
          <p>
	    Own Id: OTP-6800</p>
        </item>
        <item>
          <p>
	    Definitions for the <c>filename()</c> and
	    <c>dirname()</c> types have been added to the
	    documentation for the <c>filelib</c> module.</p>
          <p>
	    Own Id: OTP-6870</p>
        </item>
        <item>
	    <p>file:write_file/3, file:write/2 and file:read/2 could
	    crash (contrary to documentation) for odd enough file
	    system problems, e.g write to full file system. This bug
	    has now been corrected.</p> <p>In this process the file
	    module has been rewritten to produce better error codes.
	    Posix error codes now originate from the OS file system
	    calls or are generated only for very similar causes (for
	    example 'enomem' is generated if a memory allocation
	    fails, and 'einval' is generated if the file handle in
	    Erlang is a file handle but currently invalid).</p>
	    <p>More Erlang-ish error codes are now generated. For
	    example <c>{error,badarg}</c> is now returned from
	    <c>file:close/1</c> if the argument is not of a file
	    handle type. See file(3).</p> <p>The possibility to write
	    a single byte using <c>file:write/2</c> instead of a list
	    or binary of one byte, contradictory to the
	    documentation, has been removed.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-6967 Aux Id: OTP-6597 OTP-6291 </p>
        </item>
        <item>
	    <p>A bug concerning the evaluation of the <c>++/2</c>
	    operator has been fixed in <c>erl_eval</c>. (Thanks to
	    Matthew Dempsky.)</p>
          <p>
	    Own Id: OTP-6977</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The behaviour of the internal functions gen:call/3,4
	    has been changed slightly in the rare case that when the
	    caller was linked to the called server, and the server
	    crashed during the call; its exit signal was consumed by
	    the gen:call/3,4 code and converted to an exit exception.
	    This exit signal is no longer consumed.</p>
	    <p>To even notice this change, 1) the calling process has
	    to be linked to the called server.</p>
          <p>
	    2) the call must not be remote by name that is it must be
	    local or remote by pid, local by name or global by name.</p>
          <p>
	    3) the calling process has to have set
	    <c>process_flag(trap_exit, true)</c>.</p>
          <p>
	    4) the server has to crash during the call.</p>
          <p>
	    5) the calling process has to be sensitive to getting
	    previously consumed <c>{'EXIT',Pid,Reason}</c> messages
	    in its message queue.</p>
	    <p>The old behaviour was once the only way for a client
	    to notice if the server died, but has since
	    <c>erlang:monitor(process, {Name,Node})</c> was
	    introduced and used in gen:call been regarded as an
	    undesired behaviour if not a bug.</p>
	    <p>The affected user APIs are:
	    <c>gen_server:call/2,3</c>,
	    <c>gen_fsm:sync_send_event/2,3</c>,
	    <c>gen_fsm:sync_send_all_state_event/2,3</c>,
	    <c>gen_event:_</c>, <c>sys:_</c> and maybe a few others
	    that hardly will be noticed.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-3954 Aux Id: Seq 4538 </p>
        </item>
        <item>
	    <p>When an exception occurs the Erlang shell now displays
	    the class, the reason, and the stacktrace in a clearer
	    way (rather than dumping the raw EXIT tuples as before).
	    <c>proc_lib:format/1</c> displays the exception of crash
	    reports in the same clearer way.</p> <p>The new shell
	    command <c>catch_exception</c> and the new application
	    configuration parameter <c>shell_catch_exception</c> can
	    be used for catching exceptions that would normally exit
	    the Erlang shell.</p>
          <p>
	    Own Id: OTP-6554 Aux Id: OTP-6289 </p>
        </item>
        <item>
	    <p>The function <c>string:join/2</c> joins strings in a
	    list with a separator. Example: '<c>string:join(["a",
	    "b", "c"], ", ") gives "a, b, c"</c>'</p>
          <p>
	    Own Id: OTP-6671</p>
        </item>
        <item>
	    <p>The control sequence <c>P</c> of the <c>Format</c>
	    argument of the functions <c>io:fwrite/2,3</c> and
	    <c>io_lib:fwrite/2</c> now inserts fewer line breaks when
	    printing tuples and lists. A soft upper limit of 60 on
	    the number of non-white characters on a line has been
	    introduced.</p>
          <p>
	    Own Id: OTP-6708</p>
        </item>
        <item>
          <p>
	    The new module <c>array</c> provides a fast functional
	    array implementation.</p>
          <p>
	    Own Id: OTP-6733</p>
        </item>
        <item>
	    <p>Functions that have long been deprecated have now been
	    removed from the following modules: <c>dict</c>,
	    <c>erl_eval</c>, <c>erl_pp</c>, <c>io</c>, <c>io_lib</c>,
	    <c>lists</c>, <c>orddict</c>, <c>ordsets</c>,
	    <c>sets</c>, and <c>string</c>.</p>
	    <p>The undocumented function <c>lists:zf/3</c> has also
	    been removed (use a list comprehension or
	    <c>lists:zf/2</c> instead).</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-6845</p>
        </item>
        <item>
          <p>
	    Minor documentation corrections for file:pread/2 and
	    file:pread/3.</p>
          <p>
	    Own Id: OTP-6853</p>
        </item>
        <item>
          <p>
	    Contract directives for modules in Kernel and STDLIB.</p>
          <p>
	    Own Id: OTP-6895</p>
        </item>
        <item>
	    <p>The <c>ets:fixtable/2</c> function, which has been
	    deprecated for several releases, has been removed.</p>
	    <p>The <c>ets:info/1</c> function has been reimplemented
	    as a BIF, which guarantees that information returned is
	    consistent.</p>
	    <p>The <c>ets:info/2</c> function now fails with reason
	    <c>badarg</c> if the second argument is invalid.
