Turn --disallow-any-generics on when checking stubs with mypy

[ilevkivskyi]

I have noticed several people recently forgot to specify type arguments. Should we try enforcing this?

[gvanrossum]

+1, assuming we don't have to fix 100s of places...

[srittau]

More strictness is a good thing for typeshed, in my opinion.

[ilevkivskyi]

I actually just tried this and it causes around 400 errors. On one hand this is not too many to do this in general, on other hand it is probably too many to do this right now.

[gvanrossum]

Could we incrementally fix those errors? Even if some more of the same type of errors appear it would be less work to fix the final batch. Possibly we could add `# mypy: disallow-any-generics` to files that have been fixed (or create a mypy.ini file with sections for subdirectories we've fixed).

[ilevkivskyi]

Could we incrementally fix those errors? Even if some more of the same type of errors appear it would be less work to fix the final batch.

This is a good idea. @srittau what do you think about splitting the work, will you have time/energy? Also maybe @JelleZijlstra ?

[srittau]

Good idea indeed. I'll look into it tomorrow.