[ty] Improve specialization-error diagnostics

This should fix the fuzz build on `main`. They added support for
t-strings, which made one of our matches non-exhaustive.

https://github.com/Instagram/LibCST/releases/tag/v1.8.4

.github/workflows/ci.yaml

@@ -259,6 +259,10 @@ jobs:
         uses: taiki-e/install-action@6064345e6658255e90e9500fdf9a06ab77e6909c # v2.57.6
         with:
           tool: cargo-insta
+      - name: "Install uv"
+        uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
+        with:
+          enable-cache: "true"
       - name: ty mdtests (GitHub annotations)
         if: ${{ needs.determine_changes.outputs.ty == 'true' }}
         env:
@@ -317,6 +321,10 @@ jobs:
         uses: taiki-e/install-action@6064345e6658255e90e9500fdf9a06ab77e6909c # v2.57.6
         with:
           tool: cargo-insta
+      - name: "Install uv"
+        uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
+        with:
+          enable-cache: "true"
       - name: "Run tests"
         shell: bash
         env:
@@ -340,6 +348,10 @@ jobs:
         uses: taiki-e/install-action@6064345e6658255e90e9500fdf9a06ab77e6909c # v2.57.6
         with:
           tool: cargo-nextest
+      - name: "Install uv"
+        uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
+        with:
+          enable-cache: "true"
       - name: "Run tests"
         shell: bash
         env:
@@ -441,9 +453,7 @@ jobs:
       - name: "Install Rust toolchain"
         run: rustup show
       - name: "Install cargo-binstall"
-        uses: cargo-bins/cargo-binstall@2bb61346d075e720d4c3da92f23b6d612d5a7543 # v1.15.3
-        with:
-          tool: cargo-fuzz@0.11.2
+        uses: cargo-bins/cargo-binstall@837578dfb436769f1e6669b2e23ffea9d9d2da8f # v1.15.4
       - name: "Install cargo-fuzz"
         # Download the latest version from quick install and not the github releases because github releases only has MUSL targets.
         run: cargo binstall cargo-fuzz --force  --disable-strategies crate-meta-data --no-confirm
@@ -463,7 +473,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         name: Download Ruff binary to test
         id: download-cached-binary
@@ -664,7 +674,7 @@ jobs:
           branch: ${{ github.event.pull_request.base.ref }}
           workflow: "ci.yaml"
           check_artifacts: true
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: Fuzz
         env:
           FORCE_COLOR: 1
@@ -694,7 +704,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: cargo-bins/cargo-binstall@2bb61346d075e720d4c3da92f23b6d612d5a7543 # v1.15.3
+      - uses: cargo-bins/cargo-binstall@837578dfb436769f1e6669b2e23ffea9d9d2da8f # v1.15.4
       - run: cargo binstall --no-confirm cargo-shear
       - run: cargo shear
 
@@ -734,7 +744,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
@@ -777,7 +787,7 @@ jobs:
       - name: "Install Rust toolchain"
         run: rustup show
       - name: Install uv
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: "Install Insiders dependencies"
         if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
         run: uv pip install -r docs/requirements-insiders.txt --system
@@ -909,7 +919,7 @@ jobs:
           persist-credentials: false
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - name: "Install Rust toolchain"
         run: rustup show
@@ -942,7 +952,7 @@ jobs:
           persist-credentials: false
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - name: "Install Rust toolchain"
         run: rustup show

.github/workflows/daily_fuzz.yaml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: "Install Rust toolchain"
         run: rustup show
       - name: "Install mold"

.github/workflows/mypy_primer.yaml

@@ -39,7 +39,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         with:
@@ -82,7 +82,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         with:

.github/workflows/publish-pypi.yml

@@ -22,7 +22,7 @@ jobs:
       id-token: write
     steps:
       - name: "Install uv"
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           pattern: wheels-*

.github/workflows/sync_typeshed.yaml

@@ -65,7 +65,7 @@ jobs:
         run: |
           git config --global user.name typeshedbot
           git config --global user.email '<>'
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: Sync typeshed stubs
         run: |
           rm -rf "ruff/${VENDORED_TYPESHED}"
@@ -117,7 +117,7 @@ jobs:
         with:
           persist-credentials: true
           ref: ${{ env.UPSTREAM_BRANCH}}
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: Setup git
         run: |
           git config --global user.name typeshedbot
@@ -155,7 +155,7 @@ jobs:
         with:
           persist-credentials: true
           ref: ${{ env.UPSTREAM_BRANCH}}
-      - uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+      - uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
       - name: Setup git
         run: |
           git config --global user.name typeshedbot

.github/workflows/ty-ecosystem-analyzer.yaml

@@ -33,7 +33,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         with:
@@ -64,11 +64,12 @@ jobs:
 
           cd ..
 
-          uv tool install "git+https://github.com/astral-sh/ecosystem-analyzer@27dd66d9e397d986ef9c631119ee09556eab8af9"
+          uv tool install "git+https://github.com/astral-sh/ecosystem-analyzer@1f560d07d672effae250e3d271da53d96c5260ff"
 
           ecosystem-analyzer \
             --repository ruff \
             diff \
+            --profile=release \
             --projects-old ruff/projects_old.txt \
             --projects-new ruff/projects_new.txt \
             --old old_commit \

.github/workflows/ty-ecosystem-report.yaml

@@ -29,7 +29,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
+        uses: astral-sh/setup-uv@557e51de59eb14aaaba2ed9621916900a91d50c6 # v6.6.1
 
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         with:

CHANGELOG.md

@@ -1,5 +1,33 @@
 # Changelog
 
+## 0.12.12
+
+### Preview features
+
+- Show fixes by default ([#19919](https://github.com/astral-sh/ruff/pull/19919))
+- \[`airflow`\] Convert `DatasetOrTimeSchedule(datasets=...)` to `AssetOrTimeSchedule(assets=...)` (`AIR311`) ([#20202](https://github.com/astral-sh/ruff/pull/20202))
+- \[`airflow`\] Improve the `AIR002` error message ([#20173](https://github.com/astral-sh/ruff/pull/20173))
+- \[`airflow`\] Move `airflow.operators.postgres_operator.Mapping` from `AIR302` to `AIR301` ([#20172](https://github.com/astral-sh/ruff/pull/20172))
+- \[`flake8-async`\] Implement `blocking-input` rule (`ASYNC250`) ([#20122](https://github.com/astral-sh/ruff/pull/20122))
+- \[`flake8-use-pathlib`\] Make `PTH119` and `PTH120` fixes unsafe because they can change behavior ([#20118](https://github.com/astral-sh/ruff/pull/20118))
+- \[`pylint`\] Add U+061C to `PLE2502` ([#20106](https://github.com/astral-sh/ruff/pull/20106))
+- \[`ruff`\] Fix false negative for empty f-strings in `deque` calls (`RUF037`) ([#20109](https://github.com/astral-sh/ruff/pull/20109))
+
+### Bug fixes
+
+- Less confidently mark f-strings as empty when inferring truthiness ([#20152](https://github.com/astral-sh/ruff/pull/20152))
+- \[`fastapi`\] Fix false positive for paths with spaces around parameters (`FAST003`) ([#20077](https://github.com/astral-sh/ruff/pull/20077))
+- \[`flake8-comprehensions`\] Skip `C417` when lambda contains `yield`/`yield from` ([#20201](https://github.com/astral-sh/ruff/pull/20201))
+- \[`perflint`\] Handle tuples in dictionary comprehensions (`PERF403`) ([#19934](https://github.com/astral-sh/ruff/pull/19934))
+
+### Rule changes
+
+- \[`pycodestyle`\] Preserve return type annotation for `ParamSpec` (`E731`) ([#20108](https://github.com/astral-sh/ruff/pull/20108))
+
+### Documentation
+
+- Add fix safety sections to docs ([#17490](https://github.com/astral-sh/ruff/pull/17490),[#17499](https://github.com/astral-sh/ruff/pull/17499))
+
 ## 0.12.11
 
 ### Preview features

Cargo.lock

@@ -257,9 +257,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bitflags"
-version = "2.9.3"
+version = "2.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34efbcccd345379ca2868b2b2c9d3782e9cc58ba87bc7d79d5b53d9c9ae6f25d"
+checksum = "2261d10cca569e4643e526d8dc2e62e433cc8aba21ab764233731f8d369bf394"
 
 [[package]]
 name = "bitvec"
@@ -295,7 +295,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "234113d19d0d7d613b40e86fb654acf958910802bcceab913a4f9e7cda03b1a4"
 dependencies = [
  "memchr",
- "regex-automata 0.4.10",
+ "regex-automata",
  "serde",
 ]
 
@@ -408,9 +408,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.46"
+version = "4.5.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c5e4fcf9c21d2e544ca1ee9d8552de13019a42aa7dbf32747fa7aaf1df76e57"
+checksum = "7eac00902d9d136acd712710d71823fb8ac8004ca445a89e73a41d45aa712931"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -418,9 +418,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.46"
+version = "4.5.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fecb53a0e6fcfb055f686001bc2e2592fa527efaf38dbe81a6a9563562e57d41"
+checksum = "2ad9bbf750e73b5884fb8a211a9424a1906c1e156724260fdae972f31d70e1d6"
 dependencies = [
  "anstream",
  "anstyle",
@@ -461,9 +461,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.45"
+version = "4.5.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14cb31bb0a7d536caef2639baa7fad459e15c3144efefa6dbd1c84562c4739f6"
+checksum = "bbfd7eae0b0f1a6e63d4b13c9c478de77c2eb546fba158ad50b4203dc24b9f9c"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -603,7 +603,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "117725a109d387c937a1533ce01b450cbde6b88abceea8473c4d7a85853cda3c"
 dependencies = [
  "lazy_static",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -612,7 +612,7 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fde0e0ec90c9dfb3b4b1a0891a7dcd0e2bffde2f7efed5fe7c9bb00e5bfb915e"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1035,7 +1035,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "778e2ac28f6c47af28e4907f13ffd1e1ddbd400980a9abd7c8df189bf578a5ad"
 dependencies = [
  "libc",
- "windows-sys 0.60.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1231,8 +1231,8 @@ dependencies = [
  "aho-corasick",
  "bstr",
  "log",
- "regex-automata 0.4.10",
- "regex-syntax 0.8.5",
+ "regex-automata",
+ "regex-syntax",
 ]
 
 [[package]]
@@ -1241,7 +1241,7 @@ version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0bf760ebf69878d9fd8f110c89703d90ce35095324d1f1edcb595c63945ee757"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "ignore",
  "walkdir",
 ]
@@ -1459,7 +1459,7 @@ dependencies = [
  "globset",
  "log",
  "memchr",
- "regex-automata 0.4.10",
+ "regex-automata",
  "same-file",
  "walkdir",
  "winapi-util",
@@ -1521,7 +1521,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f37dccff2791ab604f9babef0ba14fbe0be30bd368dc541e2b08d07c8aa908f3"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "inotify-sys",
  "libc",
 ]
@@ -1537,9 +1537,9 @@ dependencies = [
 