	    (Dialyzer can be used to find buggy code where the second
	    argument is misspelled.)</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-6906</p>
        </item>
        <item>
	    <p>The Erlang pretty printer <c>erl_pp</c> now inserts
	    more newlines in order to facilitate line coverage
	    analysis by <c>Cover</c>. (Thanks to Thomas Arts.)</p>
          <p>
	    Own Id: OTP-6911</p>
        </item>
        <item>
          <p>
	    The documentation for ets:safe_fixtable/2, ets:foldl/3,
	    and ets:foldr/3 is now clearer about what will happen if
	    objects are inserted during table traversals.</p>
          <p>
	    Own Id: OTP-6928 Aux Id: seq10779 </p>
        </item>
        <item>
          <p>
	    It is now possible to extract files in tar files directly
	    into binaries. It is also possible to add files to tar
	    files directly from binaries.</p>
          <p>
	    Own Id: OTP-6943</p>
        </item>
        <item>
	    <p>The functions <c>keystore/4</c> and <c>keytake/3</c>
	    are new in the <c>lists</c> module.</p>
          <p>
	    Own Id: OTP-6953</p>
        </item>
        <item>
	    <p>The new <c>qlc</c> option <c>tmpdir_usage</c> can be
	    used for outputting messages onto the error logger when a
	    temporary file is about to be created, or to prohibit the
	    usage of temporary files altogether.</p>
          <p>
	    Own Id: OTP-6964</p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.14.5.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The allowed syntax for -type() and -spec() was updated.</p>
          <p>
	    Own Id: OTP-6861 Aux Id: OTP-6834 </p>
        </item>
      </list>
    </section>

</section>

<section><title>STDLIB 1.14.5.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            The compiler will for forward compatibility ignore the
            -type() and -spec() attributes that will be introduced in
            the R12B release.</p>
          <p>
            Own Id: OTP-6834</p>
        </item>
      </list>
    </section>

</section>
<section><title>STDLIB 1.14.5.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The log_mf_h event handler didn't close the index file
	    when it was done reading it causing a file descriptor
	    leak.</p>
          <p>
	    Own Id: OTP-6800</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The dict:size/1 and orddict:size/1 functions have been
	    documented.</p>
          <p>
	    Own Id: OTP-6818</p>
        </item>
      </list>
    </section>

</section>

  <section>
    <title>STDLIB 1.14.5</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Bugs have been fixed in Dets concerning comparison
            (==) and matching (=:=).</p>
          <p>The STDLIB manual pages
            have been updated as to more carefully state when terms
            are matched and when they are compared.</p>
          <p>Own Id: OTP-4738 Aux Id: OTP-4685 </p>
        </item>
        <item>
          <p>The shell has been updated to fix the following flaws:
            Shell process exit left you with an unresponsive initial
            shell if not using oldshell. Starting a restricted shell
            with a nonexisting callback module resulted in a shell
            where no commands could be used, not even init:stop/0.
            Fun's could not be used as parameters to local shell
            functions (in shell_default or user_default) when
            restricted_shell was active.</p>
          <p>Own Id: OTP-6537</p>
        </item>
        <item>
          <p>A bug in QLC's parse transform has been fixed.</p>
          <p>Own Id: OTP-6590</p>
        </item>
        <item>
          <p>A bug concerning <c>lists:sort/1</c> and
            <c>lists:keysort/2</c> and a mix of floating point
            numbers and integers has been fixed.</p>
          <p>Own Id: OTP-6606</p>
        </item>
        <item>
          <p>When calling <c>erlang:garbage_collect/0</c> in the
            Erlang shell not only the evaluator process (the one
            returned by calling <c>self()</c> in the Erlang shell) is
            garbage collected, but also the process holding the
            history list.</p>
          <p>Own Id: OTP-6659</p>
        </item>
        <item>
          <p>Functions of the <c>beam_lib</c> module that used to
            catch exceptions and return a tuple
            <c>{'EXIT',Reason}</c> now exit with the reason
            <c>Reason</c>.</p>
          <p>Own Id: OTP-6711</p>
        </item>
        <item>
          <p>The <c>erl_eval</c> module now calls the non-local
            function handler whenever an operator is evaluated
            (exceptions are <c>andalso</c>, <c>orelse</c>, and
            <c>catch</c>). The non-local function handler is now also
            called when the function or operator occurs in a guard
            test (such calls used to be ignored).</p>
          <p>These changes affect the Erlang shell when running in
            restricted mode: the callback function
            <c>non_local_allowed/3</c> is now called for operators
            such as <c>'!'/2</c>. This means that
            <c>non_local_allowed/3</c> may need to be changed as to
            let operators through. Note that <c>erlang:'!'/2</c> as
            well as <c>erlang:send/2,3</c> have to be restricted in
            order to stop message passing in the shell.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-6714 Aux Id: seq10374 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The new compiler option <c>warn_obsolete_guard</c> can
            be used for turning on warnings for calls to old type
            testing BIFs.</p>
          <p>Own Id: OTP-6585</p>
        </item>
        <item>
          <p>For scripts written using <c>escript</c>, there is a new
            function <c>escript:script_name/0</c>, which can be used
            to retrieve the pathame of the script. The documentation
            has been clarified regarding pre-defined macros such as
            ?MODULE and the module name.</p>
          <p>Own Id: OTP-6593</p>
        </item>
        <item>
          <p>Minor Makefile changes.</p>
          <p>Own Id: OTP-6689 Aux Id: OTP-6742 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.4</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The MD5 calculation of a BEAM file done by
            <c>code:module_md5/1</c>, <c>beam_lib:md5/1</c>, and by
            the compiler for the default value of the <c>vsn</c>
            attribute have all been changed so that its result will
            be the same on all platforms; modules containing funs
            could get different MD5s on different platforms.</p>
          <p>Own Id: OTP-6459</p>
        </item>
        <item>
          <p>When sorting terms using the <c>file_sorter</c> module
            (the option <c>Format</c> set to <c>term</c>), file
            errors were not always properly handled. This bug has
            been fixed.</p>
          <p>The directory supplied with the
            <c>tmpdir</c> option is no longer checked unless it is
            actually used. The error reason <c>not_a_directory</c>
            can no longer be returned; instead a <c>file_error</c>
            tuple is returned</p>
          <p>Own Id: OTP-6526</p>
        </item>
        <item>
          <p>Bugs regarding <c>try</c>/<c>catch</c> have been fixed
            in the <c>erl_eval</c> module.</p>
          <p>Own Id: OTP-6539</p>
        </item>
        <item>
          <p>When sorting the operands of a join operation, QLC
            called <c>file:open/3</c> with bad arguments. This bug
            has been fixed.</p>
