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[red-knot] detect invalid return type (#16540)

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## Summary

This PR closes #16248.

If the return type of the function isn't assignable to the one
specified, an `invalid-return-type` error occurs.
I thought it would be better to report this as a different kind of error
than the `invalid-assignment` error, so I defined this as a new error.

## Test Plan

All type inconsistencies in the test cases have been replaced with
appropriate ones.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
This commit is contained in:
Shunsuke Shibayama
2025-03-12 10:58:59 +09:00
committed by GitHub
parent e17cd350b6
commit 78b5f0b165
43 changed files with 983 additions and 103 deletions
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6
crates/red_knot_python_semantic/resources/mdtest/binary/instances.md
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@@ -406,10 +406,12 @@ A left-hand dunder method doesn't apply for the right-hand operand, or vice vers
```py
class A:
def __add__(self, other) -> int: ...
def __add__(self, other) -> int:
return 1
class B:
def __radd__(self, other) -> int: ...
def __radd__(self, other) -> int:
return 1
class C: ...