XS functions to assist in parsing sub-like syntax

 XS::Parse::Sublike provides some XS functions to assist in writing parsers
 for sub-like syntax, primarily for authors of keyword plugins using the
 PL_keyword_plugin hook mechanism. It is unlikely to be of much use to anyone
 else; and highly unlikely to be any use when writing perl code using these.
 Unless you are writing a keyword plugin using XS, this module is not for you.