Commit Graph

1073 Commits

Author SHA1 Message Date
Andrew Gallant 32f400a457 [ty] Make auto-import ignore symbols in modules starting with a `_`
This applies recursively. So if *any* component of a module name starts
with a `_`, then symbols from that module are excluded from auto-import.

The exception is when it's a module within first party code. Then we
want to include it in auto-import.
2025-12-04 13:21:26 -05:00
Aria Desires 6491932757
[ty] Fix crash when hovering an unknown string annotation (#21782)
## Summary

I have no idea what I'm doing with the fix (all the interesting stuff is
in the second commit).

The basic problem is the compiler emits the diagnostic:

```
x: "foobar"
    ^^^^^^
```

Which the suppression code-action hands the end of to `Tokens::after`
which then panics because that function panics if handed an offset that
is in the middle of a token.

Fixes https://github.com/astral-sh/ty/issues/1748

## Test Plan

Many tests added (only the e2e test matters).
2025-12-04 09:11:40 +01:00
Micha Reiser a9f2bb41bd
[ty] Don't send publish diagnostics for clients supporting pull diagnostics (#21772) 2025-12-04 08:12:04 +01:00
Aria Desires e2b72fbf99
[ty] cleanup test path (#21781)
Fixes
https://github.com/astral-sh/ruff/pull/21745#discussion_r2586552295
2025-12-03 21:54:50 +00:00
Alex Waygood 14fce0d440
[ty] Improve the display of various special-form types (#21775) 2025-12-03 21:19:59 +00:00
Alex Waygood 8ebecb2a88
[ty] Add subdiagnostic hint if the user wrote `X = Any` rather than `X: Any` (#21777) 2025-12-03 20:42:21 +00:00
Aria Desires 45ac30a4d7
[ty] Teach `ty` the meaning of desperation (try ancestor `pyproject.toml`s as search-paths if module resolution fails) (#21745)
## Summary

This makes an importing file a required argument to module resolution,
and if the fast-path cached query fails to resolve the module, take the
slow-path uncached (could be cached if we want)
`desperately_resolve_module` which will walk up from the importing file
until it finds a `pyproject.toml` (arbitrary decision, we could try
every ancestor directory), at which point it takes one last desperate
attempt to use that directory as a search-path. We do not continue
walking up once we've found a `pyproject.toml` (arbitrary decision, we
could keep going up).

Running locally, this fixes every broken-for-workspace-reasons import in
pyx's workspace!

* Fixes https://github.com/astral-sh/ty/issues/1539
* Improves https://github.com/astral-sh/ty/issues/839

## Test Plan

The workspace tests see a huge improvement on most absolute imports.
2025-12-03 15:04:36 -05:00
Alex Waygood 0280949000
[ty] fix panic when attempting to infer the variance of a PEP-695 class that depends on a recursive type aliases and also somehow protocols (#21778)
Fixes https://github.com/astral-sh/ty/issues/1716.

## Test plan

I added a corpus snippet that causes us to panic on `main` (I tested by
running `cargo run -p ty_python_semantic --test=corpus` without the fix
applied).
2025-12-03 19:01:42 +00:00
David Peter 1f4f8d9950
[ty] Fix flow of associated member states during star imports (#21776)
## Summary

Star-imports can not just affect the state of symbols that they pull in,
they can also affect the state of members that are associated with those
symbols. For example, if `obj.attr` was previously narrowed from `int |
None` to `int`, and a star-import now overwrites `obj`, then the
narrowing on `obj.attr` should be "reset".

This PR keeps track of the state of associated members during star
imports and properly models the flow of their corresponding state
through the control flow structure that we artificially create for
star-imports.

