mirrors/ruff
1
0
Fork 0
mirror of https://github.com/astral-sh/ruff.git synced 2025-09-29 21:34:57 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 3

[ty] Avoid duplicate diagnostic in unpacking (#18897)

Browse source 
## Summary

This PR fixes astral-sh/ty#185 by avoiding to infer the value expression
for an unpacking.

This is done simply by only inferring the value expression in a
non-unpacking branch for assignment statement, for statement, with
statement and comprehensions.

This is a simpler alternative to
https://github.com/astral-sh/ruff/pull/18890 which I only realized in
hindsight! Ideally, the solution would to consider the "unpack" as it's
own region and do all of the inference of every expressions involved in
an unpacking inside the unpack query and then merge the results in the
outer query. This would require access to the `Unpack` ingredient which
is stored on the `Definition`. And, this would require create the said
`Definition`s for all attributes and subscript expressions. It does
simplify the target inference logic by streamlining it into a single
`infer_target` method instead of the `infer_target`/`infer_target_impl`
split.

Additionally, #18890 also solves a couple of TODOs around raising errors
around attribute / subscript assignment.

## Test Plan

Update the existing test, go through a couple of ecosystem diagnostic.
This commit is contained in:
Dhruv Manilawala 2025-06-24 07:49:44 +05:30 • committed by GitHub
parent da16e00751
commit e474f36473
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
2 changed files with 52 additions and 45 deletions
Download patch file Download diff file Expand all files Collapse all files

3
crates/ty_python_semantic/resources/mdtest/unpacking.md
View file

@ -734,9 +734,6 @@ with ContextManager() as (a, *b):
### Unbound context manager expression
```py
# TODO: should only be one diagnostic
# error: [unresolved-reference] "Name `nonexistant` used when not defined"
# error: [unresolved-reference] "Name `nonexistant` used when not defined"
# error: [unresolved-reference] "Name `nonexistant` used when not defined"
with nonexistant as (x, y):
reveal_type(x) # revealed: Unknown