          <p>Own Id: OTP-6562 Aux Id: seq10606 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The functions <c>beam_lib:cmp/1</c> and
            <c>beam_lib:strip/1</c> (and similar functions) have been
            updated to handle optional chunks (such as "FunT") in
            more general way in order to be future compatible.</p>
          <p>The function <c>beam_lib:chunks/3</c> has been
            added.</p>
          <p>The function <c>beam_lib:md5/1</c> has been added.</p>
          <p>Own Id: OTP-6443</p>
        </item>
        <item>
          <p>Added base64 as a module to stdlib, encoding and decoding</p>
          <p>Own Id: OTP-6470</p>
        </item>
        <item>
          <p>Added the functions to_upper/1 and to_lower/1 to the
            string module. These provide case conversion for ISO/IEC
            8859-1 characters (Latin1) and strings.</p>
          <p>Own Id: OTP-6472</p>
        </item>
        <item>
          <p>The callback function <c>non_local_allowed/3</c> used
            by the restricted shell can now return the value
            <c>{{restricted,NewFuncSpec,NewArgList},NewState}</c>
            which can be used for letting the shell call some other
            function than the one specified.</p>
          <p>Own Id: OTP-6497 Aux Id: seq10555 </p>
        </item>
        <item>
          <p>There is a new <c>escript</c> program that can be used
            for writing scripts in Erlang. Erlang scripts don't need
            to be compiled and any arguments can be passed to them
            without risk that they are interpreted by the Erlang
            system.</p>
          <p>Own Id: OTP-6505</p>
        </item>
        <item>
          <p>The <c>Format</c> argument of the functions
            <c>io:fwrite/2,3</c> and <c>io_lib:fwrite/2</c> is now
            allowed to be a binary.</p>
          <p>Own Id: OTP-6517</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.3.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The control sequences <c>p</c> and <c>P</c> of the
            <c>Format</c> argument of the functions
            <c>io:fwrite/2,3</c> and <c>io_lib:fwrite/2</c> could
            cause a <c>badarg</c> failure when applied to binaries.
            This bug was introduced in STDLIB 1.14.3. (Thanks to
            Denis Bilenko.)</p>
          <p>Own Id: OTP-6495</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Added the option {cwd, Dir} to make zip-archives with
            relative pathnames without having to do (a global)
            file:set_cwd.</p>
          <p>Own Id: OTP-6491 Aux Id: seq10551 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.3</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The <c>spawn_opt/2,3,4,5</c> option <c>monitor</c> --
            introduced in Kernel 2.11.2 -- is currently not possible
            to use when starting a process using <c>proc_lib</c>,
            that is, also when starting a gen_server, gen_fsm etc. </p>
          <p>This limitation has now been properly documented and the
            behavior of the <c>gen_fsm</c>, <c>gen_server</c>, and
            <c>proc_lib</c> <c>start</c> and <c>start_link</c>
            functions when providing this option has been changed
            from hanging indefinitely to failing with reason
            <c>badarg</c>.</p>
          <p>(Thanks to Fredrik Linder)</p>
          <p>Own Id: OTP-6345</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The control sequence <c>P</c> of the <c>Format</c>
            argument of the functions <c>io:fwrite/2,3</c> and
            <c>io_lib:fwrite/2</c> now replaces the tail of binary
            strings with <c>...</c> when the maximum depth has been
            reached. For instance, <c><![CDATA[io:fwrite("~P", [<<"a binary string">>, 3]).]]></c> prints <c><![CDATA[<<"a binary"...>>]]></c>.</p>
          <p>The indentation takes more care not to exceed the
            right margin, if possible.</p>
          <p>If the maximum depth is
            reached while printing a tuple, <c>,...</c> is printed
            instead of <c>|...</c> (this change applies to the
            control sequence <c>W</c> as well).</p>
          <p>Own Id: OTP-6354</p>
        </item>
        <item>
          <p>The Erlang shell command <c>h/0</c> that prints the
            history list now avoids printing (huge) terms referred to
            by <c>v/1</c> but instead just prints the call to
            <c>v/1</c>.</p>
          <p>Own Id: OTP-6390</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.2.2</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The functions <c>dets:select/1,3</c>,
            <c>dets:match/1,3</c>, and <c>dets:match_object/1,3</c>
            have been changed as to never return
            <c>{[],Continuation}</c>. This change affects the
            corresponding functions in Mnesia.</p>
          <p>Bugs have been
            fixed in QLC: <c>qlc:info()</c> could crash if the
            <c>tmpdir</c> option did not designate a valid directory;
            the results of looking up keys are kept in RAM, which
            should improve performance.</p>
          <p>Own Id: OTP-6359</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.2.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A bug in <c>erl_pp:exprs()</c> has been fixed.</p>
          <p>Own Id: OTP-6321 Aux Id: seq10497 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.2</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The control sequences <c>p</c> and <c>P</c> of the
            <c>Format</c> argument of the functions
            <c>io:format/2,3</c> and <c>io_lib:format/2</c> did not
            handle binaries very well. This bug, introduced in
            stdlib-1.14, has been fixed.</p>
          <p>Own Id: OTP-6230</p>
        </item>
        <item>
          <p><c>filelib:wildcard(Wc, PathWithRedundantSlashes)</c>,
            where <c>PathWithRedundantSlashes</c> is a directory path
            containing redundant slashes, such as <c>/tmp/</c> or
            <c>//tmp</c>, could return incorrect results. (Thanks to
            Martin Bjorklund.)</p>
          <p>Own Id: OTP-6271</p>
        </item>
        <item>
          <p>The Erlang code preprocessor crashed if the predefined
            macros ?MODULE or ?MODULE_STRING were used before the
            module declaration. This bug has been fixed.</p>
          <p>Own Id: OTP-6277</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Support for faster join of two tables has been added
            to the <c>qlc</c> module. There are two kinds of fast
            joins: lookup join that uses existing indices, and merge
            join that takes two sorted inputs. There is a new
            <c>join</c> option that can be used to force QLC to use a
            particular kind of join in some QLC expression.</p>
          <p>Several other changes have also been included:</p>
          <list type="bulleted">
            <item>
              <p>The new <c>tmpdir</c> option of <c>cursor/2</c>,
                <c>eval/2</c>, <c>fold/4</c>, and <c>info/2</c> can be
                used to set the directory that join uses for temporary
                files. The option also overrides the <c>tmpdir</c> option
                of <c>keysort/3</c> and <c>sort/2</c>.</p>
            </item>
            <item>
              <p>The new <c>lookup</c> option can be used to
                assert that constants are looked up when evaluating some
                QLC expression.</p>
            </item>
            <item>
              <p>The <c>cache</c> and <c>cache_all</c> options
                accept new tags: <c>ets</c>, <c>list</c>, and <c>no</c>.