See [this
comment](https://github.com/astral-sh/ty/issues/1355#issuecomment-3607125005)
for an explanation why this caused ty to see certain `asyncio` symbols
as not being accessible on Python 3.14.

closes https://github.com/astral-sh/ty/issues/1355

## Ecosystem impact

```diff
async-utils (https://github.com/mikeshardmind/async-utils)
- src/async_utils/bg_loop.py:115:31: error[invalid-argument-type] Argument to bound method `set_task_factory` is incorrect: Expected `_TaskFactory | None`, found `def eager_task_factory[_T_co](loop: AbstractEventLoop | None, coro: Coroutine[Any, Any, _T_co@eager_task_factory], *, name: str | None = None, context: Context | None = None) -> Task[_T_co@eager_task_factory]`
- Found 30 diagnostics
+ Found 29 diagnostics

mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/utils/asyncio_utils.py:96:60: warning[unused-ignore-comment] Unused blanket `type: ignore` directive
- test/conftest.py:37:31: error[invalid-argument-type] Argument to bound method `set_task_factory` is incorrect: Expected `_TaskFactory | None`, found `def eager_task_factory[_T_co](loop: AbstractEventLoop | None, coro: Coroutine[Any, Any, _T_co@eager_task_factory], *, name: str | None = None, context: Context | None = None) -> Task[_T_co@eager_task_factory]`
```

All of these seem to be correct, they give us a different type for
`asyncio` symbols that are now imported from different
`sys.version_info` branches (where we previously failed to recognize
some of these as statically true/false).

```diff
dd-trace-py (https://github.com/DataDog/dd-trace-py)
- ddtrace/contrib/internal/asyncio/patch.py:39:12: error[invalid-argument-type] Argument to function `unwrap` is incorrect: Expected `WrappedFunction`, found `def create_task[_T](self, coro: Coroutine[Any, Any, _T@create_task] | Generator[Any, None, _T@create_task], *, name: object = None) -> Task[_T@create_task]`
+ ddtrace/contrib/internal/asyncio/patch.py:39:12: error[invalid-argument-type] Argument to function `unwrap` is incorrect: Expected `WrappedFunction`, found `def create_task[_T](self, coro: Generator[Any, None, _T@create_task] | Coroutine[Any, Any, _T@create_task], *, name: object = None) -> Task[_T@create_task]`
```

Similar, but only results in a diagnostic change.

## Test Plan

Added a regression test
2025-12-03 17:52:31 +01:00
github-actions[bot] b08f0b2caa
[ty] Sync vendored typeshed stubs (#21715)
Co-authored-by: typeshedbot <>
Co-authored-by: David Peter <mail@david-peter.de>
2025-12-03 15:49:51 +00:00
David Peter d6e472f297
[ty] Reachability constraints: minor documentation fixes (#21774) 2025-12-03 16:40:11 +01:00
Douglas Creager 45842cc034
[ty] Fix non-determinism in `ConstraintSet.specialize_constrained` (#21744)
This fixes a non-determinism that we were seeing in the constraint set
tests in https://github.com/astral-sh/ruff/pull/21715.

In this test, we create the following constraint set, and then try to
create a specialization from it:

```
(T@constrained_by_gradual_list = list[Base])
  ∨
(Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
```

That is, `T` is either specifically `list[Base]`, or it's any `list`.
Our current heuristics say that, absent other restrictions, we should
specialize `T` to the more specific type (`list[Base]`).

In the correct test output, we end up creating a BDD that looks like
this:

```
(T@constrained_by_gradual_list = list[Base])
┡━₁ always
└─₀ (Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
    ┡━₁ always
    └─₀ never
```

In the incorrect output, the BDD looks like this:

```
(Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
┡━₁ always
└─₀ never
```

The difference is the ordering of the two individual constraints. Both
constraints appear in the first BDD, but the second BDD only contains `T
is any list`. If we were to force the second BDD to contain both
constraints, it would look like this:

```
(Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
┡━₁ always
└─₀ (T@constrained_by_gradual_list = list[Base])
    ┡━₁ always
    └─₀ never
```