 [[package]]
 name = "insta"
-version = "1.43.1"
+version = "1.43.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "154934ea70c58054b556dd430b99a98c2a7ff5309ac9891597e339b5c28f4371"
+checksum = "46fdb647ebde000f43b5b53f773c30cf9b0cb4300453208713fa38b2c70935a0"
 dependencies = [
  "console 0.15.11",
  "globset",
@@ -1617,7 +1617,7 @@ checksum = "e04d7f318608d35d4b61ddd75cbdaee86b023ebe2bd5a66ee0915f0bf93095a9"
 dependencies = [
  "hermit-abi",
  "libc",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1681,7 +1681,7 @@ dependencies = [
  "portable-atomic",
  "portable-atomic-util",
  "serde",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1728,9 +1728,9 @@ checksum = "a037eddb7d28de1d0fc42411f501b53b75838d313908078d6698d064f3029b24"
 
 [[package]]
 name = "js-sys"
-version = "0.3.77"
+version = "0.3.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1cfaf33c695fc6e08064efbc1f72ec937429614f25eef83af942d0e227c3a28f"
+checksum = "0c0b063578492ceec17683ef2f8c5e89121fbd0b172cbc280635ab7567db2738"
 dependencies = [
  "once_cell",
  "wasm-bindgen",
@@ -1770,9 +1770,9 @@ checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 
 [[package]]
 name = "libcst"
-version = "1.8.2"
+version = "1.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae28ddc5b90c3e3146a21d051ca095cbc8d932ad8714cf65ddf71a9abb35684c"
+checksum = "052ef5d9fc958a51aeebdf3713573b36c6fd6eed0bf0e60e204d2c0f8cf19b9f"
 dependencies = [
  "annotate-snippets",
  "libcst_derive",
@@ -1785,9 +1785,9 @@ dependencies = [
 
 [[package]]
 name = "libcst_derive"
-version = "1.8.2"
+version = "1.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc2de5c2f62bcf8a4f7290b1854388b262c4b68f1db1a3ee3ef6d4c1319b00a3"
+checksum = "a91a751afee92cbdd59d4bc6754c7672712eec2d30a308f23de4e3287b2929cb"
 dependencies = [
  "quote",
  "syn",
@@ -1809,7 +1809,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "391290121bad3d37fbddad76d8f5d1c1c314cfc646d143d7e07a3086ddff0ce3"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "libc",
  "redox_syscall",
 ]
@@ -1850,9 +1850,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.27"
+version = "0.4.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
+checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
 
 [[package]]
 name = "lsp-server"
@@ -1913,11 +1913,11 @@ dependencies = [
 
 [[package]]
 name = "matchers"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+checksum = "d1525a2a28c7f4fa0fc98bb91ae755d1e2d1505079e05539e35bc876b5d65ae9"
 dependencies = [
- "regex-automata 0.1.10",
+ "regex-automata",
 ]
 
 [[package]]
@@ -2014,7 +2014,7 @@ version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "71e2746dc3a24dd78b3cfcb7be93368c6de9963d30f43a6a73998a9cf4b17b46"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "cfg-if",
  "cfg_aliases",
  "libc",
@@ -2026,7 +2026,7 @@ version = "0.30.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "cfg-if",
  "cfg_aliases",
  "libc",
@@ -2054,7 +2054,7 @@ version = "8.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d3d07927151ff8575b7087f245456e549fea62edf0ec4e565a5ee50c8402bc3"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "fsevent-sys",
  "inotify",
  "kqueue",
@@ -2074,12 +2074,11 @@ checksum = "5e0826a989adedc2a244799e823aece04662b66609d96af8dff7ac6df9a8925d"
 
 [[package]]
 name = "nu-ansi-term"
-version = "0.46.0"
+version = "0.50.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77a8165726e8236064dbb45459242600304b42a5ea24ee2948e18e023bf7ba84"
+checksum = "d4a28e057d01f97e61255210fcff094d74ed0466038633e95017f5beb68e4399"
 dependencies = [
- "overload",
- "winapi",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2154,12 +2153,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "overload"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
-
 [[package]]
 name = "parking_lot"
 version = "0.12.4"
@@ -2666,7 +2659,7 @@ version = "0.5.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5407465600fb0548f1442edf71dd20683c6ed326200ace4b1ef0763521bb3b77"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
 ]
 
 [[package]]
@@ -2688,17 +2681,8 @@ checksum = "23d7fd106d8c02486a8d64e778353d1cffe08ce79ac2e82f540c86d0facf6912"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata 0.4.10",
- "regex-syntax 0.8.5",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
-dependencies = [
- "regex-syntax 0.6.29",
+ "regex-automata",
+ "regex-syntax",
 ]
 
 [[package]]
@@ -2709,7 +2693,7 @@ checksum = "6b9458fa0bfeeac22b5ca447c63aaf45f28439a709ccd244698632f9aa6394d6"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax 0.8.5",
+ "regex-syntax",
 ]
 
 [[package]]
@@ -2718,12 +2702,6 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53a49587ad06b26609c52e423de037e7f57f20d53535d66e08c695f347df952a"
 
-[[package]]
-name = "regex-syntax"
-version = "0.6.29"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
-
 [[package]]
 name = "regex-syntax"
 version = "0.8.5"
@@ -2743,13 +2721,13 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.12.11"
+version = "0.12.12"
 dependencies = [
  "anyhow",
  "argfile",
  "assert_fs",
  "bincode 2.0.1",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "cachedir",
  "clap",
  "clap_complete_command",
@@ -2999,11 +2977,11 @@ dependencies = [
 
 [[package]]
 name = "ruff_linter"
-version = "0.12.11"
+version = "0.12.12"
 dependencies = [
  "aho-corasick",
  "anyhow",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "clap",
  "colored 3.0.0",
  "fern",
@@ -3108,7 +3086,7 @@ name = "ruff_python_ast"
 version = "0.0.0"
 dependencies = [
  "aho-corasick",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "compact_str",
  "get-size2",
  "is-macro",
@@ -3196,7 +3174,7 @@ dependencies = [
 name = "ruff_python_literal"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "itertools 0.14.0",
  "ruff_python_ast",
  "unic-ucd-category",
@@ -3207,7 +3185,7 @@ name = "ruff_python_parser"
 version = "0.0.0"
 dependencies = [
  "anyhow",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "bstr",
  "compact_str",
  "get-size2",
@@ -3232,7 +3210,7 @@ dependencies = [
 name = "ruff_python_semantic"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "insta",
  "is-macro",
  "ruff_cache",
@@ -3253,7 +3231,7 @@ dependencies = [
 name = "ruff_python_stdlib"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "unicode-ident",
 ]
 
@@ -3337,7 +3315,7 @@ dependencies = [
 
 [[package]]
 name = "ruff_wasm"
-version = "0.12.11"
+version = "0.12.12"
 dependencies = [
  "console_error_panic_hook",
  "console_log",
@@ -3430,11 +3408,11 @@ version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "11181fbabf243db407ef8df94a6ce0b2f9a733bd8be4ad02b4eda9602296cac8"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.60.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -3827,7 +3805,7 @@ dependencies = [
  "getrandom 0.3.3",
  "once_cell",
  "rustix",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -4161,15 +4139,15 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.19"
+version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8189decb5ac0fa7bc8b96b7cb9b2701d60d48805aca84a238004d665fcc4008"
+checksum = "2054a14f5307d601f88daf0553e1cbf472acc4f2c51afab632431cdcd72124d5"
 dependencies = [
  "chrono",
  "matchers",
  "nu-ansi-term",
  "once_cell",
- "regex",
+ "regex-automata",
  "sharded-slab",
  "smallvec",
  "thread_local",
@@ -4240,7 +4218,8 @@ dependencies = [
 name = "ty_ide"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
+ "camino",
  "get-size2",
  "insta",
  "itertools 0.14.0",
@@ -4278,7 +4257,7 @@ dependencies = [
  "pep440_rs",
  "rayon",
  "regex",
- "regex-automata 0.4.10",
+ "regex-automata",
  "ruff_cache",
  "ruff_db",
  "ruff_macros",
@@ -4304,7 +4283,7 @@ name = "ty_python_semantic"
 version = "0.0.0"
 dependencies = [
  "anyhow",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "bitvec",
  "camino",
  "colored 3.0.0",
@@ -4357,7 +4336,7 @@ name = "ty_server"
 version = "0.0.0"
 dependencies = [
  "anyhow",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "crossbeam",
  "dunce",
  "insta",
@@ -4400,7 +4379,7 @@ name = "ty_test"
 version = "0.0.0"
 dependencies = [
  "anyhow",
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
  "camino",
  "colored 3.0.0",
  "insta",
@@ -4759,21 +4738,22 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.100"
+version = "0.2.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1edc8929d7499fc4e8f0be2262a241556cfc54a0bea223790e71446f2aab1ef5"
+checksum = "7e14915cadd45b529bb8d1f343c4ed0ac1de926144b746e2710f9cd05df6603b"
 dependencies = [
  "cfg-if",
  "once_cell",
  "rustversion",
  "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.100"
+version = "0.2.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f0a0651a5c2bc21487bde11ee802ccaf4c51935d0d3d42a6101f98161700bc6"
+checksum = "e28d1ba982ca7923fd01448d5c30c6864d0a14109560296a162f80f305fb93bb"
 dependencies = [
  "bumpalo",
  "log",
@@ -4785,9 +4765,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.50"
+version = "0.4.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "555d470ec0bc3bb57890405e5d4322cc9ea83cebb085523ced7be4144dac1e61"
+checksum = "0ca85039a9b469b38336411d6d6ced91f3fc87109a2a27b0c197663f5144dffe"
 dependencies = [
  "cfg-if",
  "js-sys",
@@ -4798,9 +4778,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.100"
+version = "0.2.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe63fc6d09ed3792bd0897b314f53de8e16568c2b3f7982f468c0bf9bd0b407"
+checksum = "7c3d463ae3eff775b0c45df9da45d68837702ac35af998361e2c84e7c5ec1b0d"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -4808,9 +4788,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.100"
+version = "0.2.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
+checksum = "7bb4ce89b08211f923caf51d527662b75bdc9c9c7aab40f86dcb9fb85ac552aa"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -4821,18 +4801,18 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.100"
+version = "0.2.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a05d73b933a847d6cccdda8f838a22ff101ad9bf93e33684f39c1f5f0eece3d"
+checksum = "f143854a3b13752c6950862c906306adb27c7e839f7414cec8fea35beab624c1"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "wasm-bindgen-test"
-version = "0.3.50"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "66c8d5e33ca3b6d9fa3b4676d774c5778031d27a578c2b007f905acf816152c3"
+checksum = "80cc7f8a4114fdaa0c58383caf973fc126cf004eba25c9dc639bccd3880d55ad"
 dependencies = [
  "js-sys",
  "minicov",
@@ -4843,9 +4823,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-test-macro"
-version = "0.3.50"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17d5042cc5fa009658f9a7333ef24291b1291a25b6382dd68862a7f3b969f69b"
+checksum = "c5ada2ab788d46d4bda04c9d567702a79c8ced14f51f221646a16ed39d0e6a5d"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -4854,9 +4834,9 @@ dependencies = [
 
