[issue42899] Is it legal to eliminate tests of a value, when that test has no effect on control flow?

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

If an optimization changes semantics it's not an optimization.

In  `if x: pass` how do we know `x` is falsely without calling `bool()` on it?

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On a slightly different note, in the code:

    if a and b:
       ...

why is `bool(a)` called twice?

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nosy: +ethan.furman

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<https://bugs.python.org/issue42899>
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