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-rw-r--r--lib/compiler/src/v3_core.erl2
-rw-r--r--lib/compiler/test/map_SUITE.erl3
2 files changed, 4 insertions, 1 deletions
diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index 0941ad5dd5..7d93e2ae16 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -804,7 +804,7 @@ map_op(map_field_assoc) -> #c_literal{val=assoc};
map_op(map_field_exact) -> #c_literal{val=exact}.
is_valid_map_src(#c_literal{val = M}) when is_map(M) -> true;
-is_valid_map_src(#c_var{}) -> true;
+is_valid_map_src(#c_var{}=Var) -> not cerl:is_c_fname(Var);
is_valid_map_src(_) -> false.
%% try_exception([ExcpClause], St) -> {[ExcpVar],Handler,St}.
diff --git a/lib/compiler/test/map_SUITE.erl b/lib/compiler/test/map_SUITE.erl
index 411b15eebe..cff3b5deb4 100644
--- a/lib/compiler/test/map_SUITE.erl
+++ b/lib/compiler/test/map_SUITE.erl
@@ -883,6 +883,9 @@ t_update_map_expressions(Config) when is_list(Config) ->
%% Error cases.
{'EXIT',{{badmap,<<>>},_}} = (catch (id(<<>>))#{ a := 42, b => 2 }),
{'EXIT',{{badmap,[]},_}} = (catch (id([]))#{ a := 42, b => 2 }),
+ {'EXIT',{{badmap,_},_}} =
+ (catch (fun t_update_map_expressions/1)#{u => 42}),
+
ok.