Change the alias from id() to con()

src/aeso_parser.erl

@@ -137,12 +137,12 @@ fundef_or_decl() ->
             fundef()]).
 
 using() ->
-    ?RULE(keyword(using), con(), optional({keyword(as), id()}), using(get_ann(_1), _2, _3)).
+    ?RULE(keyword(using), con(), optional({keyword(as), con()}), using(get_ann(_1), _2, _3)).
 
 using(Ann, Con, none) ->
     {using, Ann, Con};
-using(Ann, Con, {ok, {_, Id}}) ->
-    {using, Ann, Con, Id}.
+using(Ann, Con, {ok, {_, Alias}}) ->
+    {using, Ann, Con, Alias}.
 
 pragma() ->
     Op = choice([token(T) || T <- ['<', '=<', '==', '>=', '>']]),

src/aeso_syntax.erl

@@ -54,7 +54,7 @@
 -type pragma() :: {compiler, '==' | '<' | '>' | '=<' | '>=', compiler_version()}.
 
 -type using() :: {using, ann(), con()}
-               | {using, ann(), con(), id()}.
+               | {using, ann(), con(), con()}.
 
 -type letval()  :: {letval, ann(), pat(), expr()}.
 -type letfun()  :: {letfun, ann(), id(), [pat()], type(), expr()}.