Return undefined from RegExp.prototype.compile

src/js/regexp.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
@@ skipping 94 matching lines @@
                         "RegExp.prototype.compile", this);
   }
 
   if (IS_REGEXP(pattern)) {
     if (!IS_UNDEFINED(flags)) throw MakeTypeError(kRegExpFlags);
 
     flags = PatternFlags(pattern);
     pattern = REGEXP_SOURCE(pattern);
   }
 
-  return RegExpInitialize(this, pattern, flags);
+  RegExpInitialize(this, pattern, flags);
+
+  // Return undefined for compatibility with JSC.
+  // See http://crbug.com/585775 for web compat details.
 }
 
 
 function DoRegExpExec(regexp, string, index) {
   return %_RegExpExec(regexp, string, index, RegExpLastMatchInfo);
 }
 
 
 // This is kind of performance sensitive, so we want to avoid unnecessary
 // type checks on inputs. But we also don't want to inline it several times
@@ skipping 627 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })