@property
    def sequences_optional(self):

        return exclusions.only_if([
            lambda config: config.db.dialect.supports_sequences and
            config.db.dialect.sequences_optional
        ], "no sequence support, or sequences not optional")
L{_ThreePhaseEvent.removeTrigger} should accept an opaque object
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/testing/requirements.py/SuiteRequirements.sequences_optional--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_internet.py/ThreePhaseEventTests.test_removeTrigger