Mark Shannon <m...@hotpy.org> added the comment:

I can reproduce this on linux.

The problem is that when closing a generator that has not started, the frame 
may not be in a valid state (hence the assertion failure).

This should be fixed by implementing 
https://github.com/faster-cpython/ideas/discussions/217 as that will ensure 
that the frame is in a valid state before the generator is created.

I'll make implementing https://github.com/faster-cpython/ideas/discussions/217 
a priority in order to fix this.

----------
assignee:  -> Mark.Shannon
nosy: +brandtbucher

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<https://bugs.python.org/issue46374>
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