Fix panic on access to definitions after analyzing definitions - #23588

… (`PLR1712`) (#22205)"

This is an alternative to #23588, checking the ecosystem results in comparison.

Released on 2026-03-19.

- Display output severity in preview ([#23845](astral-sh/ruff#23845))
- Don't show `noqa` hover for non-Python documents ([#24040](astral-sh/ruff#24040))

- \[`pycodestyle`] Recognize `pyrefly:` as a pragma comment (`E501`) ([#24019](astral-sh/ruff#24019))

- Don't return code actions for non-Python documents ([#23905](astral-sh/ruff#23905))

- Add company AI policy to contributing guide ([#24021](astral-sh/ruff#24021))
- Document editor features for Markdown code formatting ([#23924](astral-sh/ruff#23924))
- \[`pylint`] Improve phrasing (`PLC0208`) ([#24033](astral-sh/ruff#24033))

- Use PEP 639 license information ([#19661](astral-sh/ruff#19661))

- [@tmimmanuel](https://github.com/tmimmanuel)
- [@DimitriPapadopoulos](https://github.com/DimitriPapadopoulos)
- [@amyreese](https://github.com/amyreese)
- [@statxc](https://github.com/statxc)
- [@dylwil3](https://github.com/dylwil3)
- [@hunterhogan](https://github.com/hunterhogan)
- [@renovate](https://github.com/renovate)

Released on 2026-03-12.

- Add support for `lazy` import parsing ([#23755](astral-sh/ruff#23755))
- Add support for star-unpacking of comprehensions (PEP 798) ([#23788](astral-sh/ruff#23788))
- Reject semantic syntax errors for lazy imports ([#23757](astral-sh/ruff#23757))
- Drop a few rules from the preview default set ([#23879](astral-sh/ruff#23879))
- \[`airflow`] Flag `Variable.get()` calls outside of task execution context (`AIR003`) ([#23584](astral-sh/ruff#23584))
- \[`airflow`] Flag runtime-varying values in DAG/task constructor arguments (`AIR304`) ([#23631](astral-sh/ruff#23631))
- \[`flake8-bugbear`] Implement `delattr-with-constant` (`B043`) ([#23737](astral-sh/ruff#23737))
- \[`flake8-tidy-imports`] Add `TID254` to enforce lazy imports ([#23777](astral-sh/ruff#23777))
- \[`flake8-tidy-imports`] Allow users to ban lazy imports with `TID254` ([#23847](astral-sh/ruff#23847))
- \[`isort`] Retain `lazy` keyword when sorting imports ([#23762](astral-sh/ruff#23762))
- \[`pyupgrade`] Add `from __future__ import annotations` automatically (`UP006`) ([#23260](astral-sh/ruff#23260))
- \[`refurb`] Support `newline` parameter in `FURB101` for Python 3.13+ ([#23754](astral-sh/ruff#23754))
- \[`ruff`] Add `os-path-commonprefix` (`RUF071`) ([#23814](astral-sh/ruff#23814))
- \[`ruff`] Add unsafe fix for os-path-commonprefix (`RUF071`) ([#23852](astral-sh/ruff#23852))
- \[`ruff`] Limit `RUF036` to typing contexts; make it unsafe for non-typing-only ([#23765](astral-sh/ruff#23765))
- \[`ruff`] Use starred unpacking for `RUF017` in Python 3.15+ ([#23789](astral-sh/ruff#23789))

- Fix `--add-noqa` creating unwanted leading whitespace ([#23773](astral-sh/ruff#23773))
- Fix `--add-noqa` breaking shebangs ([#23577](astral-sh/ruff#23577))
- \[formatter] Fix lambda body formatting for multiline calls and subscripts ([#23866](astral-sh/ruff#23866))
- \[formatter] Preserve required annotation parentheses in annotated assignments ([#23865](astral-sh/ruff#23865))
- \[formatter] Preserve type-expression parentheses in the formatter ([#23867](astral-sh/ruff#23867))
- \[`flake8-annotations`] Fix stack overflow in `ANN401` on quoted annotations with escape sequences ([#23912](astral-sh/ruff#23912))
- \[`pep8-naming`] Check naming conventions in `match` pattern bindings (`N806`, `N815`, `N816`) ([#23899](astral-sh/ruff#23899))
- \[`perflint`] Fix comment duplication in fixes (`PERF401`, `PERF403`) ([#23729](astral-sh/ruff#23729))
- \[`pyupgrade`] Properly trigger `super` change in nested class (`UP008`) ([#22677](astral-sh/ruff#22677))
- \[`ruff`] Avoid syntax errors in `RUF036` fixes ([#23764](astral-sh/ruff#23764))

