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[red-knot] handle synthetic 'self' argument in call-binding diagnostics (#15362)

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Carl Meyer 2025-01-09 00:36:48 -08:00 • committed by GitHub
parent 21aa12a073
commit a95deec00f
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3 changed files with 65 additions and 15 deletions
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crates/red_knot_python_semantic/resources/mdtest/call/callable_instance.md
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@ -70,3 +70,32 @@ def _(flag: bool):
# error: "Object of type `Literal[1] | Literal[__call__]` is not callable (due to union element `Literal[1]`)"
reveal_type(a()) # revealed: Unknown | int
```
## Call binding errors
### Wrong argument type
```py
class C:
def __call__(self, x: int) -> int:
return 1
c = C()
# error: 15 [invalid-argument-type] "Object of type `Literal["foo"]` cannot be assigned to parameter 2 (`x`) of function `__call__`; expected type `int`"
reveal_type(c("foo")) # revealed: int
```
### Wrong argument type on `self`
```py
class C:
# TODO this definition should also be an error; `C` must be assignable to type of `self`
def __call__(self: int) -> int:
return 1
c = C()
# error: 13 [invalid-argument-type] "Object of type `C` cannot be assigned to parameter 1 (`self`) of function `__call__`; expected type `int`"
reveal_type(c()) # revealed: int
```