                The tag <c>list</c> caches answers in a list using a
                temporary file if the answers cannot be held in RAM.
                Combining <c>{cache,list}</c> and <c>{unique, true}</c>
                is equivalent to calling <c>sort/2</c> with the option
                <c>unique</c> set to <c>true</c>. The old tags
                <c>true</c> (equivalent to <c>ets</c>) and <c>false</c>
                (equivalent to <c>no</c>) are recognized for backward
                compatibility.</p>
            </item>
            <item>
              <p>The new option <c>max_list_size</c> can be used
                to set the limit where merge join starts to use temporary
                files for large equivalence classes and when answers
                cached in lists are put on temporary files.</p>
            </item>
            <item>
              <p>There is a new callback <c>is_sorted_key</c> to
                be supplied as an option to <c>table/2</c>.</p>
            </item>
            <item>
              <p>QLC analyzes each and every QLC expression when
                trying to find constants for the lookup function.
                Hitherto only QLC expressions with exactly one generator
                were analyzed.</p>
              <p>Note that only filters with guard
                syntax placed immediately after the generator are
                analyzed. The restriction to guard filters is an
                incompatible change. See <c>qlc(3)</c> for further
                details.</p>
            </item>
            <item>
              <p>In a similar way several match specifications
                for traversal of QLC tables can be utilized for different
                generators of one single QLC expression.</p>
            </item>
            <item>
              <p>A bug has been fixed: when caching answers to a
                sufficiently complex query it could happen that some
                answers were not returned.</p>
            </item>
          </list>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-6038</p>
        </item>
        <item>
          <p>The Erlang pretty printer (<c>erl_pp</c>) is now much
            faster when the code is deeply nested. A few minor bugs
            have been fixed as well.</p>
          <p>Own Id: OTP-6227 Aux Id: OTP-5924 </p>
        </item>
        <item>
          <p>The Erlang shell now tries to garbage collect large
            binaries. Under certain circumstances such binaries could
            otherwise linger on for an indefinite amount of time.</p>
          <p>Own Id: OTP-6239</p>
        </item>
        <item>
          <p>To help Dialyzer find more bugs, many functions in the
            Kernel and STDLIB applications now only accept arguments
            of the type that is documented.</p>
          <p>For instance, the functions <c>lists:prefix/2</c> and
            <c>lists:suffix/2</c> are documented to only accept lists
            as their arguments, but they actually accepted anything
            and returned <c>false</c>. That has been changed so that
            the functions cause an exception if one or both arguments
            are not lists.</p>
          <p>Also, the <c>string:strip/3</c> function is documented
            to take a character argument that is a character to strip
            from one or both ends of the string. Given a list instead
            of a character, it used to do nothing, but will now cause
            an exception.</p>
          <p>Dialyzer will find most cases where those functions
            are passed arguments of the wrong type.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-6295</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The functions <c>c:y/1,2</c> which call
            <c>yecc:file/1,2</c> are now listed by
            <c>c:help/0</c>.</p>
          <p>Documentation of <c>c:y/1,2</c> has been added to
            <c>c(3)</c>.</p>
          <p>The fact that the control sequence character <c>s</c>
            recognizes binaries and deep character lists has been
            documented in <c>io(3)</c>. This feature was added in
            R11B-0 (OTP-5403).</p>
          <p>Own Id: OTP-6140</p>
        </item>
        <item>
          <p>The shell command rr() sometimes failed to read record
            definitions from file(s). This problem has been fixed.</p>
          <p>Own Id: OTP-6166 Aux Id: OTP-5878 </p>
        </item>
        <item>
          <p>The nonlocal function handler in <c>erl_eval</c>, which
            is used for implementing the restricted mode of the
            Erlang shell, did not handle calls to
            <c>erlang:apply/3</c> correctly. This bug has been fixed.</p>
          <p>Own Id: OTP-6169 Aux Id: seq10374 </p>
        </item>
        <item>
          <p>ets:rename/1 could deadlock, or crash the SMP emulator
            when the table wasn't a named table.</p>
          <p>ets:next/2, and ets:prev/2 could return erroneous results
            on the SMP emulator.</p>
          <p>Own Id: OTP-6198 Aux Id: seq10392, seq10415 </p>
        </item>
        <item>
          <p>When closing a Dets table the space management data was
            sometimes saved in such a way that opening the table
            could not be done without repairing the file. This bug
            has been fixed.</p>
          <p>Own Id: OTP-6206</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.14</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A bugfix in QLC: two of the call-back functions used
            for implementing QLC tables, <c>TraverseFun</c> and
            <c>LookupFun</c>, are now allowed to return a term other
            than a list. Such a term is immediately returned as the
            results of the current query, and is useful mostly for
            returning error tuples.</p>
          <p>Several other minor bugs have been also been fixed.</p>
          <p>Own Id: OTP-5195</p>
        </item>
        <item>
          <p>The STDLIB modules <c>error_logger_file_h</c> and
            <c>error_logger_tty_h</c> now read the environment
            variable <c>utc_log</c> from the SASL application.</p>
          <p>Own Id: OTP-5535</p>
        </item>
