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[red-knot] Add support for @classmethods (#16305)

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## Summary

Add support for `@classmethod`s.

```py
class C:
    @classmethod
    def f(cls, x: int) -> str:
        return "a"

reveal_type(C.f(1))  # revealed: str
```

## Test Plan

New Markdown tests
This commit is contained in:
David Peter
2025-02-24 09:55:34 +01:00
committed by GitHub
parent 81a57656d8
commit 141ba253da
15 changed files with 272 additions and 60 deletions
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6
crates/red_knot_python_semantic/resources/mdtest/binary/instances.md
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@@ -306,7 +306,7 @@ reveal_type(1 + A()) # revealed: A
reveal_type(A() + "foo") # revealed: A
# TODO should be `A` since `str.__add__` doesn't support `A` instances
# TODO overloads
reveal_type("foo" + A()) # revealed: @Todo(return type)
reveal_type("foo" + A()) # revealed: @Todo(return type of decorated function)
reveal_type(A() + b"foo") # revealed: A
# TODO should be `A` since `bytes.__add__` doesn't support `A` instances
@@ -314,7 +314,7 @@ reveal_type(b"foo" + A()) # revealed: bytes
reveal_type(A() + ()) # revealed: A
# TODO this should be `A`, since `tuple.__add__` doesn't support `A` instances
reveal_type(() + A()) # revealed: @Todo(return type)
reveal_type(() + A()) # revealed: @Todo(return type of decorated function)
literal_string_instance = "foo" * 1_000_000_000
# the test is not testing what it's meant to be testing if this isn't a `LiteralString`:
@@ -323,7 +323,7 @@ reveal_type(literal_string_instance) # revealed: LiteralString
reveal_type(A() + literal_string_instance) # revealed: A
# TODO should be `A` since `str.__add__` doesn't support `A` instances
# TODO overloads
reveal_type(literal_string_instance + A()) # revealed: @Todo(return type)
reveal_type(literal_string_instance + A()) # revealed: @Todo(return type of decorated function)
```
## Operations involving instances of classes inheriting from `Any`