Mangling externally imported names by using aliasing

lib/ast.js

@@ -707,6 +707,12 @@ var AST_NameImport = DEFNODE("NameImport", "foreign_name name", {
     $propdoc: {
         foreign_name: "[AST_SymbolImportForeign] The name being imported (as specified in the module)",
         name: "[AST_SymbolImport] The name as it becomes available to this module."
+    },
+    _walk: function (visitor) {
+        return visitor._visit(this, function() {
+            this.foreign_name._walk(visitor);
+            this.name._walk(visitor);
+        });
     }
 })
 
@@ -722,6 +728,11 @@ var AST_Import = DEFNODE("Import", "imported_name imported_names module_name", {
             if (this.imported_name) {
                 this.imported_name._walk(visitor);
             }
+            if (this.imported_names) {
+                this.imported_names.forEach(function (name_import) {
+                    name_import._walk(visitor);
+                });
+            }
             this.module_name._walk(visitor);
         });
     }