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-rw-r--r--lib/compiler/src/sys_core_fold.erl9
-rw-r--r--lib/compiler/test/guard_SUITE.erl4
2 files changed, 13 insertions, 0 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 4ef345f563..6fdeea51d1 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2362,6 +2362,15 @@ is_safe_bool_expr_1(#c_call{module=#c_literal{val=erlang},
%% been rewritten to is_record(Expr, LiteralTag, TupleSize).
false;
is_safe_bool_expr_1(#c_call{module=#c_literal{val=erlang},
+ name=#c_literal{val=is_function},
+ args=[A,#c_literal{val=Arity}]},
+ Sub, _BoolVars) when is_integer(Arity), Arity >= 0 ->
+ is_safe_simple(A, Sub);
+is_safe_bool_expr_1(#c_call{module=#c_literal{val=erlang},
+ name=#c_literal{val=is_function}},
+ _Sub, _BoolVars) ->
+ false;
+is_safe_bool_expr_1(#c_call{module=#c_literal{val=erlang},
name=#c_literal{val=Name},args=Args},
Sub, BoolVars) ->
NumArgs = length(Args),
diff --git a/lib/compiler/test/guard_SUITE.erl b/lib/compiler/test/guard_SUITE.erl
index a0a9bb7ddd..2d9e8d1ac0 100644
--- a/lib/compiler/test/guard_SUITE.erl
+++ b/lib/compiler/test/guard_SUITE.erl
@@ -1023,6 +1023,10 @@ is_function_2(Config) when is_list(Config) ->
true = is_function(id(fun() -> ok end), 0),
false = is_function(id(fun ?MODULE:all/1), 0),
false = is_function(id(fun() -> ok end), 1),
+ {'EXIT',{badarg,_}} =
+ (catch is_function(id(fun() -> ok end), -1) orelse error),
+ {'EXIT',{badarg,_}} =
+ (catch is_function(id(fun() -> ok end), '') orelse error),
F = fun(_) -> ok end,
if