fix corner cases with new.target (#4784)

lib/ast.js

@@ -55,9 +55,10 @@ function DEFNODE(type, props, methods, base) {
     props.forEach(function(prop) {
         code.push("this.", prop, "=props.", prop, ";");
     });
+    code.push("}");
     var proto = base && new base;
     if (proto && proto.initialize || methods && methods.initialize) code.push("this.initialize();");
-    code.push("}}");
+    code.push("}");
     var ctor = new Function(code.join(""))();
     if (proto) {
         ctor.prototype = proto;
@@ -1818,6 +1819,9 @@ var AST_This = DEFNODE("This", null, {
 
 var AST_NewTarget = DEFNODE("NewTarget", null, {
     $documentation: "The `new.target` symbol",
+    initialize: function() {
+        this.name = "new.target";
+    },
     _validate: function() {
         if (this.name !== "new.target") throw new Error('name must be "new.target": ' + this.name);
     },