This is the standard shape for an OR of two constraints. However! Those
two constraints are not independent of each other! If `T` is
specifically `list[Base]`, then it's definitely also "any `list`". From
that, we can infer the contrapositive: that if `T` is not any list, then
it cannot be `list[Base]` specifically. When we encounter impossible
situations like that, we prune that path in the BDD, and treat it as
`false`. That rewrites the second BDD to the following:

```
(Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
┡━₁ always
└─₀ (T@constrained_by_gradual_list = list[Base])
    ┡━₁ never   <-- IMPOSSIBLE, rewritten to never
    └─₀ never
```

We then would see that that BDD node is redundant, since both of its
outgoing edges point at the `never` node. Our BDDs are _reduced_, which
means we have to remove that redundant node, resulting in the BDD we saw
above:

```
(Bottom[list[Any]] ≤ T@constrained_by_gradual_list ≤ Top[list[Any]])
┡━₁ always
└─₀ never       <-- redundant node removed
```

The end result is that we were "forgetting" about the `T = list[Base]`
constraint, but only for some BDD variable orderings.

To fix this, I'm leaning in to the fact that our BDDs really do need to
"remember" all of the constraints that they were created with. Some
combinations might not be possible, but we now have the sequent map,
which is quite good at detecting and pruning those.

So now our BDDs are _quasi-reduced_, which just means that redundant
nodes are allowed. (At first I was worried that allowing redundant nodes
would be an unsound "fix the glitch". But it turns out they're real!
[This](https://ieeexplore.ieee.org/abstract/document/130209) is the
paper that introduces them, though it's very difficult to read. Knuth
mentions them in §7.1.4 of
[TAOCP](https://course.khoury.northeastern.edu/csu690/ssl/bdd-knuth.pdf),
and [this paper](https://par.nsf.gov/servlets/purl/10128966) has a nice
short summary of them in §2.)

While we're here, I've added a bunch of `debug` and `trace` level log
messages to the constraint set implementation. I was getting tired of
having to add these by hands over and over. To enable them, just set
`TY_LOG` in your environment, e.g.

```sh
env TY_LOG=ty_python_semantic::types::constraints::SequentMap=trace ty check ...
```

[Note, this has an `internal` label because are still not using
`specialize_constrained` in anything user-facing yet.]
2025-12-03 10:19:39 -05:00
Alex Waygood cd079bd92e
[ty] Improve `@override`, `@final` and Liskov checks in cases where there are multiple reachable definitions (#21767) 2025-12-03 12:51:36 +00:00
Alex Waygood 5756b3809c
[ty] Extend `invalid-explicit-override` to also cover properties decorated with `@override` that do not override anything (#21756) 2025-12-03 11:27:47 +00:00
Micha Reiser 92c5f62ec0
[ty] Enable LRU collection for parsed module (#21749) 2025-12-03 12:16:18 +01:00
David Peter 21e5a57296
[ty] Support typevar-specialized dynamic types in generic type aliases (#21730)
## Summary

For a type alias like the one below, where `UnknownClass` is something
with a dynamic type, we previously lost track of the fact that this
dynamic type was explicitly specialized *with a type variable*. If that
alias is then later explicitly specialized itself (`MyAlias[int]`), we
would miscount the number of legacy type variables and emit a
`invalid-type-arguments` diagnostic
([playground](https://play.ty.dev/886ae6cc-86c3-4304-a365-510d29211f85)).
```py
T = TypeVar("T")

MyAlias: TypeAlias = UnknownClass[T] | None
```
The solution implemented here is not pretty, but we can hopefully get
rid of it via https://github.com/astral-sh/ty/issues/1711. Also, once we
properly support `ParamSpec` and `Concatenate`, we should be able to
remove some of this code.

This addresses many of the `invalid-type-arguments` false-positives in
https://github.com/astral-sh/ty/issues/1685. With this change, there are
still some diagnostics of this type left. Instead of implementing even
more (rather sophisticated) workarounds for these cases as well, it
might be much easier to wait for full `ParamSpec`/`Concatenate` support
and then try again.

