rakudo/rakudo — pull request #91 by FROGGS (2012-11-26 14:03:46+00:00)
Title: typed exceptions: X::Backslash::UnrecognizedSequence, [...]::NonVariableDollar

rakudo: "\u" was:
Method 'sorry' not found for invocant of class 'Perl6::QGrammar+{qq}+{stop}'

is now as its own type:
Unrecognized backslash sequence: '\u'

There is a x_baskslash NQP branch related to that, should be merged too.
The spectest still passes of course, and I'll add a test for "\u" when this pull request is merged.