stdlib: Correct the linter's check of map guard expressions

The check is used by evaluating modules such as erl_eval.

An example: "if map_size(#{}) =:= 0 -> ok end.".

1 files changed, 53 insertions, 3 deletions

diff --git a/lib/stdlib/test/erl_eval_SUITE.erl b/lib/stdlib/test/erl_eval_SUITE.erl
index 8eb85cab8e..f4019d477b 100644
--- a/lib/stdlib/test/erl_eval_SUITE.erl
+++ b/lib/stdlib/test/erl_eval_SUITE.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1998-2017. All Rights Reserved.
+%% Copyright Ericsson AB 1998-2018. 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.
@@ -47,7 +47,8 @@
 	 eval_expr_5/1,
 	 zero_width/1,
          eep37/1,
-         eep43/1]).
+         eep43/1,
+         otp_15035/1]).
 
 %%
 %% Define to run outside of test server
@@ -87,7 +88,7 @@ all() ->
      otp_6539, otp_6543, otp_6787, otp_6977, otp_7550,
      otp_8133, otp_10622, otp_13228, otp_14826,
      funs, try_catch, eval_expr_5, zero_width,
-     eep37, eep43].
+     eep37, eep43, otp_15035].
 
 groups() -> 
     [].
@@ -1606,6 +1607,55 @@ eep43(Config) when is_list(Config) ->
     error_check("(#{})#{nonexisting:=value}.", {badkey,nonexisting}),
     ok.
 
+otp_15035(Config) when is_list(Config) ->
+    check(fun() ->
+                  fun() when #{} ->
+                          a;
+                     () when #{a => b} ->
+                          b;
+                     () when #{a => b} =:= #{a => b} ->
+                          c
+                  end()
+          end,
+          "fun() when #{} ->
+                   a;
+              () when #{a => b} ->
+                   b;
+              () when #{a => b} =:= #{a => b} ->
+                   c
+           end().",
+          c),
+    check(fun() ->
+                  F = fun(M) when M#{} ->
+                              a;
+                         (M) when M#{a => b} ->
+                              b;
+                         (M) when M#{a := b} ->
+                              c;
+                         (M) when M#{a := b} =:= M#{a := b} ->
+                              d;
+                         (M) when M#{a => b} =:= M#{a => b} ->
+                              e
+                      end,
+                  {F(#{}), F(#{a => b})}
+          end,
+          "fun() ->
+                  F = fun(M) when M#{} ->
+                              a;
+                         (M) when M#{a => b} ->
+                              b;
+                         (M) when M#{a := b} ->
+                              c;
+                         (M) when M#{a := b} =:= M#{a := b} ->
+                              d;
+                         (M) when M#{a => b} =:= M#{a => b} ->
+                              e
+                      end,
+                  {F(#{}), F(#{a => b})}
+          end().",
+          {e, d}),
+    ok.
+
 %% Check the string in different contexts: as is; in fun; from compiled code.
 check(F, String, Result) ->
     check1(F, String, Result),