- \[`flake8-bandit`] Flag `S501` with `requests.request` ([#23873](astral-sh/ruff#23873))
- \[`flake8-executable`] Fix WSL detection in non-Docker containers ([#22879](astral-sh/ruff#22879))
- \[`flake8-print`] Ignore `pprint` calls with `stream=` ([#23787](astral-sh/ruff#23787))

- Update docs for Markdown code block formatting ([#23871](astral-sh/ruff#23871))
- \[`flake8-bugbear`] Fix misleading description for `B904` ([#23731](astral-sh/ruff#23731))

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- [@getehen](https://github.com/getehen)
- [@Dev-iL](https://github.com/Dev-iL)

Released on 2026-03-05.

- Discover Markdown files by default in preview mode ([#23434](astral-sh/ruff#23434))
- \[`perflint`] Extend `PERF102` to comprehensions and generators ([#23473](astral-sh/ruff#23473))
- \[`refurb`] Fix `FURB101` and `FURB103` false positives when I/O variable is used later ([#23542](astral-sh/ruff#23542))
- \[`ruff`] Add fix for `none-not-at-end-of-union` (`RUF036`) ([#22829](astral-sh/ruff#22829))
- \[`ruff`] Fix false positive for `re.split` with empty string pattern (`RUF055`) ([#23634](astral-sh/ruff#23634))

- \[`fastapi`] Handle callable class dependencies with `__call__` method (`FAST003`) ([#23553](astral-sh/ruff#23553))
- \[`pydocstyle`] Fix numpy section ordering (`D420`) ([#23685](astral-sh/ruff#23685))
- \[`pyflakes`] Fix false positive for names shadowing re-exports (`F811`) ([#23356](astral-sh/ruff#23356))
- \[`pyupgrade`] Avoid inserting redundant `None` elements in `UP045` ([#23459](astral-sh/ruff#23459))

- Document extension mapping for Markdown code formatting ([#23574](astral-sh/ruff#23574))
- Update default Python version examples ([#23605](astral-sh/ruff#23605))

- Publish releases to Astral mirror ([#23616](astral-sh/ruff#23616))

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Released on 2026-02-26.

This is a follow-up release to 0.15.3 that resolves a panic when the new rule `PLR1712` was enabled with any rule that analyzes definitions, such as many of the `ANN` or `D` rules.

- Fix panic on access to definitions after analyzing definitions ([#23588](astral-sh/ruff#23588))
- \[`pyflakes`] Suppress false positive in `F821` for names used before `del` in stub files ([#23550](astral-sh/ruff#23550))

- Clarify first-party import detection in Ruff ([#23591](astral-sh/ruff#23591))
- Fix incorrect `import-heading` example ([#23568](astral-sh/ruff#23568))

- [@stakeswky](https://github.com/stakeswky)
- [@ntBre](https://github.com/ntBre)
- [@thejcannon](https://github.com/thejcannon)
- [@GeObts](https://github.com/GeObts)

Released on 2026-02-26.

- Drop explicit support for `.qmd` file extension ([#23572](astral-sh/ruff#23572))

  This can now be enabled instead by setting the [`extension`](https://docs.astral.sh/ruff/settings/#extension) option:

  ```toml
  # ruff.toml
  extension = { qmd = "markdown" }

  # pyproject.toml
  [tool.ruff]
  extension = { qmd = "markdown" }
  ```

- Include configured extensions in file discovery ([#23400](astral-sh/ruff#23400))

- \[`flake8-bandit`] Allow suspicious imports in `TYPE_CHECKING` blocks (`S401`-`S415`) ([#23441](astral-sh/ruff#23441))

- \[`flake8-bugbear`] Allow `B901` in pytest hook wrappers ([#21931](astral-sh/ruff#21931))

- \[`flake8-import-conventions`] Add missing conventions from upstream (`ICN001`, `ICN002`) ([#21373](astral-sh/ruff#21373))

