Steps to reproduce (using a debug build): 1. Open <https://www.hsbccreditcard.com> (no need to log in) 2. Open Web Inspector (Cmd+Option+C) 3. Reload The issue is that the Parser's JSTokenLocation is not fully initialized during construction. Once this is fixed, the above assertion no longer manifests. ref: <rdar://problem/14633089>
Created attachment 208229 [details] the patch
Thanks for the review. Landed in r153774: <http://trac.webkit.org/r153774>.