From 11aad46078707daf8ed64d12c5441406b144d478 Mon Sep 17 00:00:00 2001
From: Rob Colburn <rob@robcolburn.com>
Date: Tue, 24 Jun 2014 12:53:07 -0700
Subject: [PATCH] Throw descriptive error for Invalid RegExp

Throws up descriptive error when parsing an invalid regular expression
"test".match(/test/i || /test2/i);
---
 lib/output.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/output.js b/lib/output.js
index b9637929..f4ec36b1 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -1153,7 +1153,12 @@ function OutputStream(options) {
     };
 
     DEFPRINT(AST_RegExp, function(self, output){
-        var str = self.getValue().toString();
+        var str = self.getValue()
+        try {
+            str = str.toString();
+        } catch (e) {
+            throw new Error('Cannot evaluate RegExp [' + self.start.file + ':' + self.start.line + ',' + self.start.col + ']');
+        }
         if (output.option("ascii_only")) {
             str = output.to_ascii(str);
         } else if (output.option("unescape_regexps")) {