Allow "multi-bracket" regexes
Allow "multi-bracket" regexes

This isn't an offical Perl 6 term; this is a term I use to denote
a common bug I've found in my lexer.  It involves things that look
like this:

    m?< some stuff?

This used to parse incorrectly.

aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments,aswinpj/Pygments