From d1088583ba41ece98455b95817888919183481db Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Tue, 4 Nov 2014 12:57:06 +1100
Subject: [PATCH] default generateUid scope to Program

---
 lib/6to5/file.js | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/lib/6to5/file.js b/lib/6to5/file.js
index 0c93ed0740..a53f7ab60e 100644
--- a/lib/6to5/file.js
+++ b/lib/6to5/file.js
@@ -4,6 +4,7 @@ var SHEBANG_REGEX = /^\#\!.*/;
 
 var transform = require("./transform");
 var generate  = require("./generator");
+var Scope     = require("./scope");
 var acorn     = require("acorn-6to5");
 var util      = require("./util");
 var t         = require("./types");
@@ -108,6 +109,7 @@ File.prototype.parse = function (code) {
 
 File.prototype.transform = function (ast) {
   this.ast = ast;
+  this.scope = new Scope(null, ast.program);
 
   var self = this;
 
@@ -135,15 +137,12 @@ File.prototype.generate = function () {
 };
 
 File.prototype.generateUid = function (name, scope) {
-  if (scope) {
-    var uid;
-    do {
-      uid = this._generateUid(name);
-    } while (scope.has(uid));
-    return uid;
-  } else {
-    return this._generateUid(name);
-  }
+  scope = scope || this.scope;
+  var uid;
+  do {
+    uid = this._generateUid(name);
+  } while (scope.has(uid));
+  return uid;
 };
 
 File.prototype._generateUid = function (name) {