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-rw-r--r--lib/compiler/test/map_SUITE.erl11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/compiler/test/map_SUITE.erl b/lib/compiler/test/map_SUITE.erl
index dc880a7a9d..cad6ac6887 100644
--- a/lib/compiler/test/map_SUITE.erl
+++ b/lib/compiler/test/map_SUITE.erl
@@ -179,6 +179,17 @@ t_update_map_expressions(Config) when is_list(Config) ->
#{ a :=42, b:=42, c:=42 } = (maps:from_list([{a,1},{b,2},{c,3}]))#{ a := 42, b := 42, c := 42 },
#{ "a" :=1, "b":=42, "c":=42 } = (maps:from_list([{"a",1},{"b",2}]))#{ "b" := 42, "c" => 42 },
+ %% Test need to be in a fun.
+ %% This tests that let expr optimisation in sys_core_fold
+ %% covers maps correctly.
+ F = fun() ->
+ M0 = id(#{ "a" => [1,2,3] }),
+ #{ "a" := _ } = M0,
+ M0#{ "a" := b }
+ end,
+
+ #{ "a" := b } = F(),
+
%% Error cases, FIXME: should be 'badmap'?
{'EXIT',{badarg,_}} = (catch (id(<<>>))#{ a := 42, b => 2 }),
{'EXIT',{badarg,_}} = (catch (id([]))#{ a := 42, b => 2 }),