- \[`pydocstyle`] Add rule to enforce docstring section ordering (`D420`) ([#23537](astral-sh/ruff#23537))

- \[`pylint`] Implement `swap-with-temporary-variable` (`PLR1712`) ([#22205](astral-sh/ruff#22205))

- \[`ruff`] Add `unnecessary-assign-before-yield` (`RUF070`) ([#23300](astral-sh/ruff#23300))

- \[`ruff`] Support file-level noqa in `RUF102` ([#23535](astral-sh/ruff#23535))

- \[`ruff`] Suppress diagnostic for invalid f-strings before Python 3.12 (`RUF027`) ([#23480](astral-sh/ruff#23480))

- \[`flake8-bandit`] Don't flag `BaseLoader`/`CBaseLoader` as unsafe (`S506`) ([#23510](astral-sh/ruff#23510))

- Avoid infinite loop between `I002` and `PYI025` ([#23352](astral-sh/ruff#23352))
- \[`pyflakes`] Fix false positive for `@overload` from `lint.typing-modules` (`F811`) ([#23357](astral-sh/ruff#23357))
- \[`pyupgrade`] Fix false positive for `TypeVar` default before Python 3.12 (`UP046`) ([#23540](astral-sh/ruff#23540))
- \[`pyupgrade`] Fix handling of `\N` in raw strings (`UP032`) ([#22149](astral-sh/ruff#22149))

- Render sub-diagnostics in the GitHub output format ([#23455](astral-sh/ruff#23455))

- \[`flake8-bugbear`] Tag certain `B007` diagnostics as unnecessary ([#23453](astral-sh/ruff#23453))

- \[`ruff`] Ignore unknown rule codes in `RUF100` ([#23531](astral-sh/ruff#23531))

  These are now flagged by [`RUF102`](https://docs.astral.sh/ruff/rules/invalid-rule-code/) instead.

- Fix missing settings links for several linters ([#23519](astral-sh/ruff#23519))
- Update isort action comments heading ([#23515](astral-sh/ruff#23515))
- \[`pydocstyle`] Fix double comma in description of `D404` ([#23440](astral-sh/ruff#23440))

- Update the Python module (notably `find_ruff_bin`) for parity with uv ([#23406](astral-sh/ruff#23406))

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- [@denyszhak](https://github.com/denyszhak)
- [@amyreese](https://github.com/amyreese)
- [@carljm](https://github.com/carljm)
- [@anishgirianish](https://github.com/anishgirianish)
- [@Bnyro](https://github.com/Bnyro)
- [@danparizher](https://github.com/danparizher)
- [@ntBre](https://github.com/ntBre)
- [@gcomneno](https://github.com/gcomneno)
- [@jaap3](https://github.com/jaap3)
- [@stakeswky](https://github.com/stakeswky)

Released on 2026-02-19.

- Expand the default rule set ([#23385](astral-sh/ruff#23385))

  In preview, Ruff now enables a significantly expanded default rule set of 412
  rules, up from the stable default set of 59 rules. The new rules are mostly a
  superset of the stable defaults, with the exception of these rules, which are
  removed from the preview defaults:

  - [`multiple-imports-on-one-line`](https://docs.astral.sh/ruff/rules/multiple-imports-on-one-line) (`E401`)
  - [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file) (`E402`)
  - [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file) (`E701`)
  - [`multiple-statements-on-one-line-semicolon`](https://docs.astral.sh/ruff/rules/multiple-statements-on-one-line-semicolon) (`E702`)
  - [`useless-semicolon`](https://docs.astral.sh/ruff/rules/useless-semicolon) (`E703`)
  - [`none-comparison`](https://docs.astral.sh/ruff/rules/none-comparison) (`E711`)
  - [`true-false-comparison`](https://docs.astral.sh/ruff/rules/true-false-comparison) (`E712`)
  - [`not-in-test`](https://docs.astral.sh/ruff/rules/not-in-test) (`E713`)
  - [`not-is-test`](https://docs.astral.sh/ruff/rules/not-is-test) (`E714`)
  - [`type-comparison`](https://docs.astral.sh/ruff/rules/type-comparison) (`E721`)
  - [`lambda-assignment`](https://docs.astral.sh/ruff/rules/lambda-assignment) (`E731`)
  - [`ambiguous-variable-name`](https://docs.astral.sh/ruff/rules/ambiguous-variable-name) (`E741`)
  - [`ambiguous-class-name`](https://docs.astral.sh/ruff/rules/ambiguous-class-name) (`E742`)
  - [`ambiguous-function-name`](https://docs.astral.sh/ruff/rules/ambiguous-function-name) (`E743`)
  - [`undefined-local-with-import-star`](https://docs.astral.sh/ruff/rules/undefined-local-with-import-star) (`F403`)
  - [`undefined-local-with-import-star-usage`](https://docs.astral.sh/ruff/rules/undefined-local-with-import-star-usage) (`F405`)
  - [`undefined-local-with-nested-import-star-usage`](https://docs.astral.sh/ruff/rules/undefined-local-with-nested-import-star-usage) (`F406`)
  - [`forward-annotation-syntax-error`](https://docs.astral.sh/ruff/rules/forward-annotation-syntax-error) (`F722`)

