[ty] Add some additional type safety to CycleDetector#19903
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Diagnostic diff on typing conformance testsChanges were detected when running ty on typing conformance tests--- old-output.txt 2025-08-13 21:23:19.455742809 +0000
+++ new-output.txt 2025-08-13 21:23:19.524743390 +0000
@@ -1,5 +1,5 @@
WARN ty is pre-release software and not ready for production use. Expect to encounter bugs, missing features, and fatal errors.
-fatal[panic] Panicked at /home/runner/.cargo/git/checkouts/salsa-e6f3bb7c2a062968/918d35d/src/function/execute.rs:215:25 when checking `/home/runner/work/ruff/ruff/typing/conformance/tests/aliases_typealiastype.py`: `infer_definition_types(Id(c4bf)): execute: too many cycle iterations`
+fatal[panic] Panicked at /home/runner/.cargo/git/checkouts/salsa-e6f3bb7c2a062968/918d35d/src/function/execute.rs:215:25 when checking `/home/runner/work/ruff/ruff/typing/conformance/tests/aliases_typealiastype.py`: `infer_definition_types(Id(413ae)): execute: too many cycle iterations`
_directives_deprecated_library.py:15:31: error[invalid-return-type] Function always implicitly returns `None`, which is not assignable to return type `int`
_directives_deprecated_library.py:30:26: error[invalid-return-type] Function always implicitly returns `None`, which is not assignable to return type `str`
_directives_deprecated_library.py:36:41: error[invalid-return-type] Function always implicitly returns `None`, which is not assignable to return type `Self@__add__` |
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carljm
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Aug 13, 2025
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This is great, thank you!
As someone who has added a lot of visitor arguments to methods, and will be adding a lot more, I think I'd really appreciate some type aliases here, so I can say e.g. visitor: &NormalizeVisitor instead of visitor: &TypeTransformer<'db, Normalized>. But not a blocker.
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Good idea! Done |
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* main: [ty] Add some additional type safety to `CycleDetector` (#19903)
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Aug 14, 2025
* main: Feature/build riscv64 bin (#19819) [ty] Add caching to `CodeGeneratorKind::matches()` (#19912) [ty] Rename `functionArgumentNames` to `callArgumentNames` inlay hint setting (#19911) [ty] Default `ty.inlayHints.*` server settings to true (#19910) [ty] Remove py-fuzzer skips for seeds that are no longer slow (#19906) [ty] fix deferred name loading in PEP695 generic classes/functions (#19888) [ty] Add some additional type safety to `CycleDetector` (#19903) [`flake8-blind-except`] Fix `BLE001` false-positive on `raise ... from None` (#19755) [ty] resolve docstrings for modules (#19898)
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This PR adds a type tag to the
CycleDetectorvisitor (and its aliases).There are some places where we implement e.g. an equivalence check by making a disjointness check. Both
is_equivalent_toandis_disjoint_fromuse aPairVisitorto handle cycles, but they should not use the same visitor. I was finding it tedious to remember when it was appropriate to pass on a visitor and when not to. This adds aPhantomDatatype tag to ensure that we can't pass on one method's visitor to a different method.For
has_relationandapply_type_mapping, we have an existing type that we can use as the tag. For the other methods, I've added empty structs (Normalized,IsDisjointFrom,IsEquivalentTo) to use as tags.