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The addition of a simple decorator to the 'ArgumentParser' class, would simplify registering the tests:
 def crosstest(self, func):
 # decorator to facilitate adding these functions
 name = func.__name__
 self.register('cross_tests', name, func)
which would be used as:
 @parser.crosstest
 def pat_or_suf(parser, seen_actions, *args):
 if 2==len(seen_actions.intersection([a_pat, a_suf])):
 parser.error('only one of PATTERN and SUFFIX allowed')