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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
..
annotations [ty] Do not bind self to non-positional parameters (#20850) 2025-10-13 20:44:27 +02:00
assignment [ty] bidirectional type inference using function return type annotations (#20528) 2025-10-11 00:38:35 +00:00
binary Update default and latest Python versions for 3.14 (#20725) 2025-10-07 12:23:11 -04:00
boolean Revert "[ty] Better control flow for boolean expressions that are inside if (#18010)" (#18150) 2025-05-17 08:27:32 -04:00
boundness_declaredness [ty] Reformulation of public symbol inference test suite (#20667) 2025-10-01 14:26:17 +02:00
call [ty] Treat `Callable` dunder members as bound method descriptors (#20860) 2025-10-14 14:27:52 +02:00
class [ty] Fix false-positive diagnostics on `super()` calls (#20814) 2025-10-13 10:57:46 +00:00
comparison [ty] detect cycles in binary comparison inference (#20446) 2025-09-17 09:45:25 +02:00
comprehensions [ty] Async for loops and async iterables (#19634) 2025-07-30 17:40:24 +02:00
conditional [ty] Support as-patterns in reachability analysis (#19728) 2025-08-04 20:13:50 +02:00
dataclasses [ty] Treat functions, methods, and dynamic types as function-like `Callable`s (#20842) 2025-10-13 15:21:55 +02:00
declaration [ty] Format conflicting types as an enumeration (#18956) 2025-06-26 14:29:33 +02:00
diagnostics [ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598) 2025-10-09 21:08:37 +00:00
directives [ty] Use annotated parameters as type context (#20635) 2025-10-03 17:14:51 -04:00
doc ty_python_semantic: add union type context to function call type errors 2025-05-09 13:40:51 -04:00
exception [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
expression [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
function [ty] Improve disambiguation of types via fully qualified names (#20141) 2025-08-29 08:44:18 +00:00
generics [ty] Diagnostic for generic classes that reference typevars in enclosing scope (#20822) 2025-10-13 19:30:49 -04:00
ide_support [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
import [ty] No union with `Unknown` for module-global symbols (#20664) 2025-10-01 16:40:30 +02:00
literal [ty] Treat functions, methods, and dynamic types as function-like `Callable`s (#20842) 2025-10-13 15:21:55 +02:00
loops [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
narrow [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
regression Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
scopes Update default and latest Python versions for 3.14 (#20725) 2025-10-07 12:23:11 -04:00
shadowing Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
snapshots [ty] Diagnostic for generic classes that reference typevars in enclosing scope (#20822) 2025-10-13 19:30:49 -04:00
stubs Update default and latest Python versions for 3.14 (#20725) 2025-10-07 12:23:11 -04:00
subscript [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
suppressions [ty] Consistent use of American english (in rules) (#19488) 2025-07-22 16:10:38 +02:00
type_compendium [ty] Type-context aware literal promotion (#20776) 2025-10-09 16:53:53 -04:00
type_of [ty] Improve the `Display` for generic `type[]` types (#19667) 2025-07-31 19:45:01 +01:00
type_properties [ty] Treat `Callable` dunder members as bound method descriptors (#20860) 2025-10-14 14:27:52 +02:00
type_qualifiers [ty] Allow annotation expressions to be `ast::Attribute` nodes (#20413) 2025-09-15 12:06:48 +01:00
unary Update class literal display to use `<class 'Foo'>` style (#17889) 2025-05-06 20:11:25 -04:00
with [ty] Use `typing.Self` for the first parameter of instance methods (#20517) 2025-09-29 21:08:08 +02:00
.mdformat.toml Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
async.md [ty] Support `async`/`await`, `async with` and `yield from` (#19595) 2025-07-30 11:51:21 +02:00
attributes.md [ty] Prefer declared base class attribute over inferred attribute on subclass (#20764) 2025-10-13 09:28:57 +02:00
bidirectional.md [ty] bidirectional type inference using function return type annotations (#20528) 2025-10-11 00:38:35 +00:00
classes.md [ty] don't assume that deferred type inference means deferred name resolution (#20160) 2025-08-29 16:19:45 -07:00
cycle.md [ty] Add cycle handling for unpacking targets (#18078) 2025-05-13 21:27:48 +00:00
decorators.md ty_python_semantic: add union type context to function call type errors 2025-05-09 13:40:51 -04:00
del.md [ty] No union with `Unknown` for module-global symbols (#20664) 2025-10-01 16:40:30 +02:00
deprecated.md [ty] Consistent use of American english (in rules) (#19488) 2025-07-22 16:10:38 +02:00
descriptor_protocol.md [ty] Use `typing.Self` for the first parameter of instance methods (#20517) 2025-09-29 21:08:08 +02:00
enums.md [ty] Enums: allow multiple aliases to point to the same member (#20669) 2025-10-01 15:51:53 +02:00
exhaustiveness_checking.md [ty] Fix subtyping for dynamic specializations (#20592) 2025-09-26 15:05:03 +02:00
final.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
implicit_type_aliases.md [ty] no more diverging query cycles in type expressions (#20359) 2025-09-16 16:44:11 -07:00
instance_layout_conflict.md [ty] initial support for `slots=True` in dataclasses (#20278) 2025-09-07 18:25:35 +01:00
intersection_types.md [ty] Expansion of enums into unions of literals (#19382) 2025-07-21 19:37:55 +02:00
invalid_syntax.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
known_constants.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
mdtest_config.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
mdtest_custom_typeshed.md [ty] Remove `Type::Tuple` (#19669) 2025-08-11 22:03:32 +01:00
metaclass.md Update class literal display to use `<class 'Foo'>` style (#17889) 2025-05-06 20:11:25 -04:00
mro.md [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
named_tuple.md [ty] Use `typing.Self` for the first parameter of instance methods (#20517) 2025-09-29 21:08:08 +02:00
overloads.md [ty] Improve diagnostics for bad `@overload` definitions (#20745) 2025-10-07 21:52:57 +00:00
pep695_type_aliases.md [ty] defer inference of legacy TypeVar bound/constraints/defaults (#20598) 2025-10-09 21:08:37 +00:00
properties.md [ty] `"foo".startswith` is not an instance of `types.MethodWrapperType` (#20317) 2025-09-10 11:14:26 +00:00
protocols.md [ty] Filter out `revealed-type` and `undefined-reveal` diagnostics from mdtest snapshots (#20820) 2025-10-12 18:39:32 +00:00
public_types.md [ty] Disambiguate classes that live in different modules but have the same fully qualified names (#20756) 2025-10-08 18:27:40 +01:00
statically_known_branches.md [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00
sys_platform.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
sys_version_info.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00
t_strings.md [ty] Add support for PEP 750 t-strings (#20085) 2025-08-25 18:49:49 +00:00
terminal_statements.md [ty] improve lazy scope place lookup (#19321) 2025-07-25 07:11:11 +00:00
ty_extensions.md [ty] Simplify and fix `CallableTypeOf[..]` implementation (#20797) 2025-10-10 12:04:37 +02:00
typed_dict.md [ty] bidirectional type inference using function return type annotations (#20528) 2025-10-11 00:38:35 +00:00
union_types.md [ty] Introduce `TypeRelation::Redundancy` (#20602) 2025-10-03 18:35:30 +01:00
unpacking.md [ty] Infer more precise types for collection literals (#20360) 2025-09-17 18:51:50 -04:00
unreachable.md [ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492) 2025-09-23 14:26:55 +00:00