 [[package]]
 name = "web-sys"
-version = "0.3.77"
+version = "0.3.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33b6dd2ef9186f1f2072e409e99cd22a975331a6b3591b12c764e0e55c60d5d2"
+checksum = "77e4b637749ff0d92b8fad63aa1f7cff3cbe125fd49c175cd6345e7272638b12"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -4892,37 +4872,15 @@ dependencies = [
  "glob",
 ]
 
-[[package]]
-name = "winapi"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-
 [[package]]
 name = "winapi-util"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-
 [[package]]
 name = "windows-core"
 version = "0.61.2"
@@ -4982,6 +4940,15 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
@@ -5150,7 +5117,7 @@ version = "0.39.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
 dependencies = [
- "bitflags 2.9.3",
+ "bitflags 2.9.4",
 ]
 
 [[package]]

Cargo.toml

@@ -115,7 +115,7 @@ jiff = { version = "0.2.0" }
 js-sys = { version = "0.3.69" }
 jod-thread = { version = "1.0.0" }
 libc = { version = "0.2.153" }
-libcst = { version = "1.1.0", default-features = false }
+libcst = { version = "1.8.4", default-features = false }
 log = { version = "0.4.17" }
 lsp-server = { version = "0.7.6" }
 lsp-types = { git = "https://github.com/astral-sh/lsp-types.git", rev = "3512a9f", features = [
@@ -251,6 +251,14 @@ rest_pat_in_fully_bound_structs = "warn"
 redundant_clone = "warn"
 debug_assert_with_mut_call = "warn"
 unused_peekable = "warn"
+# This lint sometimes flags code whose `if` and `else`
+# bodies could be flipped when a `!` operator is removed.
+# While perhaps sometimes a good idea, it is also often
+# not a good idea due to other factors impacting
+# readability. For example, if flipping the bodies results
+# in the `if` being an order of magnitude bigger than the
+# `else`, then some might consider that harder to read.
+if_not_else = "allow"
 
 # Diagnostics are not actionable: Enable once https://github.com/rust-lang/rust-clippy/issues/13774 is resolved.
 large_stack_arrays = "allow"

README.md

@@ -148,8 +148,8 @@ curl -LsSf https://astral.sh/ruff/install.sh | sh
 powershell -c "irm https://astral.sh/ruff/install.ps1 | iex"
 
 # For a specific version.
-curl -LsSf https://astral.sh/ruff/0.12.11/install.sh | sh
-powershell -c "irm https://astral.sh/ruff/0.12.11/install.ps1 | iex"
+curl -LsSf https://astral.sh/ruff/0.12.12/install.sh | sh
+powershell -c "irm https://astral.sh/ruff/0.12.12/install.ps1 | iex"
 ```
 
 You can also install Ruff via [Homebrew](https://formulae.brew.sh/formula/ruff), [Conda](https://anaconda.org/conda-forge/ruff),
@@ -182,7 +182,7 @@ Ruff can also be used as a [pre-commit](https://pre-commit.com/) hook via [`ruff
 ```yaml
 - repo: https://github.com/astral-sh/ruff-pre-commit
   # Ruff version.
-  rev: v0.12.11
+  rev: v0.12.12
   hooks:
     # Run the linter.
     - id: ruff-check

crates/ruff/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.12.11"
+version = "0.12.12"
 publish = true
 authors = { workspace = true }
 edition = { workspace = true }

crates/ruff_benchmark/benches/ty_walltime.rs

@@ -232,7 +232,7 @@ static STATIC_FRAME: std::sync::LazyLock<Benchmark<'static>> = std::sync::LazyLo
             max_dep_date: "2025-08-09",
             python_version: PythonVersion::PY311,
         },
-        500,
+        600,
     )
 });
 

crates/ruff_db/src/diagnostic/mod.rs

@@ -454,24 +454,26 @@ impl Diagnostic {
 
     /// Computes the start source location for the message.
     ///
-    /// Panics if the diagnostic has no primary span, if its file is not a `SourceFile`, or if the
-    /// span has no range.
-    pub fn expect_ruff_start_location(&self) -> LineColumn {
-        self.expect_primary_span()
-            .expect_ruff_file()
-            .to_source_code()
-            .line_column(self.expect_range().start())
+    /// Returns None if the diagnostic has no primary span, if its file is not a `SourceFile`,
+    /// or if the span has no range.
+    pub fn ruff_start_location(&self) -> Option<LineColumn> {
+        Some(
+            self.ruff_source_file()?
+                .to_source_code()
+                .line_column(self.range()?.start()),
+        )
     }
 
     /// Computes the end source location for the message.
     ///
-    /// Panics if the diagnostic has no primary span, if its file is not a `SourceFile`, or if the
-    /// span has no range.
-    pub fn expect_ruff_end_location(&self) -> LineColumn {
-        self.expect_primary_span()
-            .expect_ruff_file()
-            .to_source_code()
-            .line_column(self.expect_range().end())
+    /// Returns None if the diagnostic has no primary span, if its file is not a `SourceFile`,
+    /// or if the span has no range.
+    pub fn ruff_end_location(&self) -> Option<LineColumn> {
+        Some(
+            self.ruff_source_file()?
+                .to_source_code()
+                .line_column(self.range()?.end()),
+        )
     }
 
     /// Returns the [`SourceFile`] which the message belongs to.
@@ -501,13 +503,18 @@ impl Diagnostic {
 
     /// Returns the ordering of diagnostics based on the start of their ranges, if they have any.
     ///
-    /// Panics if either diagnostic has no primary span, if the span has no range, or if its file is
-    /// not a `SourceFile`.
+    /// Panics if either diagnostic has no primary span, or if its file is not a `SourceFile`.
     pub fn ruff_start_ordering(&self, other: &Self) -> std::cmp::Ordering {
-        (self.expect_ruff_source_file(), self.expect_range().start()).cmp(&(
+        let a = (
+            self.expect_ruff_source_file(),
+            self.range().map(|r| r.start()),
+        );
+        let b = (
             other.expect_ruff_source_file(),
-            other.expect_range().start(),
-        ))
+            other.range().map(|r| r.start()),
+        );
+
+        a.cmp(&b)
     }
 }
 
@@ -1444,7 +1451,7 @@ pub enum DiagnosticFormat {
     Junit,
     /// Print diagnostics in the JSON format used by GitLab [Code Quality] reports.
     ///
-    /// [Code Quality]: https://docs.gitlab.com/ee/ci/testing/code_quality.html#implement-a-custom-tool
+    /// [Code Quality]: https://docs.gitlab.com/ci/testing/code_quality/#code-quality-report-format
     #[cfg(feature = "serde")]
     Gitlab,
 }

crates/ruff_formatter/src/lib.rs

@@ -81,14 +81,19 @@ impl IndentStyle {
     pub const fn is_space(&self) -> bool {
         matches!(self, IndentStyle::Space)
     }
+
+    /// Returns the string representation of the indent style.
+    pub const fn as_str(&self) -> &'static str {
+        match self {
+            IndentStyle::Tab => "tab",
+            IndentStyle::Space => "space",
+        }
+    }
 }
 
 impl std::fmt::Display for IndentStyle {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            IndentStyle::Tab => std::write!(f, "tab"),
-            IndentStyle::Space => std::write!(f, "space"),
-        }
+        f.write_str(self.as_str())
     }
 }
 

crates/ruff_formatter/src/printer/printer_options/mod.rs

@@ -139,4 +139,16 @@ impl LineEnding {
             LineEnding::CarriageReturn => "\r",
         }
     }
+
+    /// Returns the string used to configure this line ending.
+    ///
+    /// See [`LineEnding::as_str`] for the actual string representation of the line ending.
+    #[inline]
+    pub const fn as_setting_str(&self) -> &'static str {
+        match self {
+            LineEnding::LineFeed => "lf",
+            LineEnding::CarriageReturnLineFeed => "crlf",
+            LineEnding::CarriageReturn => "cr",
+        }
+    }
 }

crates/ruff_linter/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff_linter"
-version = "0.12.11"
+version = "0.12.12"
 publish = false
 authors = { workspace = true }
 edition = { workspace = true }

crates/ruff_linter/resources/test/fixtures/airflow/AIR301_names.py

@@ -12,6 +12,7 @@ from airflow import (
 from airflow.api_connexion.security import requires_access
 from airflow.contrib.aws_athena_hook import AWSAthenaHook
 from airflow.datasets import DatasetAliasEvent
+from airflow.operators.postgres_operator import Mapping
 from airflow.operators.subdag import SubDagOperator
 from airflow.secrets.cache import SecretCache
 from airflow.secrets.local_filesystem import LocalFilesystemBackend
@@ -52,6 +53,8 @@ DatasetAliasEvent()
 # airflow.operators.subdag.*
 SubDagOperator()
 
+# airflow.operators.postgres_operator
+Mapping()
 
 # airflow.secrets
 # get_connection

crates/ruff_linter/resources/test/fixtures/airflow/AIR311_names.py

@@ -70,7 +70,7 @@ from airflow.timetables.datasets import DatasetOrTimeSchedule
 from airflow.utils.dag_parsing_context import get_parsing_context
 
 # airflow.timetables.datasets
-DatasetOrTimeSchedule()
+DatasetOrTimeSchedule(datasets=[])
 
 # airflow.utils.dag_parsing_context
 get_parsing_context()

crates/ruff_linter/resources/test/fixtures/flake8_comprehensions/C417.py

@@ -75,3 +75,7 @@ list(map(lambda x, y: x, [(1, 2), (3, 4)]))
 _ = t"{set(map(lambda x: x % 2 == 0, nums))}"
 _ = t"{dict(map(lambda v: (v, v**2), nums))}"
 
