I'm trying to emulate the Python 2.5 behaviour (PEP 342) of generator functions where the `yield` statement is in a `try/finally` block. Basically, where the `finally` block is guaranteed to run even if the generator doesn't finish running: it simply runs when the generator is garbage-collected. Does anyone know a good way of doing this? I'm looking to see if there's a way to bring about an exception in another frame in pure Python, but I haven't found anything yet.
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