        <item>
          <p><c>ets:info/1</c> has been corrected to behave according
            to the documentation and return a list of tuples, not a
            tuple with tuples.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5639</p>
        </item>
        <item>
          <p>Referencing a so far undeclared record from the default
            value of some record declaration is from now on considered
            an error by the linter. It is also an error if the default
            value of a record declaration uses or binds a variable.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5878</p>
        </item>
        <item>
          <p>When a file <c>.hrl</c> file is included using
            <c>-include_lib</c>, the include path is temporarily
            updated to include the directory the <c>.hrl</c> file was
            found in, which will allow that <c>.hrl</c> file to itself
            include files from the same directory as itself using
            <c>-include</c>. (Thanks to Richard Carlsson.)</p>
          <p>Own Id: OTP-5944</p>
        </item>
        <item>
          <p>Corrected <c>filelib:ensure_dir/1</c> which sometimes
            returned <c>true</c> and sometimes <c>ok</c> to always
            return <c>ok</c> when successful. This goes against the
            documentation which said <c>true</c>, but <c>ok</c> was
            judged to be a more logical return value.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5960 Aux Id: seq10240 </p>
        </item>
        <item>
          <p>The shell now handles records better when used in calls
            on the form <c>{Module, Function}(ArgList)</c>.</p>
          <p>Own Id: OTP-5990 Aux Id: OTP-5876 </p>
        </item>
        <item>
          <p>The functions <c>lists:ukeysort/2</c> and
            <c>lists:ukeymerge/3</c> have been changed in such a way
            that two tuples are considered equal if their keys
            match.</p>
          <p>For the sake of consistency, <c>lists:usort/2</c> and
            <c>lists:umerge/3</c> have been modified too: two elements
            are considered equal if they compare equal.</p>
          <p>The <c>file_sorter</c> module has been modified in a
            similar way: the <c>unique</c> option now applies to the
            key (<c>keysort()</c> and <c>keymerge()</c>) and the
            ordering function (the option <c>{order, Order} </c>).</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-6019</p>
        </item>
        <item>
          <p>Correction in documentation for
            <c>ets:update_counter/3</c>; failure with <c>badarg</c>
            also if the counter to be updated is the key.</p>
          <p>Own Id: OTP-6072</p>
        </item>
        <item>
          <p>When sorting terms using the <c>file_sorter</c> module
            and an ordering fun, the sort was not always stable. This
            bug has been fixed.</p>
          <p>Own Id: OTP-6088</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Improvements of the linter:</p>
          <list type="bulleted">
            <item>
              <p>The <c>compile</c> attribute is recognized after
                function definitions.</p>
            </item>
            <item>
              <p>The new compiler option
                <c>nowarn_deprecated_function</c> can be used for
                turning off warnings for calls to deprecated functions.</p>
            </item>
            <item>
              <p>The new compiler option
                <c>{nowarn_unused_function,[{Name,Arity}]}</c> turns off
                warnings for unused local functions for the mentioned
                functions. The new options
                <c>{nowarn_deprecated_function,[{Module,Name,Arity}]}</c>
                and <c>{nowarn_bif_clash,[{Name,Arity}]}</c> work
                similarly.</p>
            </item>
          </list>
          <p>The Erlang code preprocessor <c>epp</c> now recognizes
            the <c>file</c> attribute. This attribute is meant to be
            used by tools such as Yecc that generate source code
            files.</p>
          <p>Own Id: OTP-5362</p>
        </item>
        <item>
          <p>The formatting option <c>~s</c> of <c>io:fwrite</c> and
            <c>io_lib:fwrite</c> has been extended to handle arguments
            that are binaries or I/O lists.</p>
          <p>Own Id: OTP-5403</p>
        </item>
        <item>
          <p>The control sequences <c>p</c> and <c>P</c> of the
            <c>Format</c> argument of the functions
            <c>io:format/2,3</c> and <c>io_lib:format/2</c> have been
            changed as to display the contents of binaries containing
            printable characters as strings.</p>
          <p>Own Id: OTP-5485</p>
        </item>
        <item>
          <p>The linter emits warnings for functions exported more
            than once in <c>export</c> attributes.</p>
          <p>Own Id: OTP-5494</p>
        </item>
        <item>
          <p>A manual for STDLIB has been added, <c>stdlib(6)</c>. It
            mentions the configuration parameters for the Erlang
            shell.</p>
          <p>Own Id: OTP-5530</p>
        </item>
        <item>
          <p>Added the <c>zip</c> module with functions for reading
            and creating zip archives. See <c>zip(3)</c>.</p>
          <p>Own Id: OTP-5786</p>
        </item>
        <item>
          <p>Simple-one-for-one supervisors now store the pids of
            child processes using <c>dict</c> instead of a list. This
            significantly improves performance when there are many
            dynamic supervised child processes. (Thanks to Micka&euml;l
            R&eacute;mond et al.)</p>
          <p>Own Id: OTP-5898</p>
        </item>
        <item>
          <p>When given the new option '<c>strict_record_tests</c>',
            the compiler will generate code that verifies the record
            type for '<c>R#record.field</c>' operations in guards. Code
            that verifies record types in bodies has already been
            generated since R10B, but in this release there will be a
            '<c>{badrecord,RecordTag}</c>' instead of a
            '<c>badmatch</c>' if the record verification test fails.
