(🐞) Wrong column number for name-defined when assigning to same symbol
Open
Nobody has claimed this yet.
bug
topic-error-reporting
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
C = C
main.py:1:1: error: Name "C" is not defined
Pretty niche imo.
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 by reproducing the diagnostic from the main.py example, then trace how mypy reports the undefined name in the self-assignment case. Done means the error points to the correct column for C = C, with a regression test covering this example.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100