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[red-knot] remove wrong typevar attribute implementations (#14540)

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This commit is contained in:
Carl Meyer
2024-11-22 13:17:16 -08:00
committed by GitHub
parent 13e9fc9362
commit 4ba847f250
3 changed files with 85 additions and 53 deletions
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40
crates/red_knot_python_semantic/resources/mdtest/generics.md
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@@ -60,52 +60,20 @@ reveal_type(S) # revealed: Literal[S]
## Type params
A PEP695 type variable defines a value of type `typing.TypeVar` with attributes `__name__`,
`__bounds__`, `__constraints__`, and `__default__` (the latter three all lazily evaluated):
A PEP695 type variable defines a value of type `typing.TypeVar`.
```py
def f[T, U: A, V: (A, B), W = A, X: A = A1]():
def f[T]():
reveal_type(T) # revealed: T
reveal_type(T.__name__) # revealed: Literal["T"]
reveal_type(T.__bound__) # revealed: None
reveal_type(T.__constraints__) # revealed: tuple[()]
reveal_type(T.__default__) # revealed: NoDefault
reveal_type(U) # revealed: U
reveal_type(U.__name__) # revealed: Literal["U"]
reveal_type(U.__bound__) # revealed: type[A]
reveal_type(U.__constraints__) # revealed: tuple[()]
reveal_type(U.__default__) # revealed: NoDefault
reveal_type(V) # revealed: V
reveal_type(V.__name__) # revealed: Literal["V"]
reveal_type(V.__bound__) # revealed: None
reveal_type(V.__constraints__) # revealed: tuple[type[A], type[B]]
reveal_type(V.__default__) # revealed: NoDefault
reveal_type(W) # revealed: W
reveal_type(W.__name__) # revealed: Literal["W"]
reveal_type(W.__bound__) # revealed: None
reveal_type(W.__constraints__) # revealed: tuple[()]
reveal_type(W.__default__) # revealed: type[A]
reveal_type(X) # revealed: X
reveal_type(X.__name__) # revealed: Literal["X"]
reveal_type(X.__bound__) # revealed: type[A]
reveal_type(X.__constraints__) # revealed: tuple[()]
reveal_type(X.__default__) # revealed: type[A1]
class A: ...
class B: ...
class A1(A): ...
```
## Minimum two constraints
A typevar with less than two constraints emits a diagnostic and is treated as unconstrained:
A typevar with less than two constraints emits a diagnostic:
```py
# error: [invalid-typevar-constraints] "TypeVar must have at least two constrained types"
def f[T: (int,)]():
reveal_type(T.__constraints__) # revealed: tuple[()]
pass
```