Resolves #8627

[i64]

No description provided.

[msullivan]

This looks good but I think it doesn't solve the whole issue. This deals with it for types but also I think needs to deal with it for expressions in Python 3.

[i64]

Sorry, I don't understand what you mean with "expressions in Python 3"

[davidzwa]

Just a thought, I think he means Python 3.5, 3.6 etc (not only 3.9 and up), but I might be wrong as he mentions expressions (vs types).

[hauntsaninja]

Hello!

I wrote up my own version of this fix, before I found that this PR existed. I believe Sully's referring to making sure anywhere else we visit_Subscript we do the right thing, which I think happens to work out (modulo some additional line and column setting).

You'll still want CI to pass though, feel free to look at my fix. Also happy to open a PR directly: https://github.com/hauntsaninja/mypy/tree/py39
Analogous commit on that branch: hauntsaninja@9c985ba

Separately, some stuff still needs to happen to get CI green for Python 3.9, see https://bugs.python.org/issue40349. We should probably start tracking stuff come beta.

[hauntsaninja]

This should be closed, since we merged #8716

[JelleZijlstra]

Thanks for your contribution @CyberSaxosTiGER.