[ty] Pass the generic context through the decorator#22544
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dhruvmanila merged 5 commits intomainfrom Jan 23, 2026
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Typing conformance resultsThe percentage of diagnostics emitted that were expected errors increased from 77.47% to 77.51%. The percentage of expected errors that received a diagnostic decreased from 60.67% to 60.49%. Summary
False positives removedDetails
True positives removedDetails
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| Lint rule | Added | Removed | Changed |
|---|---|---|---|
invalid-argument-type |
0 | 89 | 14 |
invalid-return-type |
5 | 0 | 6 |
invalid-assignment |
0 | 5 | 1 |
invalid-await |
0 | 0 | 6 |
| Total | 5 | 94 | 27 |
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Jan 30, 2026
* main: (62 commits) [`refurb`] Do not add `abc.ABC` if already present (`FURB180`) (#22234) [ty] Add a new `assert-type-unspellable-subtype` diagnostic (#22815) [ty] Avoid duplicate syntax errors for `await` outside functions (#22826) [ty] Fix unary operator false-positive for constrained TypeVars (#22783) [ty] Fix binary operator false-positive for constrained TypeVars (#22782) [ty] Fix false-positive `unsupported-operator` for "symmetric" TypeVars (#22756) [`pydocstyle`] Clarify which quote styles are allowed (`D300`) (#22825) [ty] Use distributed versions of AND and OR on constraint sets (#22614) [ty] Add support for dict literals and dict() calls as default values for parameters with TypedDict types (#22161) Document `-` stdin convention in CLI help text (#22817) [ty] Make `infer_subscript_expression_types` a method on `Type` (#22731) [ty] Simplify `OverloadLiteral::spans` and `OverloadLiteral::parameter_span` (#22823) [ty] Require both `*args` and `**kwargs` when calling a `ParamSpec` callable (#22820) [ty] Handle tagged errors in conformance (#22746) Add `--color` cli option to force colored output (#22806) Identify notebooks by LSP didOpen instead of `.ipynb` file extension (#22810) [ty] Fix docstring rendering for literal blocks after doctests (#22676) [ty] Update salsa to fix out-of-order query validation (#22498) [ty] Inline cycle initial and recovery functions (#22814) [ty] Pass the generic context through the decorator (#22544) ...
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Summary
fixes: astral-sh/ty#2336
fixes: astral-sh/ty#2382
This PR fixes a bug where the generic context was not being passed through the decorator via the
ParamSpectype variable. For example:This meant that after the decorator has been applied, the
Callablecorresponding to theParamSpectype variable did not preserve the generic context from the decorated function, which lead tofooloosing the generic context.Test Plan
Add new mdtest cases.
Typing conformance result
The false positive that's removed is correct.
The true positives that are removed isn't correct but it's unrelated to this PR (related to astral-sh/ty#623). The case is:
Here, the
r9call has two arguments and the corresponding parameters have the same type variable. Pyright specializes using the first argument and errors on the second argument while ty currently union the constraints i.e.,T: Unknown | int | str(UnknownbecauseTis inside alist).