1 files changed, 16 insertions, 0 deletions
diff --git a/lib/compiler/src/sys_pre_expand.erl b/lib/compiler/src/sys_pre_expand.erl
index 48d9c16718..969e95e8dc 100644
--- a/lib/compiler/src/sys_pre_expand.erl
+++ b/lib/compiler/src/sys_pre_expand.erl
@@ -228,6 +228,12 @@ pattern({cons,Line,H,T}, St0) ->
 pattern({tuple,Line,Ps}, St0) ->
     {TPs,St1} = pattern_list(Ps, St0),
     {{tuple,Line,TPs},St1};
+pattern({map,Line,Ps}, St0) ->
+    {TPs,St1} = pattern_list(Ps, St0),
+    {{map,Line,TPs},St1};
+pattern({map_field,Line,Key,V0}, St0) ->
+    {V,St1} = pattern(V0, St0),
+    {{map_field,Line,Key,V},St1};
 %%pattern({struct,Line,Tag,Ps}, St0) ->
 %%    {TPs,TPsvs,St1} = pattern_list(Ps, St0),
 %%    {{tuple,Line,[{atom,Line,Tag}|TPs]},TPsvs,St1};
@@ -321,6 +327,16 @@ expr({tuple,Line,Es0}, St0) ->
 %%expr({struct,Line,Tag,Es0}, Vs, St0) ->
 %%    {Es1,Esvs,Esus,St1} = expr_list(Es0, Vs, St0),
 %%    {{tuple,Line,[{atom,Line,Tag}|Es1]},Esvs,Esus,St1};
+expr({map,Line,Es0}, St0) ->
+    {Es1,St1} = expr_list(Es0, St0),
+    {{map,Line,Es1},St1};
+expr({map,Line,Var,Es0}, St0) ->
+    {Es1,St1} = expr_list(Es0, St0),
+    {{map,Line,Var,Es1},St1};
+expr({map_field,Line,K0,V0}, St0) ->
+    {K,St1} = expr(K0, St0),
+    {V,St2} = expr(V0, St1),
+    {{map_field,Line,K,V},St2};
 expr({bin,Line,Es0}, St0) ->
     {Es1,St1} = expr_bin(Es0, St0),
     {{bin,Line,Es1},St1};