Type check ignored on a dictionary
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Description
Bug Report
Type check is ignored on keys and values of a dictionary when declared in a specific way.
To Reproduce
Mypy detects the error whenever Util.constructor or Util.apply is not used. But if both are used the calls to f used on the keys or values are not type checked.
Expected Behavior
error: Argument 1 has incompatible type "str"; expected "int" [arg-type] at the calls of f
Actual Behavior
Mypy does not throw arg-type errors
Your Environment
checkout playground example
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 example and reproduce the case involving Util.constructor, Util.apply, and dictionary keys or values. Trace the type-checking path for the calls to f; done means mypy reports the expected incompatible str-to-int arg-type errors.
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