Are there any real examples of people writing ["a", "b", "c"][1] or the like where this optimization would help things?

I don't know, actually. Someone in the Python Discord suggested to open an issue with this one, since the implementation is just simple.

Apart from the doubts already expressed about the usefulness of this optimisation, a PR like this needs to include a unit test that asserts that the optimisation did what it was supposed to do. Otherwise we can break the optimisation without even knowing with future code changes.

Uh oh!

Optimizing constant list subscripting #96939

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