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-rw-r--r--lib/compiler/src/sys_pre_expand.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/compiler/src/sys_pre_expand.erl b/lib/compiler/src/sys_pre_expand.erl
index 91a46a20fe..761ae8409c 100644
--- a/lib/compiler/src/sys_pre_expand.erl
+++ b/lib/compiler/src/sys_pre_expand.erl
@@ -232,7 +232,7 @@ pattern({map,Line,Ps}, St0) ->
{TPs,St1} = pattern_list(Ps, St0),
{{map,Line,TPs},St1};
pattern({map_field_exact,Line,K0,V0}, St0) ->
- {K,St1} = pattern(K0, St0),
+ {K,St1} = expr(K0, St0),
{V,St2} = pattern(V0, St1),
{{map_field_exact,Line,K,V},St2};
%%pattern({struct,Line,Tag,Ps}, St0) ->