From 3078d481789f19f90779149726d9504126952f07 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sun, 26 Apr 2015 21:15:30 +0100
Subject: [PATCH] don't rely on sequence expressions for <= 1 sequence
 expressions in blockScoping transformer

---
 src/babel/transformation/transformers/es6/block-scoping.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/babel/transformation/transformers/es6/block-scoping.js b/src/babel/transformation/transformers/es6/block-scoping.js
index 391c7dccaa..4c2bea586a 100644
--- a/src/babel/transformation/transformers/es6/block-scoping.js
+++ b/src/babel/transformation/transformers/es6/block-scoping.js
@@ -139,7 +139,12 @@ var hoistVarDeclarationsVisitor = {
   enter(node, parent, scope, self) {
     if (this.isForStatement()) {
       if (isVar(node.init, node)) {
-        node.init = t.sequenceExpression(self.pushDeclar(node.init));
+        var nodes = self.pushDeclar(node.init);
+        if (nodes.length === 1) {
+          node.init = nodes[0];
+        } else {
+          node.init = t.sequenceExpression(nodes);
+        }
       }
     } else if (this.isFor()) {
       if (isVar(node.left, node)) {