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[ty] Fix incorrect diagnostic when calling __setitem__ (#19645)

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## Summary

Resolves https://github.com/astral-sh/ty/issues/862 by not emitting a
diagnostic.

## Test Plan

Add test to show we don't emit the diagnostic
This commit is contained in:
Matthew Mckee
2025-07-30 19:34:52 +01:00
committed by GitHub
parent 7b4103bcb6
commit 4739bc8d14
3 changed files with 35 additions and 19 deletions
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19
crates/ty_python_semantic/resources/mdtest/subscript/instance.md
View File

@@ -1,6 +1,6 @@
# Instance subscript
## Getitem unbound
## `__getitem__` unbound
```py
class NotSubscriptable: ...
@@ -8,7 +8,7 @@ class NotSubscriptable: ...
a = NotSubscriptable()[0] # error: "Cannot subscript object of type `NotSubscriptable` with no `__getitem__` method"
```
## Getitem not callable
## `__getitem__` not callable
```py
class NotSubscriptable:
@@ -18,7 +18,7 @@ class NotSubscriptable:
a = NotSubscriptable()[0]
```
## Valid getitem
## Valid `__getitem__`
```py
class Identity:
@@ -28,7 +28,7 @@ class Identity:
reveal_type(Identity()[0]) # revealed: int
```
## Getitem union
## `__getitem__` union
```py
def _(flag: bool):
@@ -42,3 +42,14 @@ def _(flag: bool):
reveal_type(Identity()[0]) # revealed: int | str
```
## `__setitem__` with no `__getitem__`
```py
class NoGetitem:
def __setitem__(self, index: int, value: int) -> None:
pass
a = NoGetitem()
a[0] = 0
```