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[ty] Proper assignability/subtyping checks for protocols with method members (#20165)

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This commit is contained in:
Alex Waygood
2025-09-12 11:10:31 +01:00
committed by GitHub
parent bb9be263c7
commit 33b3d44ebd
5 changed files with 104 additions and 113 deletions
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48
crates/ty_python_semantic/resources/mdtest/expression/len.md
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@@ -170,10 +170,10 @@ reveal_type(len(ZeroOrOne())) # revealed: Literal[0, 1]
reveal_type(len(ZeroOrTrue())) # revealed: Literal[0, 1]
reveal_type(len(OneOrFalse())) # revealed: Literal[1, 0]
# TODO: Emit a diagnostic
# error: [invalid-argument-type] "Argument to function `len` is incorrect: Expected `Sized`, found `OneOrFoo`"
reveal_type(len(OneOrFoo())) # revealed: int
# TODO: Emit a diagnostic
# error: [invalid-argument-type] "Argument to function `len` is incorrect: Expected `Sized`, found `ZeroOrStr`"
reveal_type(len(ZeroOrStr())) # revealed: int
```
@@ -194,46 +194,6 @@ reveal_type(len(LiteralTrue())) # revealed: Literal[1]
reveal_type(len(LiteralFalse())) # revealed: Literal[0]
```
### Enums
```py
from enum import Enum, auto
from typing import Literal
class SomeEnum(Enum):
AUTO = auto()
INT = 2
STR = "4"
TUPLE = (8, "16")
INT_2 = 3_2
class Auto:
def __len__(self) -> Literal[SomeEnum.AUTO]:
return SomeEnum.AUTO
class Int:
def __len__(self) -> Literal[SomeEnum.INT]:
return SomeEnum.INT
class Str:
def __len__(self) -> Literal[SomeEnum.STR]:
return SomeEnum.STR
class Tuple:
def __len__(self) -> Literal[SomeEnum.TUPLE]:
return SomeEnum.TUPLE
class IntUnion:
def __len__(self) -> Literal[SomeEnum.INT, SomeEnum.INT_2]:
return SomeEnum.INT
reveal_type(len(Auto())) # revealed: int
reveal_type(len(Int())) # revealed: int
reveal_type(len(Str())) # revealed: int
reveal_type(len(Tuple())) # revealed: int
reveal_type(len(IntUnion())) # revealed: int
```
### Negative integers
```py
@@ -263,8 +223,8 @@ class SecondRequiredArgument:
# this is fine: the call succeeds at runtime since the second argument is optional
reveal_type(len(SecondOptionalArgument())) # revealed: Literal[0]
# TODO: Emit a diagnostic
reveal_type(len(SecondRequiredArgument())) # revealed: Literal[1]
# error: [invalid-argument-type] "Argument to function `len` is incorrect: Expected `Sized`, found `SecondRequiredArgument`"
reveal_type(len(SecondRequiredArgument())) # revealed: int
```
### No `__len__`