[conformance suite] Update an assertion in historical_positional.py to allow an optional error#2167
Merged
AlexWaygood merged 2 commits intomainfrom Feb 9, 2026
Merged
Conversation
… to allow an optional error The comment immediately above the `f3` definition states: ```py # > Consistent with PEP 570 syntax, positional-only parameters cannot appear # > after parameters that accept keyword arguments. Type checkers should # > enforce this requirement: ``` But mandating that type checkers should permit the `f3` definition appears inconsistent with this comment. The `x` parameter of this function accepts keyword arguments, and comes before a parameter that uses the legacy convention for denoting positional-only parameters, so according to the portion of the spec quoted here I think type checkers *should* emit an error on it. This PR updates the line to allow an optional error to be emitted by type checkers (though I'd personally also be okay with mandating an error).
AlexWaygood
changed the title
historical_positional.py…historical_positional.py to allow an optional error
sinon
reviewed
Jan 31, 2026
carljm
approved these changes
Feb 2, 2026
Member
carljm
left a comment
carljm
left a comment
There was a problem hiding this comment.
I think type checkers should be allowed to reject this definition.
JelleZijlstra
approved these changes
Feb 2, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The comment immediately above the
f3definition states:But mandating that type checkers should permit the
f3definition appears inconsistent with this comment. Thexparameter of this function accepts keyword arguments, and comes before a parameter that uses the legacy convention for denoting positional-only parameters, so according to the portion of the spec quoted here I think type checkers should emit an error on it.This PR updates the line to allow an optional error to be emitted by type checkers (though I'd personally also be okay with mandating an error).