  If you use preview and prefer the old defaults, you can restore them with
  configuration like:

  ```toml

  # ruff.toml

  [lint]
  select = ["E4", "E7", "E9", "F"]

  # pyproject.toml

  [tool.ruff.lint]
  select = ["E4", "E7", "E9", "F"]
  ```

  If you do give them a try, feel free to share your feedback in the [GitHub
  discussion](astral-sh/ruff#23203)!

- \[`flake8-pyi`] Also check string annotations (`PYI041`) ([#19023](astral-sh/ruff#19023))

- \[`flake8-async`] Fix `in_async_context` logic ([#23426](astral-sh/ruff#23426))
- \[`ruff`] Fix for `RUF102` should delete entire comment ([#23380](astral-sh/ruff#23380))
- \[`ruff`] Suppress diagnostic for strings with backslashes in interpolations before Python 3.12 (`RUF027`) ([#21069](astral-sh/ruff#21069))
- \[`flake8-bugbear`] Fix `B023` false positive for immediately-invoked lambdas ([#23294](astral-sh/ruff#23294))
- \[parser] Fix false syntax error for match-like annotated assignments ([#23297](astral-sh/ruff#23297))
- \[parser] Fix indentation tracking after line continuations ([#23417](astral-sh/ruff#23417))

- \[`flake8-executable`] Allow global flags in uv shebangs (`EXE003`) ([#22582](astral-sh/ruff#22582))
- \[`pyupgrade`] Fix handling of `typing.{io,re}` (`UP035`) ([#23131](astral-sh/ruff#23131))
- \[`ruff`] Detect `PLC0207` on chained `str.split()` calls ([#23275](astral-sh/ruff#23275))

- Remove invalid inline `noqa` warning ([#23270](astral-sh/ruff#23270))

- Add extension mapping to configuration file options ([#23384](astral-sh/ruff#23384))

- Add `Q004` to the list of conflicting rules ([#23340](astral-sh/ruff#23340))
- \[`ruff`] Expand `lint.external` docs and add sub-diagnostic (`RUF100`, `RUF102`) ([#23268](astral-sh/ruff#23268))

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- [@Jkhall81](https://github.com/Jkhall81)
- [@danparizher](https://github.com/danparizher)
- [@dhruvmanila](https://github.com/dhruvmanila)
- [@harupy](https://github.com/harupy)
- [@ngnpope](https://github.com/ngnpope)
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- [@robsdedude](https://github.com/robsdedude)
- [@shaanmajid](https://github.com/shaanmajid)
- [@ntBre](https://github.com/ntBre)
- [@toslunar](https://github.com/toslunar)

Released on 2026-02-12.