A disadvantage of this implementation is that we lose track of some
`@Todo` types and replace them with `Unknown`. We could spend more
effort and try to preserve them, but I'm unsure if this is the best use
of our time right now.

## Test Plan

New Markdown tests.
2025-12-03 10:00:02 +01:00
Denys Zhak f4e4229683
Add token based `parenthesized_ranges` implementation (#21738)
Co-authored-by: Micha Reiser <micha@reiser.io>
2025-12-03 08:15:17 +00:00
David Peter e6ddeed386
[ty] Default-specialization of generic type aliases (#21765)
## Summary

Implement default-specialization of generic type aliases (implicit or
PEP-613) if they are used in a type expression without an explicit
specialization.

closes https://github.com/astral-sh/ty/issues/1690

## Typing conformance

```diff
-generics_defaults_specialization.py:26:5: error[type-assertion-failure] Type `SomethingWithNoDefaults[int, str]` does not match asserted type `SomethingWithNoDefaults[int, DefaultStrT]`
```

That's exactly what we want ✔️ 

All other tests in this file pass as well, with the exception of this
assertion, which is just wrong (at least according to our
interpretation, `type[Bar] != <class 'Bar'>`). I checked that we do
correctly default-specialize the type parameter which is not displayed
in the diagnostic that we raise.
```py
class Bar(SubclassMe[int, DefaultStrT]): ...

assert_type(Bar, type[Bar[str]])  # ty: Type `type[Bar[str]]` does not match asserted type `<class 'Bar'>`
```

## Ecosystem impact

Looks like I should have included this last week 😎 

## Test Plan

Updated pre-existing tests and add a few new ones.
2025-12-03 09:10:45 +01:00
Alex Waygood c5b8d551df
[ty] Suppress false positives when `dataclasses.dataclass(...)(cls)` is called imperatively (#21729)
Fixes https://github.com/astral-sh/ty/issues/1705
2025-12-03 08:05:25 +00:00
Ibraheem Ahmed 7b0aab1696
[ty] `type[T]` is assignable to an inferable typevar (#21766)
## Summary

Resolves https://github.com/astral-sh/ty/issues/1712.
2025-12-02 18:25:09 -05:00
Brent Westbrook 2250fa6f98
Fix syntax error false positives for `await` outside functions (#21763)
## Summary

Fixes #21750 and a related bug in `PLE1142`. We were not properly
considering generators to be valid `await` contexts, which caused the
`F704` issue. One of the tests I added for this also uncovered an issue
in `PLE1142` for comprehensions nested within async generators because
we were only checking the current scope rather than traversing the
nested context.

## Test Plan

Both of these rules are implemented as semantic syntax errors, so I
added tests (and fixes) in both Ruff and ty.
2025-12-02 21:02:02 +00:00
Alex Waygood 392a8e4e50
[ty] Improve diagnostics for unsupported comparison operations (#21737) 2025-12-02 19:58:45 +00:00
Micha Reiser 515de2d062
Move `Token`, `TokenKind` and `Tokens` to `ruff-python-ast` (#21760) 2025-12-02 20:10:46 +01:00
Douglas Creager 508c0a0861
[ty] Don't confuse multiple occurrences of `typing.Self` when binding bound methods (#21754)
In the following example, there are two occurrences of `typing.Self`,
one for `Foo.foo` and one for `Bar.bar`:

```py
from typing import Self, reveal_type

class Foo[T]:
    def foo(self: Self) -> T:
        raise NotImplementedError

class Bar:
    def bar(self: Self, x: Foo[Self]):
        # SHOULD BE: bound method Foo[Self@bar].foo() -> Self@bar
        # revealed: bound method Foo[Self@bar].foo() -> Foo[Self@bar]
        reveal_type(x.foo)

def f[U: Bar](x: Foo[U]):
    # revealed: bound method Foo[U@f].foo() -> U@f
    reveal_type(x.foo)
```

When accessing a bound method, we replace any occurrences of `Self` with
the bound `self` type.