            See the documentation for the <c>compile</c> module for
            more information.</p>
          <p>The Erlang shell always applies strict record tests.</p>
          <p>Own Id: OTP-5915 Aux Id: OTP-5714 </p>
        </item>
        <item>
          <p>The Erlang pretty printer (<c>erl_pp</c>) now tries to
            insert line breaks at appropriate places.</p>
          <p>Own Id: OTP-5924</p>
        </item>
        <item>
          <p>The <c>public</c> option has been removed from
            <c>digraph:new/1</c>. The reason is that several
            functions in the <c>digraph</c> module are implemented
            using multiple ETS accesses, which is not thread safe.
            (Thanks to Ulf Wiger.)</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5985</p>
        </item>
        <item>
          <p>The function <c>lists:keyreplace/4</c> checks that the
            fourth argument (<c>NewTuple</c>) is a tuple.</p>
          <p>Own Id: OTP-6023</p>
        </item>
        <item>
          <p>Added an example of how to reconstruct source code from
            debug info (abstract code) to <c>beam_lib(3)</c>. (Thanks
            to Mats Cronqvist who wrote the example.)</p>
          <p>Own Id: OTP-6073</p>
        </item>
        <item>
          <p>The new compiler option <c>warn_unused_record</c> is used
            for finding unused locally defined record types.</p>
          <p>Own Id: OTP-6105</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.12</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p><c>shell_default:xm/1</c> has been added. It calls
            <c>xref:m/1</c>.</p>
          <p>Own Id: OTP-5405 Aux Id: OTP-4101 </p>
        </item>
        <item>
          <p>Warnings are output whenever so far undeclared records are
            referenced from some default value of a record
            declaration. In STDLIB 1.14 (R11B) such forward references
            will cause a compilation error.</p>
          <p>Own Id: OTP-5878</p>
        </item>
        <item>
          <p>The linter's check of the <c>deprecated</c> attribute did
            not take the compile option <c>export_all</c> into
            account. This bug has been fixed.</p>
          <p>Own Id: OTP-5917</p>
        </item>
        <item>
          <p>The Erlang pretty printer did not handle <c>try/catch</c>
            correctly. This bug has been fixed.</p>
          <p>Own Id: OTP-5926</p>
        </item>
        <item>
          <p>Corrected documentation for <c>lists:nthtail/3</c>.</p>
          <p>Added documentation for <c>lists:keymap/3</c>.</p>
          <p>Tried to clarify some other type declarations and
            function descriptions in <c>lists(3)</c>.</p>
          <p>Corrected documentation for <c>timer:now_diff/2</c>.</p>
          <p>Fixed broken links in <c>gen_fsm(3)</c>,
            <c>gen_server(3)</c>, <c>io_lib(3)</c> and <c>lib(3)</c>.</p>
          <p>Own Id: OTP-5931</p>
        </item>
        <item>
          <p>Type checks have been added to functions in
            <c>lists.erl</c>.</p>
          <p>Own Id: OTP-5939</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The new STDLIB module <c>erl_expand_records</c> expands
            records in abstract code. It is used by the Erlang shell,
            which means that Compiler is no longer used by the shell.</p>
          <p>Own Id: OTP-5876 Aux Id: OTP-5435 </p>
        </item>
        <item>
          <p>The compiler will now warn that the
            <c>megaco:format_versions/1</c> function is deprecated.</p>
          <p>Own Id: OTP-5976</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.11</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>When calling <c>gen_server:enter_loop</c> with a
            registered server name, it was only checked that the
            registered name existed, not that it actually was the
            name of the calling process.</p>
          <p>Own Id: OTP-5854</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>More detail on <c>beam_lib:version/1</c> in
            documentation.</p>
          <p>Own Id: OTP-5789</p>
        </item>
        <item>
          <p>The new function <c>io:read/3</c> works like
            <c>io:read/1,2</c> but takes a third argument,
            <c>StartLine</c>.</p>
          <p>Own Id: OTP-5813</p>
        </item>
        <item>
          <p>The new function <c>gen_fsm:enter_loop/4,5,6</c>, similar
            to <c>gen_server:enter_loop/3,4,5</c>, has been added.</p>
          <p>Own Id: OTP-5846 Aux Id: seq10163 </p>
        </item>
        <item>
          <p>The function <c>c:i/1</c> is now exported.</p>
          <p>Own Id: OTP-5848 Aux Id: seq10164 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.10</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A couple of type errors have been fixed in <c>sofs</c>.</p>
          <p>Own Id: OTP-5739</p>
        </item>
        <item>
          <p>The pre-processor used to complain that the macro
            definition '<c>-define(S(S), ??S).</c>' was circular,
            which it isn't. (Thanks to Richard Carlsson.)</p>
          <p>Own Id: OTP-5777</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.9</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The linter, QLC and the module <c>erl_pp</c> did not
            handle the new '<c>fun M:F/A</c>' construct in all
            situations. This problem has been fixed.</p>
          <p>Own Id: OTP-5644</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The manual pages for most of the Kernel and some of
            the STDLIB modules have been updated, in particular
            regarding type definitions.</p>
          <p>The documentation of the return value for
            <c>erts:info/1</c> has been corrected.</p>
          <p>The documentation for <c>erlang:statistics/1</c> now
            lists all possible arguments.</p>
          <p>Own Id: OTP-5360</p>
        </item>
        <item>
          <p>Replaced some tuple funs with the new <c>fun M:F/A</c>
            construct.</p>
          <p>The high-order functions in the lists module no longer
            accept bad funs under any circumstances.
