add AST_SymbolConst for names defined with const

lib/parse.js

@@ -1105,12 +1105,12 @@ function parse($TEXT, options) {
         });
     };
 
-    function vardefs(no_in) {
+    function vardefs(no_in, in_const) {
         var a = [];
         for (;;) {
             a.push(new AST_VarDef({
                 start : S.token,
-                name  : as_symbol(AST_SymbolVar),
+                name  : as_symbol(in_const ? AST_SymbolConst : AST_SymbolVar),
                 value : is("operator", "=") ? (next(), expression(false, no_in)) : null,
                 end   : prev()
             }));
@@ -1124,7 +1124,7 @@ function parse($TEXT, options) {
     var var_ = function(no_in) {
         return new AST_Var({
             start       : prev(),
-            definitions : vardefs(no_in),
+            definitions : vardefs(no_in, false),
             end         : prev()
         });
     };
@@ -1132,7 +1132,7 @@ function parse($TEXT, options) {
     var const_ = function() {
         return new AST_Const({
             start       : prev(),
-            definitions : vardefs(),
+            definitions : vardefs(false, true),
             end         : prev()
         });
     };