From 6898cf83d09f0e8fde8dbcc1b5a96301970d5638 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Tue, 15 Sep 2015 06:27:37 +0100
Subject: [PATCH] don't allow visitor methods to return a new node to replace

---
 packages/babel-traverse/src/path/context.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/babel-traverse/src/path/context.js b/packages/babel-traverse/src/path/context.js
index df2b48bd66..1a01ccb748 100644
--- a/packages/babel-traverse/src/path/context.js
+++ b/packages/babel-traverse/src/path/context.js
@@ -23,7 +23,7 @@ export function call(key) {
       var replacement = fn.call(this, this, this.state);
 
       if (replacement) {
-        this.replaceWith(replacement, true);
+        throw new Error("Unexpected return value from visitor method");
       }
 
       if (this.shouldStop || this.shouldSkip || this.removed) return;