Class Manager

Lib/test/test_coroutines.py:1206–1220

    def test_with_1(self):
        class Manager:
            def __init__(self, name):
                self.name = name

            async def __aenter__(self):
                await AsyncYieldFrom(['enter-1-' + self.name,
                                      'enter-2-' + self.name])
                return self

            async def __aexit__(self, *args):
                await AsyncYieldFrom(['exit-1-' + self.name,
                                      'exit-2-' + self.name])

                if self.name == 'B':
                    return True


        async def foo():