The constraint representation that we added in #19997 was subtly wrong,
in that it didn't correctly model that type assignability is a _partial_
order — it's possible for two types to be incomparable, with neither a
subtype of the other. That means the negation of a constraint like `T ≤
t` (typevar `T` must be a subtype of `t`) is **_not_** `t < T`, but
rather `t < T ∨ T ≁ t` (using ≁ to mean "not comparable to").
That means we need to update our constraint representation to be an
enum, so that we can track both _range_ constraints (upper/lower bound
on the typevar), and these new _incomparable_ constraints.
Since we need an enum now, that also lets us simplify how we were
modeling range constraints. Before, we let the lower/upper bounds be
either open (<) or closed (≤). Now, range constraints are always closed,
and we add a third kind of constraint for _not equivalent_ (≠). We can
translate an open upper bound `T < t` into `T ≤ t ∧ T ≠ t`.
We already had the logic for doing adding _clauses_ to a _set_ by doing
a pairwise simplification. We copy that over to where we add
_constraints_ to a _clause_. To calculate the intersection or union of
two constraints, the new enum representation makes it easy to break down
all of the possibilities into a small number of cases: intersect range
with range, intersect range with not-equivalent, etc. I've done the math
[here](https://dcreager.net/theory/constraints/) to show that the
simplifications for each of these cases is correct.
## Summary
Resolves#19357
Skip UP008 diagnostic for `builtins.super(P, self)` calls when
`__class__` is not referenced locally, preventing incorrect fixes.
**Note:** I haven't found concrete information about which cases
`__class__` will be loaded into the scope. Let me know if anyone has
references, it would be useful to enhance the implementation. I did a
lot of tests to determine when `__class__` is loaded. Considered
sources:
1. [Python doc
super](https://docs.python.org/3/library/functions.html#super)
2. [Python doc classes](https://docs.python.org/3/tutorial/classes.html)
3. [pep-3135](https://peps.python.org/pep-3135/#specification)
As I understand it, Python will inject at runtime into local scope a
`__class__` variable if it detects references to `super` or `__class__`.
This allows calling `super()` and passing appropriate parameters.
However, the compiler doesn't do the same for `builtins.super`, so we
need to somehow introduce `__class__` into the local scope.
I figured out `__class__` will be in scope with valid value when two
conditions are met:
1. `super` or `__class__` names have been loaded within function scope
4. `__class__` is not overridden.
I think my solution isn't elegant, so I would be appreciate a detailed
review.
## Test Plan
Added 19 test cases, updated snapshots.
---------
Co-authored-by: Igor Drokin <drokinii1017@gmail.com>
- Renames functions to drop `expect_` from names.
- Make functions return `Option<LineColumn>` to appropriately signal
when range is not available.
- Update existing consumers to use `unwrap_or_default()`. Uncertain if
there are better fallback behaviors for individual consumers.
This adds a new `backend: internal | uv` option to the LSP
`FormatOptions` allowing users to perform document and range formatting
operations though uv. The idea here is to prototype a solution for users
to transition to a `uv format` command without encountering version
mismatches (and consequently, formatting differences) between the LSP's
version of `ruff` and uv's version of `ruff`.
The primarily alternative to this would be to use uv to discover the
`ruff` version used to start the LSP in the first place. However, this
would increase the scope of a minimal `uv format` command beyond "run a
formatter", and raise larger questions about how uv should be used to
coordinate toolchain discovery. I think those are good things to
explore, but I'm hesitant to let them block a `uv format`
implementation. Another downside of using uv to discover `ruff`, is that
it needs to be implemented _outside_ the LSP; e.g., we'd need to change
the instructions on how to run the LSP and implement it in each editor
integration, like the VS Code plugin.
---------
Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>
Specifically, the [`if_not_else`] lint will sometimes flag
code to change the order of `if` and `else` bodies if this
would allow a `!` to be removed. While perhaps tasteful in
some cases, there are many cases in my experience where this
bows to other competing concerns that impact readability.
(Such as the relative sizes of the `if` and `else` bodies,
or perhaps an ordering that just makes the code flow in a
more natural way.)
[`if_not_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#/if_not_else
## Summary
This is a follow-up to https://github.com/astral-sh/ruff/pull/19321.
Now lazy snapshots are updated to take into account new bindings on
every symbol reassignment.
```python
def outer(x: A | None):
if x is None:
x = A()
reveal_type(x) # revealed: A
def inner() -> None:
# lazy snapshot: {x: A}
reveal_type(x) # revealed: A
inner()
def outer() -> None:
x = None
x = 1
def inner() -> None:
# lazy snapshot: {x: Literal[1]} -> {x: Literal[1, 2]}
reveal_type(x) # revealed: Literal[1, 2]
inner()
x = 2
```
Closesastral-sh/ty#559.