+
+# See https://github.com/astral-sh/ruff/issues/20198
+# No error: lambda contains `yield`, so map() should not be rewritten
+map(lambda x: (yield x), [1, 2, 3])

crates/ruff_linter/resources/test/fixtures/pyupgrade/UP008.py

@@ -141,3 +141,133 @@ class ExampleWithKeywords:
     
     def method3(self):
         super(ExampleWithKeywords, self).some_method()  # Should be fixed - no keywords
+
+# See: https://github.com/astral-sh/ruff/issues/19357
+# Must be detected
+class ParentD:
+    def f(self):
+        print("D")
+
+class ChildD1(ParentD):
+    def f(self):
+        if False: __class__ # Python injects __class__ into scope
+        builtins.super(ChildD1, self).f()
+
+class ChildD2(ParentD):
+    def f(self):
+        if False: super # Python injects __class__ into scope
+        builtins.super(ChildD2, self).f()
+
+class ChildD3(ParentD):
+    def f(self):
+        builtins.super(ChildD3, self).f()
+        super # Python injects __class__ into scope
+
+import builtins as builtins_alias
+class ChildD4(ParentD):
+    def f(self):
+        builtins_alias.super(ChildD4, self).f()
+        super # Python injects __class__ into scope
+
+class ChildD5(ParentD):
+    def f(self):
+        super = 1
+        super # Python injects __class__ into scope
+        builtins.super(ChildD5, self).f()
+
+class ChildD6(ParentD):
+    def f(self):
+        super: "Any"
+        __class__ # Python injects __class__ into scope
+        builtins.super(ChildD6, self).f()
+
+class ChildD7(ParentD):
+    def f(self):
+        def x():
+            __class__ # Python injects __class__ into scope
+        builtins.super(ChildD7, self).f()
+
+class ChildD8(ParentD):
+    def f(self):
+        def x():
+            super = 1
+        super # Python injects __class__ into scope
+        builtins.super(ChildD8, self).f()
+
+class ChildD9(ParentD):
+    def f(self):
+        def x():
+            __class__ = 1
+        __class__ # Python injects __class__ into scope
+        builtins.super(ChildD9, self).f()
+
+class ChildD10(ParentD):
+    def f(self):
+        def x():
+            __class__ = 1
+        super # Python injects __class__ into scope
+        builtins.super(ChildD10, self).f()
+
+
+# Must be ignored
+class ParentI:
+    def f(self):
+        print("I")
+
+class ChildI1(ParentI):
+    def f(self):
+        builtins.super(ChildI1, self).f() # no __class__ in the local scope
+
+
+class ChildI2(ParentI):
+    def b(self):
+        x = __class__
+        if False: super
+
+    def f(self):
+        self.b()
+        builtins.super(ChildI2, self).f() # no __class__ in the local scope
+
+class ChildI3(ParentI):
+    def f(self):
+        if False: super
+        def x(_):
+            builtins.super(ChildI3, self).f() # no __class__ in the local scope
+        x(None)
+
+class ChildI4(ParentI):
+    def f(self):
+        super: "str"
+        builtins.super(ChildI4, self).f() # no __class__ in the local scope
+
+class ChildI5(ParentI):
+    def f(self):
+        super = 1
+        __class__ = 3
+        builtins.super(ChildI5, self).f() # no __class__ in the local scope
+
+class ChildI6(ParentI):
+    def f(self):
+        __class__ = None
+        __class__
+        builtins.super(ChildI6, self).f() # no __class__ in the local scope
+
+class ChildI7(ParentI):
+    def f(self):
+        __class__ = None
+        super
+        builtins.super(ChildI7, self).f()
+
+class ChildI8(ParentI):
+    def f(self):
+        __class__: "Any"
+        super
+        builtins.super(ChildI8, self).f()
+
+class ChildI9(ParentI):
+    def f(self):
+        class A:
+            def foo(self):
+                if False: super
+                if False: __class__
+        builtins.super(ChildI9, self).f()

crates/ruff_linter/resources/test/fixtures/pyupgrade/UP043.pyi

@@ -0,0 +1,59 @@
+from collections.abc import Generator, AsyncGenerator
+
+
+def func() -> Generator[int, None, None]:
+    yield 42
+
+
+def func() -> Generator[int, None]:
+    yield 42
+
+
+def func() -> Generator[int]:
+    yield 42
+
+
+def func() -> Generator[int, int, int]:
+    foo = yield 42
+    return foo
+
+
+def func() -> Generator[int, int, None]:
+    _ = yield 42
+    return None
+
+
+def func() -> Generator[int, None, int]:
+    yield 42
+    return 42
+
+
+async def func() -> AsyncGenerator[int, None]:
+    yield 42
+
+
+async def func() -> AsyncGenerator[int]:
+    yield 42
+
+
+async def func() -> AsyncGenerator[int, int]:
+    foo = yield 42
+    return foo
+
+
+from typing import Generator, AsyncGenerator
+
+
+def func() -> Generator[str, None, None]:
+    yield "hello"
+
+
+async def func() -> AsyncGenerator[str, None]:
+    yield "hello"
+
+
+async def func() -> AsyncGenerator[  # type: ignore
+    str,
+    None
+]:
+    yield "hello"

crates/ruff_linter/resources/test/fixtures/ruff/RUF060.py

@@ -42,3 +42,7 @@ b"a" in bytes("a", "utf-8")
 1 in set(set([1]))
 '' in {""}
 frozenset() in {frozenset()}
+
+# https://github.com/astral-sh/ruff/issues/20238
+"b" in f"" "" # Error
+"b" in f"" "x" # OK

crates/ruff_linter/resources/test/fixtures/syntax_errors/yield_from_in_async_function.py

@@ -0,0 +1 @@
+async def f(): yield from x # error

crates/ruff_linter/src/checkers/ast/analyze/expression.rs

@@ -9,6 +9,7 @@ use ruff_text_size::Ranged;
 use crate::checkers::ast::Checker;
 use crate::preview::{
     is_assert_raises_exception_call_enabled, is_optional_as_none_in_union_enabled,
+    is_unnecessary_default_type_args_stubs_enabled,
 };
 use crate::registry::Rule;
 use crate::rules::{
@@ -142,7 +143,10 @@ pub(crate) fn expression(expr: &Expr, checker: &Checker) {
             }
 
             if checker.is_rule_enabled(Rule::UnnecessaryDefaultTypeArgs) {
-                if checker.target_version() >= PythonVersion::PY313 {
+                if checker.target_version() >= PythonVersion::PY313
+                    || is_unnecessary_default_type_args_stubs_enabled(checker.settings())
+                        && checker.semantic().in_stub_file()
+                {
                     pyupgrade::rules::unnecessary_default_type_args(checker, expr);
                 }
             }
@@ -1319,13 +1323,10 @@ pub(crate) fn expression(expr: &Expr, checker: &Checker) {
                 pylint::rules::yield_in_init(checker, expr);
             }
         }
-        Expr::YieldFrom(yield_from) => {
+        Expr::YieldFrom(_) => {
             if checker.is_rule_enabled(Rule::YieldInInit) {
                 pylint::rules::yield_in_init(checker, expr);
             }
-            if checker.is_rule_enabled(Rule::YieldFromInAsyncFunction) {
-                pylint::rules::yield_from_in_async_function(checker, yield_from);
-            }
         }
         Expr::FString(f_string_expr @ ast::ExprFString { value, .. }) => {
             if checker.is_rule_enabled(Rule::FStringMissingPlaceholders) {

crates/ruff_linter/src/checkers/ast/mod.rs

@@ -71,7 +71,9 @@ use crate::registry::Rule;
 use crate::rules::pyflakes::rules::{
     LateFutureImport, ReturnOutsideFunction, YieldOutsideFunction,
 };
-use crate::rules::pylint::rules::{AwaitOutsideAsync, LoadBeforeGlobalDeclaration};
+use crate::rules::pylint::rules::{
+    AwaitOutsideAsync, LoadBeforeGlobalDeclaration, YieldFromInAsyncFunction,
+};
 use crate::rules::{flake8_pyi, flake8_type_checking, pyflakes, pyupgrade};
 use crate::settings::rule_table::RuleTable;
 use crate::settings::{LinterSettings, TargetVersion, flags};
@@ -668,6 +670,12 @@ impl SemanticSyntaxContext for Checker<'_> {
                     self.report_diagnostic(AwaitOutsideAsync, error.range);
                 }
             }
+            SemanticSyntaxErrorKind::YieldFromInAsyncFunction => {
+                // PLE1700
+                if self.is_rule_enabled(Rule::YieldFromInAsyncFunction) {
+                    self.report_diagnostic(YieldFromInAsyncFunction, error.range);
+                }
+            }
             SemanticSyntaxErrorKind::ReboundComprehensionVariable
             | SemanticSyntaxErrorKind::DuplicateTypeParameter
             | SemanticSyntaxErrorKind::MultipleCaseAssignment(_)

crates/ruff_linter/src/linter.rs

@@ -1231,6 +1231,10 @@ mod tests {
     )]
     #[test_case(Rule::AwaitOutsideAsync, Path::new("await_outside_async_function.py"))]
     #[test_case(Rule::AwaitOutsideAsync, Path::new("async_comprehension.py"))]
+    #[test_case(
+        Rule::YieldFromInAsyncFunction,
+        Path::new("yield_from_in_async_function.py")
+    )]
     fn test_syntax_errors(rule: Rule, path: &Path) -> Result<()> {
         let snapshot = path.to_string_lossy().to_string();
         let path = Path::new("resources/test/fixtures/syntax_errors").join(path);

crates/ruff_linter/src/message/github.rs

@@ -19,7 +19,7 @@ impl Emitter for GithubEmitter {
         context: &EmitterContext,
     ) -> anyhow::Result<()> {
         for diagnostic in diagnostics {
-            let source_location = diagnostic.expect_ruff_start_location();
+            let source_location = diagnostic.ruff_start_location().unwrap_or_default();
             let filename = diagnostic.expect_ruff_filename();
             let location = if context.is_notebook(&filename) {
                 // We can't give a reasonable location for the structured formats,
@@ -29,7 +29,7 @@ impl Emitter for GithubEmitter {
                 source_location
             };
 
