From 9d7e953451033cbcd40622becb61f54c280096da Mon Sep 17 00:00:00 2001
From: Ryunosuke SATO <tricknotes.rs@gmail.com>
Date: Tue, 10 Mar 2015 04:05:53 +0900
Subject: [PATCH] Ignore assignment to Error#stack if it is readonly property

`Error#stack` may be an readonly property in some environments
such as PhantomJS 1.9.2 and Safari 7.0.
---
 src/babel/helpers/parse.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/babel/helpers/parse.js b/src/babel/helpers/parse.js
index c8dc921ee7..255ad436eb 100644
--- a/src/babel/helpers/parse.js
+++ b/src/babel/helpers/parse.js
@@ -40,7 +40,13 @@ export default function (opts, code, callback) {
         message += frame;
       }
 
-      if (err.stack) err.stack = err.stack.replace(err.message, message);
+      if (err.stack) {
+        var newStack = err.stack.replace(err.message, message);
+        try {
+          err.stack = newStack;
+        } catch (e) { /* `err.stack` may be a readonly property in some environments. */ }
+      }
+
       err.message = message;
     }