From ba9b85f64b373536577d0a9686341218e16dd8ce Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Fri, 13 Feb 2015 20:36:43 +1100
Subject: [PATCH] only use functions returnType if it hasn't been reassigned

---
 lib/6to5/traversal/scope.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/6to5/traversal/scope.js b/lib/6to5/traversal/scope.js
index 43f2dc97d3..f2f9691554 100644
--- a/lib/6to5/traversal/scope.js
+++ b/lib/6to5/traversal/scope.js
@@ -224,7 +224,10 @@ Scope.prototype.inferType = function (node) {
 
   if (t.isCallExpression(target) && t.isIdentifier(target.callee)) {
     var funcInfo = this.getBindingInfo(target.callee.name);
-    if (funcInfo) return funcInfo.node.returnType;
+    if (funcInfo) {
+      var funcNode = funcInfo.node;
+      return !funcInfo.reassigned && t.isFunction(funcNode) && node.returnType;
+    }
   }
 
   if (t.isIdentifier(target)) {