We were doing this correctly for the second reveal. We would first apply
the specialization, getting `(self: Self@foo) -> U@F` as the signature
of `x.foo`. We would then bind the `self` parameter, substituting
`Self@foo` with `Foo[U@F]` as part of that. The return type was already
specialized to `U@F`, so that substitution had no further affect on the
type that we revealed.

In the first reveal, we would follow the same process, but we confused
the two occurrences of `Self`. We would first apply the specialization,
getting `(self: Self@foo) -> Self@bar` as the method signature. We would
then try to bind the `self` parameter, substituting `Self@foo` with
`Foo[Self@bar]`. However, because we didn't distinguish the two separate
`Self`s, and applied the substitution to the return type as well as to
the `self` parameter.

The fix is to track which particular `Self` we're trying to substitute
when applying the type mapping.

Fixes https://github.com/astral-sh/ty/issues/1713
2025-12-02 13:15:09 -05:00
Alex Waygood ac2552b11b
[ty] Move `all_members`, and related types/routines, out of `ide_support.rs` (#21695) 2025-12-02 14:45:24 +00:00
Micha Reiser 644096ea8a
[ty] Fix find-references for import aliases (#21736) 2025-12-02 14:37:50 +01:00
Aria Desires 015ab9e576
[ty] add tests for workspaces (#21741)
Here are a bunch of (variously failing and passing) mdtests that reflect
the kinds of issues people encounter when running ty over an entire
workspace without sufficient hand-holding (especially because in the IDE
it is unclear *how* to provide that hand-holding).
2025-12-02 06:43:41 -05:00
Douglas Creager cf4196466c
[ty] Stop testing the (brittle) constraint set display implementation (#21743)
The `Display` implementation for constraint sets is brittle, and
deserves a rethink. But later! It's perfectly fine for printf debugging;
we just shouldn't be writing mdtests that depend on any particular
rendering details. Most of these tests can be replaced with an
equivalence check that actually validates that the _behavior_ of two
constraint sets are identical.
2025-12-02 09:17:29 +01:00
Charlie Marsh 72304b01eb
[ty] Add a diagnostic for prohibited `NamedTuple` attribute overrides (#21717)
## Summary

Closes https://github.com/astral-sh/ty/issues/1684.
2025-12-01 21:46:58 -05:00
Ibraheem Ahmed ec854c7199
[ty] Fix subtyping with `type[T]` and unions (#21740)
## Summary

Resolves
https://github.com/astral-sh/ruff/pull/21685#issuecomment-3591695954.
2025-12-01 18:20:13 -05:00
Andrew Gallant a561e6659d [ty] Exclude `typing_extensions` from completions unless it's really available
This works by adding a third module resolution mode that lets the caller
opt into _some_ shadowing of modules that is otherwise not allowed (for
`typing` and `typing_extensions`).

Fixes astral-sh/ty#1658
2025-12-01 11:24:16 -05:00
Alex Waygood 0e651b50b7
[ty] Fix false positives for `class F(Generic[*Ts]): ...` (#21723) 2025-12-01 13:24:07 +00:00
David Peter 116fd7c7af
[ty] Remove `GenericAlias`-related todo type (#21728)
## Summary

If you manage to create an `typing.GenericAlias` instance without us
knowing how that was created, then we don't know what to do with this in
a type annotation. So it's better to be explicit and show an error
instead of failing silently with a `@Todo` type.

