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</header>
<p>This document describes the changes made to the STDLIB application.</p>
+<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>
+ <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>
+ <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: <taglist> <item><c>M0 =
+ #{ a =&gt; 1, b =&gt; 2}, % create
+ associations</c></item> <item><c>M1 = M0#{ a := 10 }, %
+ update values</c></item> <item><c>M2 = M1#{ "hi" =&gt;
+ "hello"}, % add new associations</c></item> <item><c>#{
+ "hi" := V1, a := V2, b := V3} = M2. % match keys with
+ values</c></item> </taglist></p>
+ <p>
+ For information on how to use Maps please see the
+ <seealso marker="doc/reference_manual:maps">Reference
+ Manual</seealso>.</p>
+ <p>
+ The current implementation is without the following
+ features: <taglist> <item>No variable keys</item>
+ <item>No single value access</item> <item>No map
+ comprehensions</item> </taglist></p>
+ <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>