bogus complaint when checking Callable arguments
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Description
Bug Report
mypy complains about correct code. it confuses the arguments to a Callable parameter with the return value of the function.
To Reproduce
https://gist.github.com/mypy-play/59b8705d6737e1f8f4855d7b2270e7e9
Expected Behavior
Code checks OK.
Actual Behavior
Bogus error:
Argument 1 to "test" has incompatible type "Callable[[str], bool]"; expected "Callable[[float | str], bool]" [arg-type]
Your Environment
mypy 1.15.0 (compiled: yes)
Python 3.13.2
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked mypy-play reproduction and run it using mypy 1.15.0 on Python 3.13.2. Investigate why the Callable argument is compared against the function's return value; done means the reproduction type-checks without the reported arg-type error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100