8 commits

Author	SHA1	Message	Date
Alex Waygood	e44c489273	[ty] Fix false positives when subscripting an object inferred as having an Intersection type (#18920)	2025-06-24 18:39:02 +00:00
Suneet Tipirneni	ef8281b695	[ty] add support for mapped union and intersection subscript loads (#18846) ... ## Summary Note this modifies the diagnostics a bit. Previously performing subscript access on something like `NotSubscriptable1 | NotSubscriptable2` would report the full type as not being subscriptable: ``` [non-subscriptable] "Cannot subscript object of type `NotSubscriptable1 | NotSubscriptable2` with no `__getitem__` method" ``` Now each erroneous constituent has a separate error: ``` [non-subscriptable] "Cannot subscript object of type `NotSubscriptable2` with no `__getitem__` method" [non-subscriptable] "Cannot subscript object of type `NotSubscriptable1` with no `__getitem__` method" ``` Closes https://github.com/astral-sh/ty/issues/625 ## Test Plan mdtest --------- Co-authored-by: Carl Meyer <carl@astral.sh>	2025-06-23 16:38:01 +00:00
Douglas Creager	ea812d0813	[ty] Homogeneous and mixed tuples (#18600) ... We already had support for homogeneous tuples (`tuple[int, ...]`). This PR extends this to also support mixed tuples (`tuple[str, str, *tuple[int, ...], str str]`). A mixed tuple consists of a fixed-length (possibly empty) prefix and suffix, and a variable-length portion in the middle. Every element of the variable-length portion must be of the same type. A homogeneous tuple is then just a mixed tuple with an empty prefix and suffix. The new data representation uses different Rust types for a fixed-length (aka heterogeneous) tuple. Another option would have been to use the `VariableLengthTuple` representation for all tuples, and to wrap the "variable + suffix" portion in an `Option`. I don't think that would simplify the method implementations much, though, since we would still have a 2×2 case analysis for most of them. One wrinkle is that the definition of the `tuple` class in the typeshed has a single typevar, and canonically represents a homogeneous tuple. When getting the class of a tuple instance, that means that we have to summarize our detailed mixed tuple type information into its "homogeneous supertype". (We were already doing this for heterogeneous types.) A similar thing happens when concatenating two mixed tuples: the variable-length portion and suffix of the LHS, and the prefix and variable-length portion of the RHS, all get unioned into the variable-length portion of the result. The LHS prefix and RHS suffix carry through unchanged. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>	2025-06-20 18:23:54 -04:00
Alex Waygood	d02c9ada5d	[ty] Do not carry the generic context of Protocol or Generic in the ClassBase enum (#17989) ... ## Summary It doesn't seem to be necessary for our generics implementation to carry the `GenericContext` in the `ClassBase` variants. Removing it simplifies the code, fixes many TODOs about `Generic` or `Protocol` appearing multiple times in MROs when each should only appear at most once, and allows us to more accurately detect runtime errors that occur due to `Generic` or `Protocol` appearing multiple times in a class's bases. In order to remove the `GenericContext` from the `ClassBase` variant, it turns out to be necessary to emulate `typing._GenericAlias.__mro_entries__`, or we end up with a large number of false-positive `inconsistent-mro` errors. This PR therefore also does that. Lastly, this PR fixes the inferred MROs of PEP-695 generic classes, which implicitly inherit from `Generic` even if they have no explicit bases. ## Test Plan mdtests	2025-05-22 21:37:03 -04:00
Alex Waygood	55df9271ba	[ty] Understand homogeneous tuple annotations (#17998)	2025-05-12 22:02:25 -04:00
Alex Waygood	d1bb10a66b	[ty] Understand classes that inherit from subscripted Protocol[] as generic (#17832)	2025-05-09 17:39:15 +01:00
Charlie Marsh	a2e9a7732a	Update class literal display to use <class 'Foo'> style (#17889) ... ## Summary Closes https://github.com/astral-sh/ruff/issues/17238.	2025-05-06 20:11:25 -04:00
Micha Reiser	b51c4f82ea	Rename Red Knot (#17820)	2025-05-03 19:49:15 +02:00

Renamed from crates/red_knot_python_semantic/resources/mdtest/subscript/tuple.md (Browse further)