-            let end_location = diagnostic.expect_ruff_end_location();
+            let end_location = diagnostic.ruff_end_location().unwrap_or_default();
 
             write!(
                 writer,

crates/ruff_linter/src/message/grouped.rs

@@ -105,7 +105,7 @@ fn group_diagnostics_by_filename(
             .or_insert_with(Vec::new)
             .push(MessageWithLocation {
                 message: diagnostic,
-                start_location: diagnostic.expect_ruff_start_location(),
+                start_location: diagnostic.ruff_start_location().unwrap_or_default(),
             });
     }
     grouped_messages

crates/ruff_linter/src/message/sarif.rs

@@ -158,8 +158,8 @@ struct SarifResult<'a> {
 impl<'a> SarifResult<'a> {
     #[cfg(not(target_arch = "wasm32"))]
     fn from_message(message: &'a Diagnostic) -> Result<Self> {
-        let start_location = message.expect_ruff_start_location();
-        let end_location = message.expect_ruff_end_location();
+        let start_location = message.ruff_start_location().unwrap_or_default();
+        let end_location = message.ruff_end_location().unwrap_or_default();
         let path = normalize_path(&*message.expect_ruff_filename());
         Ok(Self {
             code: RuleCode::from(message),
@@ -178,8 +178,8 @@ impl<'a> SarifResult<'a> {
     #[cfg(target_arch = "wasm32")]
     #[expect(clippy::unnecessary_wraps)]
     fn from_message(message: &'a Diagnostic) -> Result<Self> {
-        let start_location = message.expect_ruff_start_location();
-        let end_location = message.expect_ruff_end_location();
+        let start_location = message.ruff_start_location().unwrap_or_default();
+        let end_location = message.ruff_end_location().unwrap_or_default();
         let path = normalize_path(&*message.expect_ruff_filename());
         Ok(Self {
             code: RuleCode::from(message),

crates/ruff_linter/src/preview.rs

@@ -260,3 +260,10 @@ pub(crate) const fn is_maxsplit_without_separator_fix_enabled(settings: &LinterS
 pub(crate) const fn is_bidi_forbid_arabic_letter_mark_enabled(settings: &LinterSettings) -> bool {
     settings.preview.is_enabled()
 }
+
+// https://github.com/astral-sh/ruff/pull/20027
+pub(crate) const fn is_unnecessary_default_type_args_stubs_enabled(
+    settings: &LinterSettings,
+) -> bool {
+    settings.preview.is_enabled()
+}

crates/ruff_linter/src/rules/airflow/helpers.rs

@@ -37,7 +37,6 @@ pub(crate) enum Replacement {
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub(crate) enum ProviderReplacement {
-    None,
     AutoImport {
         module: &'static str,
         name: &'static str,

crates/ruff_linter/src/rules/airflow/rules/dag_schedule_argument.rs

@@ -46,7 +46,7 @@ pub(crate) struct AirflowDagNoScheduleArgument;
 impl Violation for AirflowDagNoScheduleArgument {
     #[derive_message_formats]
     fn message(&self) -> String {
-        "DAG should have an explicit `schedule` argument".to_string()
+        "`DAG` or `@dag` should have an explicit `schedule` argument".to_string()
     }
 }
 

crates/ruff_linter/src/rules/airflow/rules/moved_to_provider_in_3.rs

@@ -50,9 +50,6 @@ impl Violation for Airflow3MovedToProvider<'_> {
             replacement,
         } = self;
         match replacement {
-            ProviderReplacement::None => {
-                format!("`{deprecated}` is removed in Airflow 3.0")
-            }
             ProviderReplacement::AutoImport {
                 name: _,
                 module: _,
@@ -85,7 +82,6 @@ impl Violation for Airflow3MovedToProvider<'_> {
                 provider,
                 version,
             } => Some((module, name.as_str(), provider, version)),
-            ProviderReplacement::None => None,
         } {
             Some(format!(
                 "Install `apache-airflow-providers-{provider}>={version}` and use `{name}` from `{module}` instead."
@@ -1020,7 +1016,6 @@ fn check_names_moved_to_provider(checker: &Checker, expr: &Expr, ranged: TextRan
             provider: "postgres",
             version: "1.0.0",
         },
-        ["airflow", "operators", "postgres_operator", "Mapping"] => ProviderReplacement::None,
 
         // apache-airflow-providers-presto
         ["airflow", "hooks", "presto_hook", "PrestoHook"] => ProviderReplacement::AutoImport {
@@ -1209,16 +1204,6 @@ fn check_names_moved_to_provider(checker: &Checker, expr: &Expr, ranged: TextRan
         ProviderReplacement::SourceModuleMovedToProvider { module, name, .. } => {
             (module, name.as_str())
         }
-        ProviderReplacement::None => {
-            checker.report_diagnostic(
-                Airflow3MovedToProvider {
-                    deprecated: qualified_name,
-                    replacement,
-                },
-                ranged,
-            );
-            return;
-        }
     };
 
     if is_guarded_by_try_except(expr, module, name, checker.semantic()) {

crates/ruff_linter/src/rules/airflow/rules/removal_in_3.rs

@@ -704,6 +704,7 @@ fn check_name(checker: &Checker, expr: &Expr, range: TextRange) {
         ["airflow", "operators", "subdag", ..] => {
             Replacement::Message("The whole `airflow.subdag` module has been removed.")
         }
+        ["airflow", "operators", "postgres_operator", "Mapping"] => Replacement::None,
         ["airflow", "operators", "python", "get_current_context"] => Replacement::AutoImport {
             module: "airflow.sdk",
             name: "get_current_context",

crates/ruff_linter/src/rules/airflow/rules/suggested_to_move_to_provider_in_3.rs

@@ -65,9 +65,6 @@ impl Violation for Airflow3SuggestedToMoveToProvider<'_> {
             replacement,
         } = self;
         match replacement {
-            ProviderReplacement::None => {
-                format!("`{deprecated}` is removed in Airflow 3.0")
-            }
             ProviderReplacement::AutoImport {
                 name: _,
                 module: _,
@@ -91,7 +88,6 @@ impl Violation for Airflow3SuggestedToMoveToProvider<'_> {
     fn fix_title(&self) -> Option<String> {
         let Airflow3SuggestedToMoveToProvider { replacement, .. } = self;
         match replacement {
-            ProviderReplacement::None => None,
             ProviderReplacement::AutoImport {
                 module,
                 name,
@@ -319,16 +315,6 @@ fn check_names_moved_to_provider(checker: &Checker, expr: &Expr, ranged: TextRan
         ProviderReplacement::SourceModuleMovedToProvider { module, name, .. } => {
             (module, name.as_str())
         }
-        ProviderReplacement::None => {
-            checker.report_diagnostic(
-                Airflow3SuggestedToMoveToProvider {
-                    deprecated: qualified_name,
-                    replacement: replacement.clone(),
-                },
-                ranged.range(),
-            );
-            return;
-        }
     };
 
     if is_guarded_by_try_except(expr, module, name, checker.semantic()) {

crates/ruff_linter/src/rules/airflow/rules/suggested_to_update_3_0.rs

@@ -157,6 +157,9 @@ fn check_call_arguments(checker: &Checker, qualified_name: &QualifiedName, argum
         ["airflow", .., "DAG" | "dag"] => {
             diagnostic_for_argument(checker, arguments, "sla_miss_callback", None);
         }
+        ["airflow", "timetables", "datasets", "DatasetOrTimeSchedule"] => {
+            diagnostic_for_argument(checker, arguments, "datasets", Some("assets"));
+        }
         segments => {
             if is_airflow_builtin_or_provider(segments, "operators", "Operator") {
                 diagnostic_for_argument(checker, arguments, "sla", None);

crates/ruff_linter/src/rules/airflow/snapshots/ruff_linter__rules__airflow__tests__AIR002_AIR002.py.snap

@@ -1,7 +1,7 @@
 ---
 source: crates/ruff_linter/src/rules/airflow/mod.rs
 ---
-AIR002 DAG should have an explicit `schedule` argument
+AIR002 `DAG` or `@dag` should have an explicit `schedule` argument
  --> AIR002.py:4:1
   |
 2 | from airflow.timetables.simple import NullTimetable
@@ -12,7 +12,7 @@ AIR002 DAG should have an explicit `schedule` argument
 6 | DAG(dag_id="class_schedule", schedule="@hourly")
   |
 
-AIR002 DAG should have an explicit `schedule` argument
+AIR002 `DAG` or `@dag` should have an explicit `schedule` argument
   --> AIR002.py:13:2
    |
 13 | @dag()

crates/ruff_linter/src/rules/airflow/snapshots/ruff_linter__rules__airflow__tests__AIR301_AIR301_names.py.snap

@@ -2,350 +2,362 @@
 source: crates/ruff_linter/src/rules/airflow/mod.rs
 ---
 AIR301 `airflow.PY36` is removed in Airflow 3.0
-  --> AIR301_names.py:39:1
+  --> AIR301_names.py:40:1
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    | ^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY37` is removed in Airflow 3.0
-  --> AIR301_names.py:39:7
+  --> AIR301_names.py:40:7
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |       ^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY38` is removed in Airflow 3.0
-  --> AIR301_names.py:39:13
+  --> AIR301_names.py:40:13
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |             ^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY39` is removed in Airflow 3.0
-  --> AIR301_names.py:39:19
+  --> AIR301_names.py:40:19
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |                   ^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY310` is removed in Airflow 3.0
-  --> AIR301_names.py:39:25
+  --> AIR301_names.py:40:25
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |                         ^^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY311` is removed in Airflow 3.0
-  --> AIR301_names.py:39:32
+  --> AIR301_names.py:40:32
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |                                ^^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.PY312` is removed in Airflow 3.0
-  --> AIR301_names.py:39:39
+  --> AIR301_names.py:40:39
    |
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
    |                                       ^^^^^
-40 |
-41 | # airflow.api_connexion.security
+41 |
+42 | # airflow.api_connexion.security
    |
 help: Use `sys.version_info` instead
 
 AIR301 `airflow.api_connexion.security.requires_access` is removed in Airflow 3.0
-  --> AIR301_names.py:42:1
+  --> AIR301_names.py:43:1
    |
-41 | # airflow.api_connexion.security
-42 | requires_access
+42 | # airflow.api_connexion.security
+43 | requires_access
    | ^^^^^^^^^^^^^^^
-43 |
-44 | # airflow.contrib.*
+44 |
+45 | # airflow.contrib.*
    |
 help: Use `airflow.api_fastapi.core_api.security.requires_access_*` instead
 
 AIR301 `airflow.contrib.aws_athena_hook.AWSAthenaHook` is removed in Airflow 3.0
-  --> AIR301_names.py:45:1
+  --> AIR301_names.py:46:1
    |
-44 | # airflow.contrib.*
-45 | AWSAthenaHook()
+45 | # airflow.contrib.*
+46 | AWSAthenaHook()
    | ^^^^^^^^^^^^^
    |
 help: The whole `airflow.contrib` module has been removed.
 
 AIR301 `airflow.datasets.DatasetAliasEvent` is removed in Airflow 3.0
-  --> AIR301_names.py:49:1
+  --> AIR301_names.py:50:1
    |
-48 | # airflow.datasets
-49 | DatasetAliasEvent()
+49 | # airflow.datasets
+50 | DatasetAliasEvent()
    | ^^^^^^^^^^^^^^^^^
    |
 
 AIR301 `airflow.operators.subdag.SubDagOperator` is removed in Airflow 3.0
-  --> AIR301_names.py:53:1
+  --> AIR301_names.py:54:1
    |
-52 | # airflow.operators.subdag.*
-53 | SubDagOperator()
+53 | # airflow.operators.subdag.*
+54 | SubDagOperator()
    | ^^^^^^^^^^^^^^
+55 |
+56 | # airflow.operators.postgres_operator
    |
 help: The whole `airflow.subdag` module has been removed.
 
