From 836bc3a9a452f38cc6c0b3a55cd044fe8145a0fc Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Wed, 28 Jan 2015 14:47:09 +1100
Subject: [PATCH] only check for duplicates for let variables

---
 lib/6to5/traverse/scope.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/6to5/traverse/scope.js b/lib/6to5/traverse/scope.js
index 9b6f1fc8d0..8718955d30 100644
--- a/lib/6to5/traverse/scope.js
+++ b/lib/6to5/traverse/scope.js
@@ -169,7 +169,7 @@ var programReferenceVisitor = {
 var blockVariableVisitor = {
   enter: function (node, parent, scope, context, add) {
     if (t.isBlockScoped(node)) {
-      add(node, false, true);
+      add(node, false, t.isLet(node));
     } else if (t.isScope(node)) {
       context.stop();
     }