            '<c>lists:map(bad_fun, [])</c>' used to return
            '<c>[]</c>' but now causes an exception.</p>
          <p>Unused, broken compatibility code in the <c>ets</c>
            module was removed. (Thanks to Dialyzer.)</p>
          <p>Eliminated 5 discrepancies found by Dialyzer in the
            Appmon application.</p>
          <p>Own Id: OTP-5633</p>
        </item>
        <item>
          <p>The <c>c:i/0</c> function will now run in a paged mode if
            there are more than 100 processes in the system. (Thanks
            to Ulf Wiger.)</p>
          <p><c>erlang:system_info(process_count)</c> has been
            optimized and does now return exactly the same value as
            <c>length(processes())</c>. Previously
            <c>erlang:system_info(process_count)</c> did not include
            exiting processes which are included in
            <c>length(processes())</c>.</p>
          <p>The <c>+P</c> flag for <c>erl</c>, which sets the maximum
            number of processes allowed to exist at the same, no longer
            accepts values higher than 134217727. (You will still
            probably run out of memory before you'll be able to reach
            that limit.)</p>
          <p>Own Id: OTP-5645 Aux Id: seq9984 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.8</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Very minor corrections in <c>beam_lib</c> and its
            documentation.</p>
          <p>Own Id: OTP-5589</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The <c>erlang:port_info/1</c> BIF is now documented.
            Minor corrections of the documentation for
            <c>erlang:port_info/2</c>.</p>
          <p>Added a note to the documentation of the <c>math</c>
            module that all functions are not available on all
            platforms.</p>
          <p>Added more information about the '<c>+c</c>' option in
            the <c>erl</c> man page in the ERTS documentation.</p>
          <p>Own Id: OTP-5555</p>
        </item>
        <item>
          <p>The new <c>fun M:F/A</c> construct creates a fun that
            refers to the latest version of <c>M:F/A</c>. This syntax is
            meant to replace tuple funs <c>{M,F}</c> which have many
            problems.</p>
          <p>The new type test <c>is_function(Fun,A)</c> (which may be
            used in guards) test whether <c>Fun</c> is a fun that can be
            applied with <c>A</c> arguments. (Currently, <c>Fun</c> can
            also be a tuple fun.)</p>
          <p>Own Id: OTP-5584</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.7</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p><c>filelib:wildcard/2</c> was broken (it ignored its
            second argument).</p>
          <p>Also, <c>filelib:wildcard("Filename")</c> (where the
            argument does not contain any meta-characters) would
            always return <c>["Filename"]</c>. Corrected so that an
            empty list will be returned if <c>"Filename"</c> does not
            actually exist. (Same correction in
            <c>filelib:wildcard/2</c>.) (This change is a slight
            incompatibility.)</p>
          <p><c>filelib:wildcard/1,2</c> will generate a different
            exception when given bad patterns such as <c>"{a,"</c>. The
            exception used to be caused by
            '<c>exit(missing_delimiter)</c>' but is now
            '<c>erlang:error({badpattern,missing_delimiter})</c>'.</p>
          <p>Own Id: OTP-5523 Aux Id: seq9824 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Further improvements of encrypted debug info: New option
            <c>encrypt_debug_info</c> for compiler.</p>
          <p>Own Id: OTP-5541 Aux Id: seq9837 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.6</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>When opening a Dets table read only an attempt was
            sometimes made to re-hash the table resulting in an error
            message. This problem has been fixed.</p>
          <p>Own Id: OTP-5487 Aux Id: OTP-4989 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>It is now possible to encrypt the debug information in
            Beam files, to help keep the source code secret. See the
            documentation for <c>compile</c> on how to provide the key
            for encrypting, and the documentation for <c>beam_lib</c>
            on how to provide the key for decryption so that tools such
            as the Debugger, Xref, or Cover can be used.</p>
          <p>The <c>beam_lib:chunks/2</c> functions now accepts an
            additional chunk type <c>compile_info</c> to retrieve
            the compilation information directly as a term. (Thanks
            to Tobias Lindahl.)</p>
          <p>Own Id: OTP-5460 Aux Id: seq9787 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.5</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Closing a Dets table kept in RAM would cause a crash if
            the file could not be written. This problem has been
            fixed by returning an error tuple.</p>
          <p>Own Id: OTP-5402</p>
        </item>
        <item>
          <p><c>erl_pp</c> now correctly pretty-prints <c>fun F/A</c>.</p>
          <p>Own Id: OTP-5412</p>
        </item>
        <item>
          <p>The Erlang shell failed if the compiler was not in the
            code path. This problem has been fixed, but in order to
            evaluate records the compiler is still needed.</p>
          <p>Own Id: OTP-5435</p>
        </item>
        <item>
          <p>Corrected the example in the documentation for
            <c>ets:match/2</c>. Also clarified that
            <c>ets:update_counter/3</c> updates the counter atomically.