## Test Plan

* New Markdown tests
* Zero ecosystem impact
2025-12-01 13:02:38 +00:00
David Peter 5358ddae88
[ty] Exhaustiveness checking for generic classes (#21726)
## Summary

We had tests for this already, but they used generic classes that were
bivariant in their type parameter, and so this case wasn't captured.

closes https://github.com/astral-sh/ty/issues/1702

## Test Plan

Updated Markdown tests
2025-12-01 13:52:36 +01:00
Alex Waygood 3a11e714c6
[ty] Show the user where the type variable was defined in `invalid-type-arguments` diagnostics (#21727) 2025-12-01 12:25:49 +00:00
Alex Waygood a2096ee2cb
[ty] Emit `invalid-named-tuple` on namedtuple classes that have field names starting with underscores (#21697) 2025-12-01 11:36:02 +00:00
Carl Meyer c2773b4c6f
[ty] support `type[tuple[...]]` (#21652)
Fixes https://github.com/astral-sh/ty/issues/1649

## Summary

We missed this when adding support for `type[]` of a specialized
generic.

## Test Plan

Added mdtests.
2025-12-01 11:49:26 +01:00
David Peter bc6517a807
[ty] Add missing projects to `good.txt` (#21721)
## Summary

These projects from `mypy_primer` were missing from both `good.txt` and
`bad.txt` for some reason. I thought about writing a script that would
verify that `good.txt` + `bad.txt` = `mypy_primer.projects`, but that's
not completely trivial since there are projects like `cpython` only
appear once in `good.txt`. Given that we can hopefully soon get rid of
both of these files (and always run on all projects), it's probably not
worth the effort. We are usually notified of all `mypy_primer` changes.

## Test Plan

CI on this PR
2025-12-01 11:18:41 +01:00
Shunsuke Shibayama a6cbc138d2
[ty] remove the `visitor` parameter in the `recursive_type_normalized_impl` method (#21701) 2025-12-01 08:48:43 +01:00
Charlie Marsh e7beb7e1f4
[ty] Forbid use of `super()` in `NamedTuple` subclasses (#21700)
## Summary

The exact behavior around what's allowed vs. disallowed was partly
detected through trial and error in the runtime.

I was a little confused by [this
comment](https://github.com/python/cpython/pull/129352) that says
"`NamedTuple` subclasses cannot be inherited from" because in practice
that doesn't appear to error at runtime.

Closes [#1683](https://github.com/astral-sh/ty/issues/1683).
2025-11-30 15:49:06 +00:00
Alex Waygood b02e8212c9
[ty] Don't introduce invalid syntax when autofixing override-of-final-method (#21699) 2025-11-30 13:40:33 +00:00
Alex Waygood 69ace00210
[ty] Rename `types::liskov` to `types::overrides` (#21694) 2025-11-29 14:54:00 +00:00
Micha Reiser d40590c8f9
[ty] Add code action to ignore diagnostic on the current line (#21595) 2025-11-29 15:41:54 +01:00
RasmusNygren b2387f4eab
[ty] fix typo in HasDefinition trait docstring (#21689)
## Summary
Fixes a typo in the docstring for the definition method in the
HasDefinition trait
2025-11-29 11:13:54 +00:00
Dhruv Manilawala 8795d9f0cb
[ty] Split `ParamSpec` mdtests to separate legacy and PEP 695 tests (#21687)
## Summary

This is another small refactor for
https://github.com/astral-sh/ruff/pull/21445 that splits the single
`paramspec.md` into `generics/legacy/paramspec.md` and
`generics/pep695/paramspec.md`.

## Test Plan

Make sure that all mdtests pass.
2025-11-29 06:49:39 +00:00
David Peter 42f152108a
[ty] Generic types aliases (implicit and PEP 613) (#21553)
## Summary

Add support for generic PEP 613 type aliases and generic implicit type
aliases:
```py
from typing import TypeVar

T = TypeVar("T")
ListOrSet = list[T] | set[T]

def _(xs: ListOrSet[int]):
    reveal_type(xs)  # list[int] | set[int]
```

closes https://github.com/astral-sh/ty/issues/1643
closes https://github.com/astral-sh/ty/issues/1629
closes https://github.com/astral-sh/ty/issues/1596
closes https://github.com/astral-sh/ty/issues/573
closes https://github.com/astral-sh/ty/issues/221