## Test Plan
Some TODOs in `public_types.md` now work properly.
---------
Co-authored-by: Carl Meyer <carl@astral.sh>
## Summary
Adds support for generic PEP695 type aliases, e.g.,
```python
type A[T] = T
reveal_type(A[int]) # A[int]
```
Resolves https://github.com/astral-sh/ty/issues/677.
## Summary
Support cases like the following, where we need the generic context to
include both `Self` and `T` (not just `T`):
```py
from typing import Self
class C:
def method[T](self: Self, arg: T): ...
C().method(1)
```
closes https://github.com/astral-sh/ty/issues/1131
## Test Plan
Added regression test
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## Summary
Noticed this was not escaped when writing a project that parses the
result of `ruff rule --outputformat json`. This is visible here:
<https://docs.astral.sh/ruff/rules/mixed-case-variable-in-global-scope/#why-is-this-bad>
## Test Plan
documentation only
---------
Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>
## Summary
Pr #11919 changed the fuzz build from `taiki-e/install-action` to
`cargo-bins/cargo-binstall` for necessary reasons of version selection.
But it left the `with:` parameter, which the `binstall` action does not
support. As a result, all workflow runs are showing a warning:
> Unexpected input(s) `'tool'`, valid inputs are `['']`
Eliminate the warning by removing the `with` parameter.
## Test Plan
Run CI, determine that the "cargo fuzz build" step no longer includes an
Annotation showing the warning message (quoted above).
This PR contains the following updates:
| Package | Type | Update | Change |
|---|---|---|---|
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This PR contains the following updates:
| Package | Type | Update | Change |
|---|---|---|---|
| [clap](https://redirect.github.com/clap-rs/clap) |
workspace.dependencies | patch | `4.5.46` -> `4.5.47` |
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##### Features
- Added `impl FromArgMatches for ()`
- Added `impl Args for ()`
- Added `impl Subcommand for ()`
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- Added `impl Subcommand for Infallible`
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## Summary
The sub-checks for assignability and subtyping of materializations
performed in `has_relation_in_invariant_position` and
`is_subtype_in_invariant_position` need to propagate the
`HasRelationToVisitor`, or we can stack overflow.
A side effect of this change is that we also propagate the
`ConstraintSet` through, rather than using `C::from_bool`, which I think
may also become important for correctness in cases involving type
variables (though it isn't testable yet, since we aren't yet actually
creating constraints other than always-true and always-false.)
## Test Plan
Added mdtest (derived from code found in pydantic) which
stack-overflowed before this PR.
With this change incorporated, pydantic now checks successfully on my
draft PR for PEP 613 TypeAlias support.
Now that https://github.com/astral-sh/ruff/pull/20263 is merged, we can
update mypy_primer and add the new `egglog-python` project to
`good.txt`. The ecosystem-analyzer run shows that we now add 1,356
diagnostics (where we had over 5,000 previously, due to the unsupported
project layout).
## Summary
I felt it was safer to add the `python` folder *in addition* to a
possibly-existing `src` folder, even though the `src` folder only
contains Rust code for `maturin`-based projects. There might be
non-maturin projects where a `python` folder exists for other reasons,
next to a normal `src` layout.
closes https://github.com/astral-sh/ty/issues/1120
## Test Plan
Tested locally on the egglog-python project.
## Summary
Add backreferences to the original item declaration in TypedDict
diagnostics.
Thanks to @AlexWaygood for the suggestion.
## Test Plan
Updated snapshots
## Summary
An annotated assignment `name: annotation` without a right-hand side was
previously not covered by the range returned from
`DefinitionKind::full_range`, because we did expand the range to include
the right-hand side (if there was one), but failed to include the
annotation.
## Test Plan
Updated snapshot tests
## Summary
Add support for `typing.ReadOnly` as a type qualifier to mark
`TypedDict` fields as being read-only. If you try to mutate them, you
get a new diagnostic:
<img width="787" height="234" alt="image"
src="https://github.com/user-attachments/assets/f62fddf9-4961-4bcd-ad1c-747043ebe5ff"
/>
## Test Plan
* New Markdown tests
* The typing conformance changes are all correct. There are some false
negatives, but those are related to the missing support for the
functional form of `TypedDict`, or to overriding of fields via
inheritance. Both of these topics are tracked in
https://github.com/astral-sh/ty/issues/154
Closesastral-sh/ty#456. Part of astral-sh/ty#994.
After all the foundational work, this is only a small change, but let's
see if it exposes any unresolved issues.
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