-AIR301 [*] `airflow.secrets.cache.SecretCache` is removed in Airflow 3.0
-  --> AIR301_names.py:61:1
+AIR301 `airflow.operators.postgres_operator.Mapping` is removed in Airflow 3.0
+  --> AIR301_names.py:57:1
    |
-60 | # airflow.secrets.cache
-61 | SecretCache()
+56 | # airflow.operators.postgres_operator
+57 | Mapping()
+   | ^^^^^^^
+58 |
+59 | # airflow.secrets
+   |
+
+AIR301 [*] `airflow.secrets.cache.SecretCache` is removed in Airflow 3.0
+  --> AIR301_names.py:64:1
+   |
+63 | # airflow.secrets.cache
+64 | SecretCache()
    | ^^^^^^^^^^^
    |
 help: Use `SecretCache` from `airflow.sdk` instead.
-13 | from airflow.contrib.aws_athena_hook import AWSAthenaHook
 14 | from airflow.datasets import DatasetAliasEvent
-15 | from airflow.operators.subdag import SubDagOperator
+15 | from airflow.operators.postgres_operator import Mapping
+16 | from airflow.operators.subdag import SubDagOperator
    - from airflow.secrets.cache import SecretCache
-16 | from airflow.secrets.local_filesystem import LocalFilesystemBackend
-17 | from airflow.triggers.external_task import TaskStateTrigger
-18 | from airflow.utils import dates
+17 | from airflow.secrets.local_filesystem import LocalFilesystemBackend
+18 | from airflow.triggers.external_task import TaskStateTrigger
+19 | from airflow.utils import dates
 --------------------------------------------------------------------------------
-33 | from airflow.utils.trigger_rule import TriggerRule
-34 | from airflow.www.auth import has_access, has_access_dataset
-35 | from airflow.www.utils import get_sensitive_variables_fields, should_hide_value_for_key
-36 + from airflow.sdk import SecretCache
-37 | 
-38 | # airflow root
-39 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
+34 | from airflow.utils.trigger_rule import TriggerRule
+35 | from airflow.www.auth import has_access, has_access_dataset
+36 | from airflow.www.utils import get_sensitive_variables_fields, should_hide_value_for_key
+37 + from airflow.sdk import SecretCache
+38 | 
+39 | # airflow root
+40 | PY36, PY37, PY38, PY39, PY310, PY311, PY312
 note: This is an unsafe fix and may change runtime behavior
 
 AIR301 `airflow.triggers.external_task.TaskStateTrigger` is removed in Airflow 3.0
-  --> AIR301_names.py:65:1
-   |
-64 | # airflow.triggers.external_task
-65 | TaskStateTrigger()
-   | ^^^^^^^^^^^^^^^^
-66 |
-67 | # airflow.utils.date
-   |
-
-AIR301 `airflow.utils.dates.date_range` is removed in Airflow 3.0
   --> AIR301_names.py:68:1
    |
-67 | # airflow.utils.date
-68 | dates.date_range
+67 | # airflow.triggers.external_task
+68 | TaskStateTrigger()
    | ^^^^^^^^^^^^^^^^
-69 | dates.days_ago
+69 |
+70 | # airflow.utils.date
    |
 
-AIR301 `airflow.utils.dates.days_ago` is removed in Airflow 3.0
-  --> AIR301_names.py:69:1
-   |
-67 | # airflow.utils.date
-68 | dates.date_range
-69 | dates.days_ago
-   | ^^^^^^^^^^^^^^
-70 |
-71 | date_range
-   |
-help: Use `pendulum.today('UTC').add(days=-N, ...)` instead
-
 AIR301 `airflow.utils.dates.date_range` is removed in Airflow 3.0
   --> AIR301_names.py:71:1
    |
-69 | dates.days_ago
-70 |
-71 | date_range
-   | ^^^^^^^^^^
-72 | days_ago
-73 | infer_time_unit
+70 | # airflow.utils.date
+71 | dates.date_range
+   | ^^^^^^^^^^^^^^^^
+72 | dates.days_ago
    |
 
 AIR301 `airflow.utils.dates.days_ago` is removed in Airflow 3.0
   --> AIR301_names.py:72:1
    |
-71 | date_range
-72 | days_ago
+70 | # airflow.utils.date
+71 | dates.date_range
+72 | dates.days_ago
+   | ^^^^^^^^^^^^^^
+73 |
+74 | date_range
+   |
+help: Use `pendulum.today('UTC').add(days=-N, ...)` instead
+
+AIR301 `airflow.utils.dates.date_range` is removed in Airflow 3.0
+  --> AIR301_names.py:74:1
+   |
+72 | dates.days_ago
+73 |
+74 | date_range
+   | ^^^^^^^^^^
+75 | days_ago
+76 | infer_time_unit
+   |
+
+AIR301 `airflow.utils.dates.days_ago` is removed in Airflow 3.0
+  --> AIR301_names.py:75:1
+   |
+74 | date_range
+75 | days_ago
    | ^^^^^^^^
-73 | infer_time_unit
-74 | parse_execution_date
+76 | infer_time_unit
+77 | parse_execution_date
    |
 help: Use `pendulum.today('UTC').add(days=-N, ...)` instead
 
 AIR301 `airflow.utils.dates.infer_time_unit` is removed in Airflow 3.0
-  --> AIR301_names.py:73:1
+  --> AIR301_names.py:76:1
    |
-71 | date_range
-72 | days_ago
-73 | infer_time_unit
+74 | date_range
+75 | days_ago
+76 | infer_time_unit
    | ^^^^^^^^^^^^^^^
-74 | parse_execution_date
-75 | round_time
+77 | parse_execution_date
+78 | round_time
    |
 
 AIR301 `airflow.utils.dates.parse_execution_date` is removed in Airflow 3.0
-  --> AIR301_names.py:74:1
+  --> AIR301_names.py:77:1
    |
-72 | days_ago
-73 | infer_time_unit
-74 | parse_execution_date
+75 | days_ago
+76 | infer_time_unit
+77 | parse_execution_date
    | ^^^^^^^^^^^^^^^^^^^^
-75 | round_time
-76 | scale_time_units
+78 | round_time
+79 | scale_time_units
    |
 
 AIR301 `airflow.utils.dates.round_time` is removed in Airflow 3.0
-  --> AIR301_names.py:75:1
+  --> AIR301_names.py:78:1
    |
-73 | infer_time_unit
-74 | parse_execution_date
-75 | round_time
+76 | infer_time_unit
+77 | parse_execution_date
+78 | round_time
    | ^^^^^^^^^^
-76 | scale_time_units
+79 | scale_time_units
    |
 
 AIR301 `airflow.utils.dates.scale_time_units` is removed in Airflow 3.0
-  --> AIR301_names.py:76:1
+  --> AIR301_names.py:79:1
    |
-74 | parse_execution_date
-75 | round_time
-76 | scale_time_units
+77 | parse_execution_date
+78 | round_time
+79 | scale_time_units
    | ^^^^^^^^^^^^^^^^
-77 |
-78 | # This one was not deprecated.
+80 |
+81 | # This one was not deprecated.
    |
 
 AIR301 `airflow.utils.dag_cycle_tester.test_cycle` is removed in Airflow 3.0
-  --> AIR301_names.py:83:1
+  --> AIR301_names.py:86:1
    |
-82 | # airflow.utils.dag_cycle_tester
-83 | test_cycle
+85 | # airflow.utils.dag_cycle_tester
+86 | test_cycle
    | ^^^^^^^^^^
    |
 
 AIR301 `airflow.utils.db.create_session` is removed in Airflow 3.0
-  --> AIR301_names.py:87:1
+  --> AIR301_names.py:90:1
    |
-86 | # airflow.utils.db
-87 | create_session
+89 | # airflow.utils.db
+90 | create_session
    | ^^^^^^^^^^^^^^
-88 |
-89 | # airflow.utils.decorators
+91 |
+92 | # airflow.utils.decorators
    |
 
 AIR301 `airflow.utils.decorators.apply_defaults` is removed in Airflow 3.0
-  --> AIR301_names.py:90:1
+  --> AIR301_names.py:93:1
    |
-89 | # airflow.utils.decorators
-90 | apply_defaults
+92 | # airflow.utils.decorators
+93 | apply_defaults
    | ^^^^^^^^^^^^^^
-91 |
-92 | # airflow.utils.file
+94 |
+95 | # airflow.utils.file
    |
 help: `apply_defaults` is now unconditionally done and can be safely removed.
 
 AIR301 `airflow.utils.file.mkdirs` is removed in Airflow 3.0
-  --> AIR301_names.py:93:1
+  --> AIR301_names.py:96:1
    |
-92 | # airflow.utils.file
-93 | mkdirs
+95 | # airflow.utils.file
+96 | mkdirs
    | ^^^^^^
    |
 help: Use `pathlib.Path({path}).mkdir` instead
 
 AIR301 `airflow.utils.state.SHUTDOWN` is removed in Airflow 3.0
-  --> AIR301_names.py:97:1
-   |
-96 | # airflow.utils.state
-97 | SHUTDOWN
-   | ^^^^^^^^
-98 | terminating_states
-   |
+   --> AIR301_names.py:100:1
+    |
+ 99 | # airflow.utils.state
+100 | SHUTDOWN
+    | ^^^^^^^^
+101 | terminating_states
+    |
 
 AIR301 `airflow.utils.state.terminating_states` is removed in Airflow 3.0
-   --> AIR301_names.py:98:1
+   --> AIR301_names.py:101:1
     |
- 96 | # airflow.utils.state
- 97 | SHUTDOWN
- 98 | terminating_states
+ 99 | # airflow.utils.state
+100 | SHUTDOWN
+101 | terminating_states
     | ^^^^^^^^^^^^^^^^^^
- 99 |
-100 | #  airflow.utils.trigger_rule
+102 |
+103 | #  airflow.utils.trigger_rule
     |
 
 AIR301 `airflow.utils.trigger_rule.TriggerRule.DUMMY` is removed in Airflow 3.0
-   --> AIR301_names.py:101:1
+   --> AIR301_names.py:104:1
     |
-100 | #  airflow.utils.trigger_rule
-101 | TriggerRule.DUMMY
+103 | #  airflow.utils.trigger_rule
+104 | TriggerRule.DUMMY
     | ^^^^^^^^^^^^^^^^^
-102 | TriggerRule.NONE_FAILED_OR_SKIPPED
+105 | TriggerRule.NONE_FAILED_OR_SKIPPED
     |
 
 AIR301 `airflow.utils.trigger_rule.TriggerRule.NONE_FAILED_OR_SKIPPED` is removed in Airflow 3.0
-   --> AIR301_names.py:102:1
+   --> AIR301_names.py:105:1
     |
-100 | #  airflow.utils.trigger_rule
-101 | TriggerRule.DUMMY
-102 | TriggerRule.NONE_FAILED_OR_SKIPPED
+103 | #  airflow.utils.trigger_rule
+104 | TriggerRule.DUMMY
+105 | TriggerRule.NONE_FAILED_OR_SKIPPED
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
 
