From 3e0b9b6b4eee4ef38e15dae39aed37c7a642cff8 Mon Sep 17 00:00:00 2001
From: Jhen <developer@jhen.me>
Date: Sun, 20 Sep 2015 04:01:10 +0800
Subject: [PATCH] [es6.tailCall] Move '<arg> = undefined' to the place in front
 of Continue statement

---
 .../transformers/es6/tail-call.js             | 27 +++++++++----------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/packages/babel/src/transformation/transformers/es6/tail-call.js b/packages/babel/src/transformation/transformers/es6/tail-call.js
index 7a4ae6c37d..350de4c0c6 100644
--- a/packages/babel/src/transformation/transformers/es6/tail-call.js
+++ b/packages/babel/src/transformation/transformers/es6/tail-call.js
@@ -240,20 +240,6 @@ class TailCallTransformer {
       bodyNode._blockHoist = 2;
     }
 
-    if (this.vars.length > 0) {
-      var declarations = flatten(map(this.vars, function (decl) {
-        return decl.declarations;
-      }));
-
-      var assignment = reduceRight(declarations, function (expr, decl) {
-        return t.assignmentExpression("=", decl.id, expr);
-      }, t.identifier("undefined"));
-
-      var statement = t.expressionStatement(assignment);
-      statement._blockHoist = Infinity;
-      body.unshift(statement);
-    }
-
     var paramDecls = this.paramDecls;
     if (paramDecls.length > 0) {
       var paramDecl = t.variableDeclaration("var", paramDecls);
@@ -492,6 +478,19 @@ class TailCallTransformer {
       t.assignmentExpression("=", this.getAgainId(), t.literal(true))
     ));
 
+    if (this.vars.length > 0) {
+      var declarations = flatten(map(this.vars, function (decl) {
+        return decl.declarations;
+      }));
+
+      var assignment = reduceRight(declarations, function (expr, decl) {
+        return t.assignmentExpression("=", decl.id, expr);
+      }, t.identifier("undefined"));
+
+      var statement = t.expressionStatement(assignment);
+      body.push(statement);
+    }
+
     body.push(t.continueStatement(this.getFunctionId()));
 
     return body;