            (Thanks to Anders Svensson.)</p>
          <p>Own Id: OTP-5452 Aux Id: seq9770, seq9789 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The possibility to start the Erlang shell in parallel
            with the rest of the system was reintroduced for
            backwards compatibility in STDLIB 1.13.1. The flag to be
            used for this is now called <c>async_shell_start</c> and has
            been documented. New shells started from the JCL menu are
            not synchronized with <c>init</c> anymore. This makes it
            possible to start a new shell (e.g. for debugging purposes)
            even if the initial shell has not come up.</p>
          <p>Own Id: OTP-5406 Aux Id: OTP-5218 </p>
        </item>
        <item>
          <p>The compiler will now produce warnings when using the
            deprecated functions in the <c>snmp</c> module.</p>
          <p>Own Id: OTP-5425</p>
        </item>
        <item>
          <p>The function <c>c:zi/0</c> has been removed. Use
            <c>c:i/0</c> instead.</p>
          <p>Own Id: OTP-5432</p>
        </item>
        <item>
          <p>Corrected two minor bugs found by the Dialyzer:
            Calling a parameterized module from a restricted shell
            (i.e. if <c>shell:start_restricted/1</c> has been used)
            would crash the shell evaluator. A debug printout in
            <c>gen_fsm</c> had a clause that would never match; causing
            less information to be printed.</p>
          <p>And a somewhat more serious one also found by
            Dialyzer: <c>rpc:yield/1</c> would crash unless the call
            started by <c>rpc:async_call/4</c> had already finished;
            <c>rpc:nb_yield(Key,infinity)</c> would also crash.</p>
          <p>Cleaned up and removed redundant code found by
            Dialyzer in <c>erlang:dmonitor_p/2</c>.</p>
          <p>Own Id: OTP-5462</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.4</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Bugs in the Erlang shell have been fixed.</p>
          <p>Own Id: OTP-5327</p>
        </item>
        <item>
          <p>Some dead code reported by Dialyzer was eliminated.</p>
          <p>A bug in <c>dbg</c> when tracing to wrap trace files has
            been corrected. It failed to delete any already existing
            wrap trace files with the same names when starting a new
            wrap trace.</p>
          <p>Own Id: OTP-5329</p>
        </item>
        <item>
          <p>The linter could output invalid warnings about bit
            patterns in record initializations. This problem has been
            fixed.</p>
          <p>Own Id: OTP-5338</p>
        </item>
        <item>
          <p><c>ordsets:is_set(NoList)</c>, where <c>NoList</c> is any
            term except a list, would crash. For consistency with
            <c>sets:is_set/1</c> and <c>gb_sets:is_set/1</c>, it now
            returns <c>false</c>.</p>
          <p>Own Id: OTP-5341</p>
        </item>
        <item>
          <p>A BIF <c>erlang:raise/3</c> has been added. See the manual
            for details. It is intended for internal system programming
            only, advanced error handling.</p>
          <p>Own Id: OTP-5376 Aux Id: OTP-5257 </p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The <c>deprecated</c> attribute is now checked by the
            linter. See <c>xref(3)</c> for a description of the
            <c>deprecated</c> attribute.</p>
          <p>Own Id: OTP-5276</p>
        </item>
        <item>
          <p>The restricted shell will now indicate if the return
            value from a user predicate is on an incorrect form.</p>
          <p>Own Id: OTP-5335</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.3</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Bugs concerning unused and shadowed variables have been
            fixed in the linter.</p>
          <p>Own Id: OTP-5091</p>
        </item>
        <item>
          <p>A bug in the evaluator that caused the shell to choke on
            bit syntax expressions has been fixed.</p>
          <p>Own Id: OTP-5237</p>
        </item>
        <item>
          <p><c>io:format/2</c> et.al no longer crashes for some
            combinations of precision and value for format character
            "g". Previously it crashed if the precision P was 4 or lower
            and the absolute value of the float to print was lower
            than 10^4 but 10^(P-1) or higher. Now it will not crash
            depending on the value of the float.</p>
          <p>Own Id: OTP-5263</p>
        </item>
        <item>
          <p>Bugs in the handling of the bit syntax have been fixed in
            the Erlang shell.</p>
          <p>Own Id: OTP-5269</p>
        </item>
        <item>
          <p><c>gb_sets:del_element/2</c> was changed to do the
            same as <c>gb_sets:delete_any/2</c> which was the
            original intention, not as <c>gb_sets:delete/2</c>. Code
            that relies on <c>gb_sets:del_element/2</c> causing an
            error if the element does not exist must be changed to
            call <c>gb_sets:delete/2</c> instead.</p>
          <p>The documentation was also updated to explicitly
            document functions that were only referred to as
            'aliases' of a documented function. Also, a list of all
            functions common to the <c>gb_sets</c>, <c>sets</c>, and
            <c>ordsets</c> was added.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5277</p>
        </item>
        <item>
          <p>Debug messages have been removed from the QLC module.</p>
          <p>Own Id: OTP-5283</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The size of continuations returned from
            <c>dets:match/1,3</c>, <c>dets:match_object/1,3</c>, and
            <c>dets:select/1,3</c> has been reduced. This affects the
            amount of data Mnesia sends between nodes while
            evaluating QLC queries.</p>
          <p>Own Id: OTP-5232</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.2</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>The <c>-rsh</c> switch for starting a remote shell
            (introduced with OTP-5210) clashed with an already existing
            switch used by <c>slave</c>. Therefore the switch for
            the remote shell is now instead named <c>-remsh</c>.</p>
          <p>Own Id: OTP-5248 Aux Id: OTP-5210 </p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>STDLIB 1.13.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>The Pman 'trace shell' functionality was broken as has
            now been fixed. Furthermore, Pman could not correctly
            find the pid of the active shell if more than one shell
            process was running on the node. This has also been
            corrected.</p>
          <p>Own Id: OTP-5191</p>
        </item>
        <item>
          <p>When the undocumented feature "parameterized modules" was
            used, the ?MODULE macro did not work correctly.</p>
          <p>Own Id: OTP-5224</p>
        </item>
      </list>
    </section>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>You can now start Erlang with the <c>-rsh</c> flag which
            gives you a remote initial shell instead of a local one.
            Example:</p>
          <pre>
            erl -sname this_node -rsh other_node@other_host
          </pre>
          <p>Own Id: OTP-5210</p>
        </item>
        <item>
          <p>The man page for the <c>lists</c> module has been updated
            with description of the new <c>zip</c>, <c>unzip</c>,
            and <c>partition/2</c> functions.</p>
          <p>Own Id: OTP-5213</p>
        </item>
        <item>
          <p>The top level group leader used to be listed as job #1 in
            the job list in JCL mode. Since there is no shell
            associated with this process that can be connected to, it
            will no longer be listed.</p>
          <p>Own Id: OTP-5214</p>
        </item>
        <item>
          <p>The possibility to start the Erlang shell in parallel
            with the rest of the system has been reintroduced for
            backwards compatibility. Note that this old behaviour is
            error prone and should not be used unless for some reason
            necessary.</p>
          <p>Own Id: OTP-5218 Aux Id: seq9534 </p>
        </item>
        <item>
          <p>The <c>shell</c> commands <c>rr/1,2,3</c> now accepts
            wildcards when reading record definitions from BEAM
            files.</p>
          <p>Own Id: OTP-5226</p>
        </item>
      </list>
    </section>
  </section>
</chapter>