 AIR301 `airflow.www.auth.has_access` is removed in Airflow 3.0
-   --> AIR301_names.py:106:1
+   --> AIR301_names.py:109:1
     |
-105 | # airflow.www.auth
-106 | has_access
+108 | # airflow.www.auth
+109 | has_access
     | ^^^^^^^^^^
-107 | has_access_dataset
+110 | has_access_dataset
     |
 
 AIR301 `airflow.www.auth.has_access_dataset` is removed in Airflow 3.0
-   --> AIR301_names.py:107:1
+   --> AIR301_names.py:110:1
     |
-105 | # airflow.www.auth
-106 | has_access
-107 | has_access_dataset
+108 | # airflow.www.auth
+109 | has_access
+110 | has_access_dataset
     | ^^^^^^^^^^^^^^^^^^
-108 |
-109 | # airflow.www.utils
+111 |
+112 | # airflow.www.utils
     |
 
 AIR301 `airflow.www.utils.get_sensitive_variables_fields` is removed in Airflow 3.0
-   --> AIR301_names.py:110:1
+   --> AIR301_names.py:113:1
     |
-109 | # airflow.www.utils
-110 | get_sensitive_variables_fields
+112 | # airflow.www.utils
+113 | get_sensitive_variables_fields
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-111 | should_hide_value_for_key
+114 | should_hide_value_for_key
     |
 
 AIR301 `airflow.www.utils.should_hide_value_for_key` is removed in Airflow 3.0
-   --> AIR301_names.py:111:1
+   --> AIR301_names.py:114:1
     |
-109 | # airflow.www.utils
-110 | get_sensitive_variables_fields
-111 | should_hide_value_for_key
+112 | # airflow.www.utils
+113 | get_sensitive_variables_fields
+114 | should_hide_value_for_key
     | ^^^^^^^^^^^^^^^^^^^^^^^^^
     |

crates/ruff_linter/src/rules/airflow/snapshots/ruff_linter__rules__airflow__tests__AIR302_AIR302_postgres.py.snap

@@ -20,11 +20,3 @@ help: Install `apache-airflow-providers-postgres>=1.0.0` and use `PostgresHook`
 6 | PostgresHook()
 7 | Mapping()
 note: This is an unsafe fix and may change runtime behavior
-
-AIR302 `airflow.operators.postgres_operator.Mapping` is removed in Airflow 3.0
- --> AIR302_postgres.py:7:1
-  |
-6 | PostgresHook()
-7 | Mapping()
-  | ^^^^^^^
-  |

crates/ruff_linter/src/rules/airflow/snapshots/ruff_linter__rules__airflow__tests__AIR311_AIR311_names.py.snap

@@ -558,7 +558,7 @@ AIR311 [*] `airflow.timetables.datasets.DatasetOrTimeSchedule` is removed in Air
   --> AIR311_names.py:73:1
    |
 72 | # airflow.timetables.datasets
-73 | DatasetOrTimeSchedule()
+73 | DatasetOrTimeSchedule(datasets=[])
    | ^^^^^^^^^^^^^^^^^^^^^
 74 |
 75 | # airflow.utils.dag_parsing_context
@@ -570,12 +570,31 @@ help: Use `AssetOrTimeSchedule` from `airflow.timetables.assets` instead.
 71 + from airflow.timetables.assets import AssetOrTimeSchedule
 72 | 
 73 | # airflow.timetables.datasets
-   - DatasetOrTimeSchedule()
-74 + AssetOrTimeSchedule()
+   - DatasetOrTimeSchedule(datasets=[])
+74 + AssetOrTimeSchedule(datasets=[])
 75 | 
 76 | # airflow.utils.dag_parsing_context
 77 | get_parsing_context()
 
+AIR311 [*] `datasets` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.
+  --> AIR311_names.py:73:23
+   |
+72 | # airflow.timetables.datasets
+73 | DatasetOrTimeSchedule(datasets=[])
+   |                       ^^^^^^^^
+74 |
+75 | # airflow.utils.dag_parsing_context
+   |
+help: Use `assets` instead
+70 | from airflow.utils.dag_parsing_context import get_parsing_context
+71 | 
+72 | # airflow.timetables.datasets
+   - DatasetOrTimeSchedule(datasets=[])
+73 + DatasetOrTimeSchedule(assets=[])
+74 | 
+75 | # airflow.utils.dag_parsing_context
+76 | get_parsing_context()
+
 AIR311 [*] `airflow.utils.dag_parsing_context.get_parsing_context` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.
   --> AIR311_names.py:76:1
    |
@@ -593,7 +612,7 @@ help: Use `get_parsing_context` from `airflow.sdk` instead.
 70 + from airflow.sdk import get_parsing_context
 71 | 
 72 | # airflow.timetables.datasets
-73 | DatasetOrTimeSchedule()
+73 | DatasetOrTimeSchedule(datasets=[])
 note: This is an unsafe fix and may change runtime behavior
 
 AIR311 [*] `airflow.decorators.base.DecoratedMappedOperator` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.

crates/ruff_linter/src/rules/fastapi/rules/fastapi_unused_path_parameter.rs

@@ -79,7 +79,6 @@ impl Violation for FastApiUnusedPathParameter {
             function_name,
             is_positional,
         } = self;
-        #[expect(clippy::if_not_else)]
         if !is_positional {
             format!(
                 "Parameter `{arg_name}` appears in route path, but not in `{function_name}` signature"

crates/ruff_linter/src/rules/flake8_comprehensions/rules/unnecessary_map.rs

@@ -122,6 +122,13 @@ pub(crate) fn unnecessary_map(checker: &Checker, call: &ast::ExprCall) {
         }
     };
 
+    // If the lambda body contains a `yield` or `yield from`, rewriting `map(lambda ...)` to a
+    // generator expression or any comprehension is invalid Python syntax
+    // (e.g., `yield` is not allowed inside generator or comprehension expressions). In such cases, skip.
+    if lambda_contains_yield(&lambda.body) {
+        return;
+    }
+
     for iterable in iterables {
         // For example, (x+1 for x in (c:=a)) is invalid syntax
         // so we can't suggest it.
@@ -183,6 +190,13 @@ fn map_lambda_and_iterables<'a>(
     Some((lambda, iterables))
 }
 
+/// Returns true if the expression tree contains a `yield` or `yield from` expression.
+fn lambda_contains_yield(expr: &Expr) -> bool {
+    any_over_expr(expr, &|expr| {
+        matches!(expr, Expr::Yield(_) | Expr::YieldFrom(_))
+    })
+}
+
 /// A lambda as the first argument to `map()` has the "expected" arity when:
 ///
 /// * It has exactly one parameter

crates/ruff_linter/src/rules/flake8_comprehensions/snapshots/ruff_linter__rules__flake8_comprehensions__tests__C417_C417.py.snap

@@ -342,6 +342,7 @@ help: Replace `map()` with a set comprehension
 75 + _ = t"{ {x % 2 == 0 for x in nums} }"
 76 | _ = t"{dict(map(lambda v: (v, v**2), nums))}"
 77 | 
+78 | 
 note: This is an unsafe fix and may change runtime behavior
 
 C417 [*] Unnecessary `map()` usage (rewrite using a dict comprehension)
@@ -359,4 +360,6 @@ help: Replace `map()` with a dict comprehension
    - _ = t"{dict(map(lambda v: (v, v**2), nums))}"
 76 + _ = t"{ {v: v**2 for v in nums} }"
 77 | 
+78 | 
+79 | # See https://github.com/astral-sh/ruff/issues/20198
 note: This is an unsafe fix and may change runtime behavior

crates/ruff_linter/src/rules/flake8_pyi/rules/pre_pep570_positional_argument.rs

@@ -1,6 +1,6 @@
 use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast as ast;
 use ruff_python_ast::identifier::Identifier;
-use ruff_python_ast::{self as ast, ParameterWithDefault};
 use ruff_python_semantic::analyze::function_type;
 
 use crate::Violation;
@@ -85,16 +85,9 @@ pub(crate) fn pep_484_positional_parameter(checker: &Checker, function_def: &ast
         function_type::FunctionType::Method | function_type::FunctionType::ClassMethod
     ));
 
-    if let Some(arg) = function_def.parameters.args.get(skip) {
-        if is_old_style_positional_only(arg) {
-            checker.report_diagnostic(Pep484StylePositionalOnlyParameter, arg.identifier());
+    if let Some(param) = function_def.parameters.args.get(skip) {
+        if param.uses_pep_484_positional_only_convention() {
+            checker.report_diagnostic(Pep484StylePositionalOnlyParameter, param.identifier());
         }
     }
 }
-
-/// Returns `true` if the [`ParameterWithDefault`] is an old-style positional-only parameter (i.e.,
-/// its name starts with `__` and does not end with `__`).
-fn is_old_style_positional_only(param: &ParameterWithDefault) -> bool {
-    let arg_name = param.name();
-    arg_name.starts_with("__") && !arg_name.ends_with("__")
-}

crates/ruff_linter/src/rules/flake8_use_pathlib/helpers.rs

@@ -60,6 +60,7 @@ pub(crate) fn check_os_pathlib_single_arg_calls(
     fn_argument: &str,
     fix_enabled: bool,
     violation: impl Violation,
+    applicability: Option<Applicability>,
 ) {
     if call.arguments.len() != 1 {
         return;
@@ -74,33 +75,39 @@ pub(crate) fn check_os_pathlib_single_arg_calls(
 
     let mut diagnostic = checker.report_diagnostic(violation, call.func.range());
 
