upgrading the test harness

lib/coffee_script/scope.js

@@ -9,15 +9,13 @@
   // as well as the Expressions body where it should declare its variables,
   // and the function that it wraps.
   Scope = (exports.Scope = function Scope(parent, expressions, method) {
-    var __a;
     this.parent = parent;
     this.expressions = expressions;
     this.method = method;
     this.variables = {
     };
     this.temp_variable = this.parent ? this.parent.temp_variable : '__a';
-    __a = this;
-    return Scope === this.constructor ? this : __a;
+    return this;
   });
   // Look up a variable in lexical scope, or declare it if not found.
   Scope.prototype.find = function find(name, remote) {