- \[`airflow`] Add ruff rules to catch deprecated Airflow imports for Airflow 3.1 (`AIR321`) ([#22376](astral-sh/ruff#22376))
- \[`airflow`] Third positional parameter not named `ti_key` should be flagged for `BaseOperatorLink.get_link` (`AIR303`) ([#22828](astral-sh/ruff#22828))
- \[`flake8-gettext`] Fix false negatives for plural argument of `ngettext` (`INT001`, `INT002`, `INT003`) ([#21078](astral-sh/ruff#21078))
- \[`pyflakes`] Fix infinite loop in preview fix for `unused-import` (`F401`) ([#23038](astral-sh/ruff#23038))
- \[`pygrep-hooks`] Detect non-existent mock methods in standalone expressions (`PGH005`) ([#22830](astral-sh/ruff#22830))
- \[`pylint`] Allow dunder submodules and improve diagnostic range (`PLC2701`) ([#22804](astral-sh/ruff#22804))
- \[`pyupgrade`] Improve diagnostic range for tuples (`UP024`) ([#23013](astral-sh/ruff#23013))
- \[`refurb`] Check subscripts in tuple do not use lambda parameters in `reimplemented-operator` (`FURB118`) ([#23079](astral-sh/ruff#23079))
- \[`ruff`] Detect mutable defaults in `field` calls (`RUF008`) ([#23046](astral-sh/ruff#23046))
- \[`ruff`] Ignore std `cmath.inf` (`RUF069`) ([#23120](astral-sh/ruff#23120))
- \[`ruff`] New rule `float-equality-comparison` (`RUF069`) ([#20585](astral-sh/ruff#20585))
- Don't format unlabeled Markdown code blocks ([#23106](astral-sh/ruff#23106))
- Markdown formatting support in LSP ([#23063](astral-sh/ruff#23063))
- Support Quarto Markdown language markers ([#22947](astral-sh/ruff#22947))
- Support formatting `pycon` Markdown code blocks ([#23112](astral-sh/ruff#23112))
- Use extension mapping to select Markdown code block language ([#22934](astral-sh/ruff#22934))

- Avoid false positive for undefined variables in `FAST001` ([#23224](astral-sh/ruff#23224))
- Avoid introducing syntax errors for `FAST003` autofix ([#23227](astral-sh/ruff#23227))
- Avoid suggesting `InitVar` for `__post_init__` that references PEP 695 type parameters ([#23226](astral-sh/ruff#23226))
- Deduplicate type variables in generic functions ([#23225](astral-sh/ruff#23225))
- Fix exception handler parenthesis removal for Python 3.14+ ([#23126](astral-sh/ruff#23126))
- Fix f-string middle panic when parsing t-strings ([#23232](astral-sh/ruff#23232))
- Wrap `RUF020` target for multiline fixes ([#23210](astral-sh/ruff#23210))
- Wrap `UP007` target for multiline fixes ([#23208](astral-sh/ruff#23208))
- Fix missing diagnostics for last range suppression in file ([#23242](astral-sh/ruff#23242))
- \[`pyupgrade`] Fix syntax error on string with newline escape and comment (`UP037`) ([#22968](astral-sh/ruff#22968))

- Use `ruff` instead of `Ruff` as the program name in GitHub output format ([#23240](astral-sh/ruff#23240))
- \[`PT006`] Fix syntax error when unpacking nested tuples in `parametrize` fixes ([#22441](astral-sh/ruff#22441)) ([#22464](astral-sh/ruff#22464))
- \[`airflow`] Catch deprecated attribute access from context key for Airflow 3.0 (`AIR301`) ([#22850](astral-sh/ruff#22850))
- \[`airflow`] Capture deprecated arguments and a decorator (`AIR301`) ([#23170](astral-sh/ruff#23170))
- \[`flake8-boolean-trap`] Add `multiprocessing.Value` to excluded functions for `FBT003` ([#23010](astral-sh/ruff#23010))
- \[`flake8-bugbear`] Add a secondary annotation showing the previous occurrence (`B033`) ([#22634](astral-sh/ruff#22634))
- \[`flake8-type-checking`] Add sub-diagnostic showing the runtime use of an annotation (`TC004`) ([#23091](astral-sh/ruff#23091))
- \[`isort`] Support configurable import section heading comments ([#23151](astral-sh/ruff#23151))
- \[`ruff`] Improve the diagnostic for `RUF012` ([#23202](astral-sh/ruff#23202))

- Suppress diagnostic output for `format --check --silent` ([#17736](astral-sh/ruff#17736))

- Add tabbed shell completion documentation ([#23169](astral-sh/ruff#23169))
- Explain how to enable Markdown formatting for pre-commit hook ([#23077](astral-sh/ruff#23077))
- Fixed import in `runtime-evaluated-decorators` example ([#23187](astral-sh/ruff#23187))
- Update ruff server contributing guide ([#23060](astral-sh/ruff#23060))

- Exclude WASM artifacts from GitHub releases ([#23221](astral-sh/ruff#23221))

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Released on 2026-02-03.

