From: Forbes Lindesay <forbes@lindesay.co.uk>
Date: Mon, 22 Jul 2013 00:44:03 +0000 (+0100)
Subject: Make `DefaultsError` a real `Error` object
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=dfa395f6ff405bbea018dbc24b31cbd49a9ac6ef;p=UglifyJS.git

Make `DefaultsError` a real `Error` object
---

diff --git a/lib/utils.js b/lib/utils.js
index 73964a09..20f9a8e1 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -82,9 +82,12 @@ function repeat_string(str, i) {
 };
 
 function DefaultsError(msg, defs) {
+    Error.call(this, msg)
     this.msg = msg;
     this.defs = defs;
 };
+DefaultsError.prototype = Object.create(Error.prototype)
+DefaultsError.prototype.constructor = DefaultsError
 
 function defaults(args, defs, croak) {
     if (args === true)