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-rw-r--r--lib/compiler/test/warnings_SUITE.erl44
1 files changed, 42 insertions, 2 deletions
diff --git a/lib/compiler/test/warnings_SUITE.erl b/lib/compiler/test/warnings_SUITE.erl
index 6e5a7d35e9..d59c89b264 100644
--- a/lib/compiler/test/warnings_SUITE.erl
+++ b/lib/compiler/test/warnings_SUITE.erl
@@ -39,7 +39,7 @@
guard/1,bad_arith/1,bool_cases/1,bad_apply/1,
files/1,effect/1,bin_opt_info/1,bin_construction/1,
comprehensions/1,maps/1,redundant_boolean_clauses/1,
- latin1_fallback/1]).
+ latin1_fallback/1,underscore/1]).
% Default timetrap timeout (set in init_per_testcase).
-define(default_timeout, ?t:minutes(2)).
@@ -64,7 +64,8 @@ groups() ->
[pattern,pattern2,pattern3,pattern4,guard,
bad_arith,bool_cases,bad_apply,files,effect,
bin_opt_info,bin_construction,comprehensions,maps,
- redundant_boolean_clauses,latin1_fallback]}].
+ redundant_boolean_clauses,latin1_fallback,
+ underscore]}].
init_per_suite(Config) ->
Config.
@@ -678,6 +679,45 @@ latin1_fallback(Conf) when is_list(Conf) ->
ok.
+underscore(Config) when is_list(Config) ->
+ S0 = <<"f(A) ->
+ _VAR1 = <<A>>,
+ _VAR2 = {ok,A},
+ _VAR3 = [A],
+ ok.
+ g(A) ->
+ _VAR1 = A/0,
+ _VAR2 = date(),
+ ok.
+ h() ->
+ _VAR1 = fun() -> ok end,
+ ok.
+ i(A) ->
+ _VAR1 = #{A=>42},
+ ok.
+ ">>,
+ Ts0 = [{underscore0,
+ S0,
+ [],
+ {warnings,[{2,sys_core_fold,useless_building},
+ {3,sys_core_fold,useless_building},
+ {4,sys_core_fold,useless_building},
+ {7,sys_core_fold,result_ignored},
+ {8,sys_core_fold,{no_effect,{erlang,date,0}}},
+ {11,sys_core_fold,useless_building},
+ {14,sys_core_fold,useless_building}
+ ]}}],
+ [] = run(Config, Ts0),
+
+ %% Replace all "_VAR<digit>" variables with a plain underscore.
+ %% Now there should be no warnings.
+ S1 = re:replace(S0, "_VAR\\d+", "_", [global]),
+ io:format("~s\n", [S1]),
+ Ts1 = [{underscore1,S1,[],[]}],
+ [] = run(Config, Ts1),
+
+ ok.
+
%%%
%%% End of test cases.
%%%