ruff/crates/ty_python_semantic/resources/mdtest/call
David Peter 6341bb7403
[ty] Treat `Callable` dunder members as bound method descriptors (#20860)
## Summary

Dunder methods (at least the ones defined in the standard library)
always take an instance of the class as the first parameter. So it seems
reasonable to generally treat them as bound method descriptors if they
are defined via a `Callable` type.

This removes just a few false positives from the ecosystem, but solves
three user-reported issues:

closes https://github.com/astral-sh/ty/issues/908
closes https://github.com/astral-sh/ty/issues/1143
closes https://github.com/astral-sh/ty/issues/1209

In addition to the change here, I also considered [making `ClassVar`s
bound method descriptors](https://github.com/astral-sh/ruff/pull/20861).
However, there was zero ecosystem impact. So I think we can also close
https://github.com/astral-sh/ty/issues/491 with this PR.

closes https://github.com/astral-sh/ty/issues/491

## Test Plan

Added regression test
2025-10-14 14:27:52 +02:00
..
annotation.md ty_python_semantic: add union type context to function call type errors 2025-05-09 13:40:51 -04:00
builtins.md [ty] More precise type inference for dictionary literals (#20523) 2025-09-24 18:12:00 -04:00
callable_instance.md [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
callables_as_descriptors.md [ty] Treat `Callable` dunder members as bound method descriptors (#20860) 2025-10-14 14:27:52 +02:00
constructor.md [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
dunder.md [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
dunder_import.md [ty] Add special-cased inference for `__import__(name)` and `importlib.import_module(name)` (#19008) 2025-06-29 11:49:23 +01:00
function.md [ty] Filter overloads using variadic parameters (#20547) 2025-09-25 14:58:00 +00:00
getattr_static.md Update default and latest Python versions for 3.14 (#20725) 2025-10-07 12:23:11 -04:00
invalid_syntax.md ty_python_semantic: add union type context to function call type errors 2025-05-09 13:40:51 -04:00
methods.md [ty] Simplify and fix `CallableTypeOf[..]` implementation (#20797) 2025-10-10 12:04:37 +02:00
never.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
open.md [ty] Todo-types for `os.fdopen`, `NamedTemporaryFile`, and `Path.open` (#20549) 2025-09-24 15:43:58 +02:00
overloads.md [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
replace.md [ty] Sync vendored typeshed stubs (#20658) 2025-10-01 10:11:48 +02:00
str_startswith.md [ty] `"foo".startswith` is not an instance of `types.MethodWrapperType` (#20317) 2025-09-10 11:14:26 +00:00
subclass_of.md [ty] Include synthesized arguments in displayed counts for `too-many-positional-arguments` (#18098) 2025-05-14 22:51:23 -04:00
union.md [ty] Use annotated parameters as type context (#20635) 2025-10-03 17:14:51 -04:00