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-rw-r--r--lib/compiler/src/cerl_trees.erl16
1 files changed, 12 insertions, 4 deletions
diff --git a/lib/compiler/src/cerl_trees.erl b/lib/compiler/src/cerl_trees.erl
index 6d38748964..b3decbec1f 100644
--- a/lib/compiler/src/cerl_trees.erl
+++ b/lib/compiler/src/cerl_trees.erl
@@ -61,6 +61,7 @@
map_arg/1, map_es/1,
ann_c_map/3,
update_c_map/3,
+ is_c_map_pattern/1, ann_c_map_pattern/2,
map_pair_key/1,map_pair_val/1,map_pair_op/1,
ann_c_map_pair/4,
update_c_map_pair/4
@@ -752,10 +753,17 @@ label(T, N, Env) ->
{As, N2} = label_ann(T, N1),
{ann_c_tuple_skel(As, Ts), N2};
map ->
- {M, N1} = label(map_arg(T), N, Env),
- {Ts, N2} = label_list(map_es(T), N1, Env),
- {As, N3} = label_ann(T, N2),
- {ann_c_map(As, M, Ts), N3};
+ case is_c_map_pattern(T) of
+ false ->
+ {M, N1} = label(map_arg(T), N, Env),
+ {Ts, N2} = label_list(map_es(T), N1, Env),
+ {As, N3} = label_ann(T, N2),
+ {ann_c_map(As, M, Ts), N3};
+ true ->
+ {Ts, N1} = label_list(map_es(T), N, Env),
+ {As, N2} = label_ann(T, N1),
+ {ann_c_map_pattern(As, Ts), N2}
+ end;
map_pair ->
{Op, N1} = label(map_pair_op(T), N, Env),
{Key, N2} = label(map_pair_key(T), N1, Env),