[issue32856] Optimize the `for y in [x]` idiom in comprehensions

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> I just discovered that the assignment operator leaks variables
> out of comprehensions.
> ...
> So it does not supersedes this optimization.

That's a real bummer.  IIRC, it was discussion of this proposal that motivated the creation of the walrus operator.

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nosy: +rhettinger

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<https://bugs.python.org/issue32856>
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