## Typing conformance

```diff
-aliases_explicit.py:52:5: error[type-assertion-failure] Type `list[int]` does not match asserted type `@Todo(specialized generic alias in type expression)`
-aliases_explicit.py:53:5: error[type-assertion-failure] Type `tuple[str, ...] | list[str]` does not match asserted type `@Todo(Generic specialization of types.UnionType)`
-aliases_explicit.py:54:5: error[type-assertion-failure] Type `tuple[int, int, int, str]` does not match asserted type `@Todo(specialized generic alias in type expression)`
-aliases_explicit.py:56:5: error[type-assertion-failure] Type `(int, str, /) -> str` does not match asserted type `@Todo(Generic specialization of typing.Callable)`
-aliases_explicit.py:59:5: error[type-assertion-failure] Type `int | str | None | list[list[int]]` does not match asserted type `int | str | None | list[@Todo(specialized generic alias in type expression)]`
```

New true negatives ✔️ 

```diff
+aliases_explicit.py:41:36: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
-aliases_explicit.py:57:5: error[type-assertion-failure] Type `(int, str, str, /) -> None` does not match asserted type `@Todo(Generic specialization of typing.Callable)`
+aliases_explicit.py:57:5: error[type-assertion-failure] Type `(int, str, str, /) -> None` does not match asserted type `(...) -> Unknown`
```

These require `ParamSpec`

```diff
+aliases_explicit.py:67:24: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+aliases_explicit.py:68:24: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+aliases_explicit.py:69:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_explicit.py:70:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_explicit.py:71:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_explicit.py:102:20: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
```

New true positives ✔️ 

```diff
-aliases_implicit.py:63:5: error[type-assertion-failure] Type `list[int]` does not match asserted type `@Todo(specialized generic alias in type expression)`
-aliases_implicit.py:64:5: error[type-assertion-failure] Type `tuple[str, ...] | list[str]` does not match asserted type `@Todo(Generic specialization of types.UnionType)`
-aliases_implicit.py:65:5: error[type-assertion-failure] Type `tuple[int, int, int, str]` does not match asserted type `@Todo(specialized generic alias in type expression)`
-aliases_implicit.py:67:5: error[type-assertion-failure] Type `(int, str, /) -> str` does not match asserted type `@Todo(Generic specialization of typing.Callable)`
-aliases_implicit.py:70:5: error[type-assertion-failure] Type `int | str | None | list[list[int]]` does not match asserted type `int | str | None | list[@Todo(specialized generic alias in type expression)]`
-aliases_implicit.py:71:5: error[type-assertion-failure] Type `list[bool]` does not match asserted type `@Todo(specialized generic alias in type expression)`
```

New true negatives ✔️ 

```diff
+aliases_implicit.py:54:36: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
-aliases_implicit.py:68:5: error[type-assertion-failure] Type `(int, str, str, /) -> None` does not match asserted type `@Todo(Generic specialization of typing.Callable)`
+aliases_implicit.py:68:5: error[type-assertion-failure] Type `(int, str, str, /) -> None` does not match asserted type `(...) -> Unknown`
```

These require `ParamSpec`

```diff
+aliases_implicit.py:76:24: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+aliases_implicit.py:77:24: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+aliases_implicit.py:78:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_implicit.py:79:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_implicit.py:80:29: error[invalid-type-arguments] Too many type arguments: expected 1, got 2
+aliases_implicit.py:81:25: error[invalid-type-arguments] Type `str` is not assignable to upper bound `int | float` of type variable `TFloat@GoodTypeAlias12`
+aliases_implicit.py:135:20: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
```

New true positives ✔️ 

```diff
+callables_annotation.py:172:19: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+callables_annotation.py:175:19: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+callables_annotation.py:188:25: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
+callables_annotation.py:189:25: error[invalid-type-arguments] Too many type arguments: expected 0, got 1
```

