match: let regex match function return a boolean Match function for regex pattern kind is built through _buildregexmatch() and _buildmatch() using _rematcher() that returns a re.match function, which either returns a match object or None. This does not conform to Mercurial's matcher interface for __call__() or exact(), which are expected to return a boolean value. We fix this by building a lambda around _rematcher() in _buildregexmatch(). Accordingly, we update doctest examples to remove bool() calls that are now useless.