stdlib: Correct signatures of functions in erl_parse

The signatures of erl_parse:anno_to_term/1 and
erl_parse:anno_from_term/1 are corrected. Using these function no
longer results in false Dialyzer warnings.

2 files changed, 25 insertions, 3 deletions

diff --git a/lib/dialyzer/test/small_SUITE_data/src/anno.erl b/lib/dialyzer/test/small_SUITE_data/src/anno.erl
new file mode 100644
index 0000000000..70f1d42141
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/anno.erl
@@ -0,0 +1,18 @@
+-module(anno).
+
+%% OTP-14131
+
+-export([t1/0, t2/0, t3/0]).
+
+t1() ->
+    A = erl_parse:anno_from_term({attribute, 1, module, my_test}),
+    compile:forms([A], []).
+
+t2() ->
+    A = erl_parse:new_anno({attribute, 1, module, my_test}),
+    compile:forms([A], []).
+
+t3() ->
+    A = erl_parse:new_anno({attribute, 1, module, my_test}),
+    T = erl_parse:anno_to_term(A),
+    {attribute, 1, module, my_test} = T.
diff --git a/lib/stdlib/src/erl_parse.yrl b/lib/stdlib/src/erl_parse.yrl
index 5656155c53..d2dd2848b5 100644
--- a/lib/stdlib/src/erl_parse.yrl
+++ b/lib/stdlib/src/erl_parse.yrl
@@ -2,7 +2,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 1996-2016. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2017. All Rights Reserved.
 %%
 %% Licensed under the Apache License, Version 2.0 (the "License");
 %% you may not use this file except in compliance with the License.
@@ -1558,13 +1558,17 @@ new_anno(Term) ->
       Abstr :: erl_parse_tree().
 
 anno_to_term(Abstract) ->
-    map_anno(fun erl_anno:to_term/1, Abstract).
+    F = fun(Anno, Acc) -> {erl_anno:to_term(Anno), Acc} end,
+    {NewAbstract, []} = modify_anno1(Abstract, [], F),
+    NewAbstract.
 
 -spec anno_from_term(Term) -> erl_parse_tree() when
       Term :: term().
 
 anno_from_term(Term) ->
-    map_anno(fun erl_anno:from_term/1, Term).
+    F = fun(T, Acc) -> {erl_anno:from_term(T), Acc} end,
+    {NewTerm, []} = modify_anno1(Term, [], F),
+    NewTerm.
 
 %% Forms.
 %% Recognize what sys_pre_expand does: