[red-knot] Add tests asserting that subclasses of Any are assignable to arbitrary protocol types
#17810
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…e to arbitrary protocol types
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Summary
I thought we might have to add some new branches to
Type::is_assignable_tohere, similar to what we did forCallabletypes in #17717. But it turns out that it just falls out naturally from the logic we already have in place. A subclass ofAnyjust returns a synthesized attribute of typeAnyfor any member access where the member is not explicitly annotated on the subclass. And protocol subtyping/assignability works entirely through member access APIs onType.Test Plan
this PR is only tests