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

> How do we know `x` is falsey without calling `bool()` on it?

We don't, but in `if x: pass`, it doesn't matter.
Discounting side-effects in __bool__, the code does nothing regardless of the 
value of `x`.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42899>
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