def parse(cls, rules):
        if isinstance(rules, cls):
            return rules
        return cls(rules)
aggressive gc.collect for tests.
dataset/ETHPy150Open mbr/Babel-CLDR/babel/plural.py/PluralRule.parse--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/testing/util.py/jython_gc_collect