cached runs of dmypy stop reporting "unused type: ignore" warnings
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Description
Using mypy 0.782, I run
dmypy run .
on my codebase. The first time it runs, it correctly reports a few
error: unused 'type: ignore' comment
same as mypy. However, when rerunning dmypy run ., these errors disappear, while all other errors remain.
For some reason, this type of warning (warn_unused_ignores) seems to be missed sometimes when using the cache.
Unfortunately, it doesn't seem trivial to reproduce, so I can't give a reproducible project right now...
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 at the dmypy run . entry point and investigate how cached runs handle warn_unused_ignores compared with the initial run. Reproduce the difference if possible by running dmypy run . twice on a codebase containing unused type: ignore comments; done means those warnings remain consistent across cached and uncached runs.
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
- Needs clarification
- Newbie friendliness
- 35/100