These require `ParamSpec` and `Concatenate`.

```diff
-generics_defaults_specialization.py:26:5: error[type-assertion-failure] Type `SomethingWithNoDefaults[int, str]` does not match asserted type `SomethingWithNoDefaults[int, typing.TypeVar]`
+generics_defaults_specialization.py:26:5: error[type-assertion-failure] Type `SomethingWithNoDefaults[int, str]` does not match asserted type `SomethingWithNoDefaults[int, DefaultStrT]`
```

Favorable diagnostic change ✔️ 

```diff
-generics_defaults_specialization.py:27:5: error[type-assertion-failure] Type `SomethingWithNoDefaults[int, bool]` does not match asserted type `@Todo(specialized generic alias in type expression)`
```

New true negative ✔️ 

```diff
-generics_defaults_specialization.py:30:1: error[non-subscriptable] Cannot subscript object of type `<class 'SomethingWithNoDefaults[int, typing.TypeVar]'>` with no `__class_getitem__` method
+generics_defaults_specialization.py:30:15: error[invalid-type-arguments] Too many type arguments: expected between 0 and 1, got 2
```

Correct new diagnostic ✔️ 


```diff
-generics_variance.py:175:25: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:175:35: error[non-subscriptable] Cannot subscript object of type `<class 'Co[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:179:29: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:179:39: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:183:21: error[non-subscriptable] Cannot subscript object of type `<class 'Co[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:183:27: error[non-subscriptable] Cannot subscript object of type `<class 'Co[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:187:25: error[non-subscriptable] Cannot subscript object of type `<class 'Co[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:187:31: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:191:33: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:191:43: error[non-subscriptable] Cannot subscript object of type `<class 'Co[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:191:49: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:196:5: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:196:15: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
-generics_variance.py:196:25: error[non-subscriptable] Cannot subscript object of type `<class 'Contra[typing.TypeVar]'>` with no `__class_getitem__` method
```

One of these should apparently be an error, but not of this kind, so
this is good ✔️

```diff
-specialtypes_type.py:152:16: error[invalid-type-form] `typing.TypeVar` is not a generic class
-specialtypes_type.py:156:16: error[invalid-type-form] `typing.TypeVar` is not a generic class
```

Good, those were false positives. ✔️ 

I skipped the analysis for everything involving `TypeVarTuple`.

## Ecosystem impact

**[Full report with detailed
diff](https://david-generic-implicit-alias.ecosystem-663.pages.dev/diff)**

Previous iterations of this PR showed all kinds of problems. In it's
current state, I do not see any large systematic problems, but it is
hard to tell with 5k diagnostic changes.

## Performance

* There is a huge 4x regression in `colour-science/colour`, related to
[this large
file](https://github.com/colour-science/colour/blob/develop/colour/io/luts/tests/test_lut.py)
with [many assignments of hard-coded arrays (lists of lists) to
`np.NDArray`
types](83e754c8b6/colour/io/luts/tests/test_lut.py (L701-L781))
that we now understand. We now take ~2 seconds to check this file, so
definitely not great, but maybe acceptable for now.

## Test Plan

Updated and new Markdown tests
2025-11-28 20:38:24 +01:00
Alex Waygood 594b7b04d3
[ty] Preserve quoting style when autofixing `TypedDict` keys (#21682) 2025-11-28 18:40:34 +00:00
Matthew Mckee b5b4917d7f
[ty] Fix override of final method summary (#21681) 2025-11-28 16:18:22 +00:00
David Peter 0084e94f78
[ty] Fix subtyping of `type[Any]` / `type[T]` and protocols (#21678)
## Summary

This is a bugfix for subtyping of `type[Any]` / `type[T]` and protocols.

## Test Plan

Regression test that will only be really meaningful once
https://github.com/astral-sh/ruff/pull/21553 lands.
2025-11-28 16:56:22 +01:00
Alex Waygood 8bcfc198b8
[ty] Implement `typing.final` for methods (#21646)
Co-authored-by: Micha Reiser <micha@reiser.io>
2025-11-28 15:18:02 +00:00