Check out the [blog post](https://astral.sh/blog/ruff-v0.15.0) for a migration
guide and overview of the changes!

- Ruff now formats your code according to the 2026 style guide. See the formatter section below or in the blog post for a detailed list of changes.

- The linter now supports block suppression comments. For example, to suppress `N803` for all parameters in this function:

  ```python
  # ruff: disable[N803]
  def foo(
      legacyArg1,
      legacyArg2,
      legacyArg3,
      legacyArg4,
  ): ...
  # ruff: enable[N803]
  ```

  See the [documentation](https://docs.astral.sh/ruff/linter/#block-level) for more details.

- The `ruff:alpine` Docker image is now based on Alpine 3.23 (up from 3.21).

- The `ruff:debian` and `ruff:debian-slim` Docker images are now based on Debian 13 "Trixie" instead of Debian 12 "Bookworm."

- Binaries for the `ppc64` (64-bit big-endian PowerPC) architecture are no longer included in our releases. It should still be possible to build Ruff manually for this platform, if needed.

- Ruff now resolves all `extend`ed configuration files before falling back on a default Python version.

The following rules have been stabilized and are no longer in preview:

- [`blocking-http-call-httpx-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-http-call-httpx-in-async-function)
  (`ASYNC212`)
- [`blocking-path-method-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-path-method-in-async-function)
  (`ASYNC240`)
- [`blocking-input-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-input-in-async-function)
  (`ASYNC250`)
- [`map-without-explicit-strict`](https://docs.astral.sh/ruff/rules/map-without-explicit-strict)
  (`B912`)
- [`if-exp-instead-of-or-operator`](https://docs.astral.sh/ruff/rules/if-exp-instead-of-or-operator)
  (`FURB110`)
- [`single-item-membership-test`](https://docs.astral.sh/ruff/rules/single-item-membership-test)
  (`FURB171`)
- [`missing-maxsplit-arg`](https://docs.astral.sh/ruff/rules/missing-maxsplit-arg) (`PLC0207`)
- [`unnecessary-lambda`](https://docs.astral.sh/ruff/rules/unnecessary-lambda) (`PLW0108`)
- [`unnecessary-empty-iterable-within-deque-call`](https://docs.astral.sh/ruff/rules/unnecessary-empty-iterable-within-deque-call)
  (`RUF037`)
- [`in-empty-collection`](https://docs.astral.sh/ruff/rules/in-empty-collection) (`RUF060`)
- [`legacy-form-pytest-raises`](https://docs.astral.sh/ruff/rules/legacy-form-pytest-raises)
  (`RUF061`)
- [`non-octal-permissions`](https://docs.astral.sh/ruff/rules/non-octal-permissions) (`RUF064`)
- [`invalid-rule-code`](https://docs.astral.sh/ruff/rules/invalid-rule-code) (`RUF102`)
- [`invalid-suppression-comment`](https://docs.astral.sh/ruff/rules/invalid-suppression-comment)
  (`RUF103`)
- [`unmatched-suppression-comment`](https://docs.astral.sh/ruff/rules/unmatched-suppression-comment)
  (`RUF104`)
- [`replace-str-enum`](https://docs.astral.sh/ruff/rules/replace-str-enum) (`UP042`)

The following behaviors have been stabilized:

- The `--output-format` flag is now respected when running Ruff in `--watch` mode, and the `full` output format is now used by default, matching the regular CLI output.
- [`builtin-attribute-shadowing`](https://docs.astral.sh/ruff/rules/builtin-attribute-shadowing/) (`A003`) now detects the use of shadowed built-in names in additional contexts like decorators, default arguments, and other attribute definitions.
- [`duplicate-union-member`](https://docs.astral.sh/ruff/rules/duplicate-union-member/) (`PYI016`) now considers `typing.Optional` when searching for duplicate union members.
- [`split-static-string`](https://docs.astral.sh/ruff/rules/split-static-string/) (`SIM905`) now offers an autofix when the `maxsplit` argument is provided, even without a `sep` argument.
- [`dict-get-with-none-default`](https://docs.astral.sh/ruff/rules/dict-get-with-none-default/) (`SIM910`) now applies to more types of key expressions.
- [`super-call-with-parameters`](https://docs.astral.sh/ruff/rules/super-call-with-parameters/) (`UP008`) now has a safe fix when it will not delete comments.
- [`unnecessary-default-type-args`](https://docs.astral.sh/ruff/rules/unnecessary-default-type-args/) (`UP043`) now applies to stub (`.pyi`) files on Python versions before 3.13.

