| Checks for generators that use contextmanagers that don't handle cleanup properly. | |
| Is meant to raise visibilty on the case that a generator is not fully exhausted and the contextmanager is not cleaned up properly. | |
| A contextmanager must yield a non-constant value and not handle cleanup for GeneratorExit. | |
| The using generator must attempt to use the yielded context value `with x() as y` and not just `with x()`. | |
| Closes #2832 |