Patch coming.
Created attachment 25910 [details] patch
FYI, I have another layout test to land with this change, but I left it back at the office.
r=me
Committed revision 39162.
Comment on attachment 25910 [details] patch I don't think there's enough coverage for your new parsing of \c \N \u \x and \B in the tests here. You should write some new tests. r=me