This release introduces the new 2026 style guide, with the following changes:

- Lambda parameters are now kept on the same line and lambda bodies will be parenthesized to let
  them break across multiple lines ([#21385](astral-sh/ruff#21385))
- Parentheses around tuples of exceptions in `except` clauses will now be removed on Python 3.14 and
  later ([#20768](astral-sh/ruff#20768))
- A single empty line is now permitted at the beginning of function bodies ([#21110](astral-sh/ruff#21110))
- Parentheses are avoided for long `as` captures in `match` statements ([#21176](astral-sh/ruff#21176))
- Extra spaces between escaped quotes and ending triple quotes can now be omitted ([#17216](astral-sh/ruff#17216))
- Blank lines are now enforced before classes with decorators in stub files ([#18888](astral-sh/ruff#18888))

- Apply formatting to Markdown code blocks ([#22470](astral-sh/ruff#22470), [#22990](astral-sh/ruff#22990), [#22996](astral-sh/ruff#22996))

  See the [documentation](https://docs.astral.sh/ruff/formatter/#markdown-code-formatting) for more details.

- Fix suppression indentation matching ([#22903](astral-sh/ruff#22903))

- Customize where the `fix_title` sub-diagnostic appears ([#23044](astral-sh/ruff#23044))
- \[`FastAPI`] Add sub-diagnostic explaining why a fix was unavailable (`FAST002`) ([#22565](astral-sh/ruff#22565))
- \[`flake8-annotations`] Don't suggest `NoReturn` for functions raising `NotImplementedError` (`ANN201`, `ANN202`, `ANN205`, `ANN206`) ([#21311](astral-sh/ruff#21311))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP017`) ([#22873](astral-sh/ruff#22873))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP020`) ([#22872](astral-sh/ruff#22872))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP033`) ([#22871](astral-sh/ruff#22871))
- \[`refurb`] Do not add `abc.ABC` if already present (`FURB180`) ([#22234](astral-sh/ruff#22234))
- \[`refurb`] Make fix unsafe if it deletes comments (`FURB110`) ([#22768](astral-sh/ruff#22768))
- \[`ruff`] Add sub-diagnostics with permissions (`RUF064`) ([#22972](astral-sh/ruff#22972))

- Identify notebooks by LSP `didOpen` instead of `.ipynb` file extension ([#22810](astral-sh/ruff#22810))

- Add `--color` CLI option to force colored output ([#22806](astral-sh/ruff#22806))

- Document `-` stdin convention in CLI help text ([#22817](astral-sh/ruff#22817))
- \[`refurb`] Change example to `re.search` with `^` anchor (`FURB167`) ([#22984](astral-sh/ruff#22984))
- Fix link to Sphinx code block directives ([#23041](astral-sh/ruff#23041))
- \[`pydocstyle`] Clarify which quote styles are allowed (`D300`) ([#22825](astral-sh/ruff#22825))
- \[`flake8-bugbear`] Improve docs for `no-explicit-stacklevel` (`B028`) ([#22538](astral-sh/ruff#22538))

- Update MSRV to 1.91 ([#22874](astral-sh/ruff#22874))

- [@danparizher](https://github.com/danparizher)
- [@chirizxc](https://github.com/chirizxc)
- [@amyreese](https://github.com/amyreese)
- [@Jkhall81](https://github.com/Jkhall81)
- [@cwkang1998](https://github.com/cwkang1998)
- [@manzt](https://github.com/manzt)
- [@11happy](https://github.com/11happy)
- [@hugovk](https://github.com/hugovk)
- [@caiquejjx](https://github.com/caiquejjx)
- [@ntBre](https://github.com/ntBre)
- [@akawd](https://github.com/akawd)
- [@konstin](https://github.com/konstin)

Renovate-Branch: renovate/2024.6-ruff-0.x
Change-Id: I8f8e865435fde1fc736fe2528261a604acb46215
Priv-Id: f7e1d99008e3617149c4b639a9a2bbc06212d064