[red-knot] class bases are not affected by __future__.annotations #17456
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dcreager
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* main: [red-knot] class bases are not affected by __future__.annotations (#17456) [red-knot] Add support for overloaded functions (#17366) [`pyupgrade`] Add fix safety section to docs (`UP036`) (#17444) [red-knot] more type-narrowing in match statements (#17302) [red-knot] Add some narrowing for assignment expressions (#17448) [red-knot] Understand `typing.Protocol` and `typing_extensions.Protocol` as equivalent (#17446) Server: Use `min` instead of `max` to limit the number of threads (#17421)
dcreager
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* main: (123 commits) [red-knot] Handle explicit class specialization in type expressions (#17434) [red-knot] allow assignment expression in call compare narrowing (#17461) [red-knot] fix building unions with literals and AlwaysTruthy/AlwaysFalsy (#17451) [red-knot] Type narrowing for assertions (take 2) (#17345) [red-knot] class bases are not affected by __future__.annotations (#17456) [red-knot] Add support for overloaded functions (#17366) [`pyupgrade`] Add fix safety section to docs (`UP036`) (#17444) [red-knot] more type-narrowing in match statements (#17302) [red-knot] Add some narrowing for assignment expressions (#17448) [red-knot] Understand `typing.Protocol` and `typing_extensions.Protocol` as equivalent (#17446) Server: Use `min` instead of `max` to limit the number of threads (#17421) [red-knot] Detect version-related syntax errors (#16379) [`pyflakes`] Add fix safety section (`F841`) (#17410) [red-knot] Add `KnownFunction` variants for `is_protocol`, `get_protocol_members` and `runtime_checkable` (#17450) Bump 0.11.6 (#17449) Auto generate `visit_source_order` (#17180) [red-knot] Initial tests for protocols (#17436) [red-knot] Dataclasses: synthesize `__init__` with proper signature (#17428) [red-knot] Dataclasses: support `order=True` (#17406) [red-knot] Super-basic generic inference at call sites (#17301) ...
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Summary
We were over-conflating the conditions for deferred name resolution.
from __future__ import annotationsdefers annotations, but not class bases. In stub files, class bases are also deferred. Modeling this correctly also reduces likelihood of cycles in Python files usingfrom __future__ import annotations(since deferred resolution is inherently cycle-prone). The same cycles are still possible in.pyifiles, but much less likely, since typically there isn't anything in apyifile that would cause an early return from a scope, or otherwise cause visibility constraints to persist to end of scope. Usually there is only code at module global scope and class scope, which can't havereturnstatements, andraiseorassertstatements in a stub file would be very strange. (Technically according to the spec we'd be within our rights to just forbid a whole bunch of syntax outright in a stub file, but I kinda like minimizing unnecessary differences between the handling of Python files and stub files.)Test Plan
Added mdtests.