-    if fix_enabled {
-        diagnostic.try_set_fix(|| {
-            let (import_edit, binding) = checker.importer().get_or_import_symbol(
-                &ImportRequest::import("pathlib", "Path"),
-                call.start(),
-                checker.semantic(),
-            )?;
-
-            let applicability = if checker.comment_ranges().intersects(range) {
-                Applicability::Unsafe
-            } else {
-                Applicability::Safe
-            };
-
-            let replacement = if is_pathlib_path_call(checker, arg) {
-                format!("{arg_code}.{attr}")
-            } else {
-                format!("{binding}({arg_code}).{attr}")
-            };
-
-            Ok(Fix::applicable_edits(
-                Edit::range_replacement(replacement, range),
-                [import_edit],
-                applicability,
-            ))
-        });
+    if !fix_enabled {
+        return;
     }
+
+    diagnostic.try_set_fix(|| {
+        let (import_edit, binding) = checker.importer().get_or_import_symbol(
+            &ImportRequest::import("pathlib", "Path"),
+            call.start(),
+            checker.semantic(),
+        )?;
+
+        let replacement = if is_pathlib_path_call(checker, arg) {
+            format!("{arg_code}.{attr}")
+        } else {
+            format!("{binding}({arg_code}).{attr}")
+        };
+
+        let edit = Edit::range_replacement(replacement, range);
+
+        let fix = match applicability {
+            Some(Applicability::Unsafe) => Fix::unsafe_edits(edit, [import_edit]),
+            _ => {
+                let applicability = if checker.comment_ranges().intersects(range) {
+                    Applicability::Unsafe
+                } else {
+                    Applicability::Safe
+                };
+                Fix::applicable_edits(edit, [import_edit], applicability)
+            }
+        };
+
+        Ok(fix)
+    });
 }
 
 pub(crate) fn get_name_expr(expr: &Expr) -> Option<&ast::ExprName> {

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_basename.rs

@@ -1,9 +1,11 @@
+use ruff_diagnostics::Applicability;
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_basename_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.basename`.
@@ -34,7 +36,16 @@ use ruff_python_ast::ExprCall;
 /// especially on older versions of Python.
 ///
 /// ## Fix Safety
-/// This rule's fix is marked as unsafe if the replacement would remove comments attached to the original expression.
+/// This rule's fix is always marked as unsafe because the replacement is not always semantically
+/// equivalent to the original code. In particular, `pathlib` performs path normalization,
+/// which can alter the result compared to `os.path.basename`. For example, this normalization:
+///
+/// - Collapses consecutive slashes (e.g., `"a//b"` → `"a/b"`).
+/// - Removes trailing slashes (e.g., `"a/b/"` → `"a/b"`).
+/// - Eliminates `"."` (e.g., `"a/./b"` → `"a/b"`).
+///
+/// As a result, code relying on the exact string returned by `os.path.basename`
+/// may behave differently after the fix.
 ///
 /// ## References
 /// - [Python documentation: `PurePath.name`](https://docs.python.org/3/library/pathlib.html#pathlib.PurePath.name)
@@ -62,6 +73,7 @@ pub(crate) fn os_path_basename(checker: &Checker, call: &ExprCall, segments: &[&
     if segments != ["os", "path", "basename"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -69,5 +81,6 @@ pub(crate) fn os_path_basename(checker: &Checker, call: &ExprCall, segments: &[&
         "p",
         is_fix_os_path_basename_enabled(checker.settings()),
         OsPathBasename,
+        Some(Applicability::Unsafe),
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_dirname.rs

@@ -1,9 +1,11 @@
+use ruff_diagnostics::Applicability;
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_dirname_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.dirname`.
@@ -29,7 +31,16 @@ use ruff_python_ast::ExprCall;
 /// ```
 ///
 /// ## Fix Safety
-/// This rule's fix is marked as unsafe if the replacement would remove comments attached to the original expression.
+/// This rule's fix is always marked as unsafe because the replacement is not always semantically
+/// equivalent to the original code. In particular, `pathlib` performs path normalization,
+/// which can alter the result compared to `os.path.dirname`. For example, this normalization:
+///
+/// - Collapses consecutive slashes (e.g., `"a//b"` → `"a/b"`).
+/// - Removes trailing slashes (e.g., `"a/b/"` → `"a/b"`).
+/// - Eliminates `"."` (e.g., `"a/./b"` → `"a/b"`).
+///
+/// As a result, code relying on the exact string returned by `os.path.dirname`
+/// may behave differently after the fix.
 ///
 /// ## Known issues
 /// While using `pathlib` can improve the readability and type safety of your code,
@@ -62,6 +73,7 @@ pub(crate) fn os_path_dirname(checker: &Checker, call: &ExprCall, segments: &[&s
     if segments != ["os", "path", "dirname"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -69,5 +81,6 @@ pub(crate) fn os_path_dirname(checker: &Checker, call: &ExprCall, segments: &[&s
         "p",
         is_fix_os_path_dirname_enabled(checker.settings()),
         OsPathDirname,
+        Some(Applicability::Unsafe),
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_exists.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_exists_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.exists`.
@@ -62,6 +63,7 @@ pub(crate) fn os_path_exists(checker: &Checker, call: &ExprCall, segments: &[&st
     if segments != ["os", "path", "exists"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -69,5 +71,6 @@ pub(crate) fn os_path_exists(checker: &Checker, call: &ExprCall, segments: &[&st
         "path",
         is_fix_os_path_exists_enabled(checker.settings()),
         OsPathExists,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_expanduser.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_expanduser_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.expanduser`.
@@ -62,6 +63,7 @@ pub(crate) fn os_path_expanduser(checker: &Checker, call: &ExprCall, segments: &
     if segments != ["os", "path", "expanduser"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -69,5 +71,6 @@ pub(crate) fn os_path_expanduser(checker: &Checker, call: &ExprCall, segments: &
         "path",
         is_fix_os_path_expanduser_enabled(checker.settings()),
         OsPathExpanduser,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_getatime.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_getatime_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.getatime`.
@@ -65,6 +66,7 @@ pub(crate) fn os_path_getatime(checker: &Checker, call: &ExprCall, segments: &[&
     if segments != ["os", "path", "getatime"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -72,5 +74,6 @@ pub(crate) fn os_path_getatime(checker: &Checker, call: &ExprCall, segments: &[&
         "filename",
         is_fix_os_path_getatime_enabled(checker.settings()),
         OsPathGetatime,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_getctime.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_getctime_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.getctime`.
@@ -66,6 +67,7 @@ pub(crate) fn os_path_getctime(checker: &Checker, call: &ExprCall, segments: &[&
     if segments != ["os", "path", "getctime"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -73,5 +75,6 @@ pub(crate) fn os_path_getctime(checker: &Checker, call: &ExprCall, segments: &[&
         "filename",
         is_fix_os_path_getctime_enabled(checker.settings()),
         OsPathGetctime,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_getmtime.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_getmtime_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.getmtime`.
@@ -66,6 +67,7 @@ pub(crate) fn os_path_getmtime(checker: &Checker, call: &ExprCall, segments: &[&
     if segments != ["os", "path", "getmtime"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -73,5 +75,6 @@ pub(crate) fn os_path_getmtime(checker: &Checker, call: &ExprCall, segments: &[&
         "filename",
         is_fix_os_path_getmtime_enabled(checker.settings()),
         OsPathGetmtime,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_getsize.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_getsize_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.getsize`.
@@ -66,6 +67,7 @@ pub(crate) fn os_path_getsize(checker: &Checker, call: &ExprCall, segments: &[&s
     if segments != ["os", "path", "getsize"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -73,5 +75,6 @@ pub(crate) fn os_path_getsize(checker: &Checker, call: &ExprCall, segments: &[&s
         "filename",
         is_fix_os_path_getsize_enabled(checker.settings()),
         OsPathGetsize,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_isabs.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_isabs_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.isabs`.
@@ -61,6 +62,7 @@ pub(crate) fn os_path_isabs(checker: &Checker, call: &ExprCall, segments: &[&str
     if segments != ["os", "path", "isabs"] {
         return;
     }
+
     check_os_pathlib_single_arg_calls(
         checker,
         call,
@@ -68,5 +70,6 @@ pub(crate) fn os_path_isabs(checker: &Checker, call: &ExprCall, segments: &[&str
         "s",
         is_fix_os_path_isabs_enabled(checker.settings()),
         OsPathIsabs,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_isdir.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_isdir_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.isdir`.
@@ -71,5 +72,6 @@ pub(crate) fn os_path_isdir(checker: &Checker, call: &ExprCall, segments: &[&str
         "s",
         is_fix_os_path_isdir_enabled(checker.settings()),
         OsPathIsdir,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_isfile.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_isfile_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.isfile`.
@@ -71,5 +72,6 @@ pub(crate) fn os_path_isfile(checker: &Checker, call: &ExprCall, segments: &[&st
         "path",
         is_fix_os_path_isfile_enabled(checker.settings()),
         OsPathIsfile,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_path_islink.rs

@@ -1,9 +1,10 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_path_islink_enabled;
 use crate::rules::flake8_use_pathlib::helpers::check_os_pathlib_single_arg_calls;
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.path.islink`.
@@ -71,5 +72,6 @@ pub(crate) fn os_path_islink(checker: &Checker, call: &ExprCall, segments: &[&st
         "path",
         is_fix_os_path_islink_enabled(checker.settings()),
         OsPathIslink,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_readlink.rs

@@ -1,11 +1,12 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::{ExprCall, PythonVersion};
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_readlink_enabled;
 use crate::rules::flake8_use_pathlib::helpers::{
     check_os_pathlib_single_arg_calls, is_keyword_only_argument_non_default,
 };
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::{ExprCall, PythonVersion};
 
 /// ## What it does
 /// Checks for uses of `os.readlink`.
@@ -87,5 +88,6 @@ pub(crate) fn os_readlink(checker: &Checker, call: &ExprCall, segments: &[&str])
         "path",
         is_fix_os_readlink_enabled(checker.settings()),
         OsReadlink,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_remove.rs

@@ -1,11 +1,12 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_remove_enabled;
 use crate::rules::flake8_use_pathlib::helpers::{
     check_os_pathlib_single_arg_calls, is_keyword_only_argument_non_default,
 };
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.remove`.
@@ -82,5 +83,6 @@ pub(crate) fn os_remove(checker: &Checker, call: &ExprCall, segments: &[&str]) {
         "path",
         is_fix_os_remove_enabled(checker.settings()),
         OsRemove,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_rmdir.rs

@@ -1,11 +1,12 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_rmdir_enabled;
 use crate::rules::flake8_use_pathlib::helpers::{
     check_os_pathlib_single_arg_calls, is_keyword_only_argument_non_default,
 };
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.rmdir`.
@@ -82,5 +83,6 @@ pub(crate) fn os_rmdir(checker: &Checker, call: &ExprCall, segments: &[&str]) {
         "path",
         is_fix_os_rmdir_enabled(checker.settings()),
         OsRmdir,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/os_unlink.rs

@@ -1,11 +1,12 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::ExprCall;
+
 use crate::checkers::ast::Checker;
 use crate::preview::is_fix_os_unlink_enabled;
 use crate::rules::flake8_use_pathlib::helpers::{
     check_os_pathlib_single_arg_calls, is_keyword_only_argument_non_default,
 };
 use crate::{FixAvailability, Violation};
-use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::ExprCall;
 
 /// ## What it does
 /// Checks for uses of `os.unlink`.
@@ -82,5 +83,6 @@ pub(crate) fn os_unlink(checker: &Checker, call: &ExprCall, segments: &[&str]) {
         "path",
         is_fix_os_unlink_enabled(checker.settings()),
         OsUnlink,
+        None,
     );
 }

crates/ruff_linter/src/rules/flake8_use_pathlib/snapshots/ruff_linter__rules__flake8_use_pathlib__tests__preview_full_name.py.snap

@@ -466,6 +466,7 @@ help: Replace with `Path(...).name`
 30 | os.path.dirname(p)
 31 | os.path.samefile(p)
 32 | os.path.splitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH120 [*] `os.path.dirname()` should be replaced by `Path.parent`
   --> full_name.py:29:1
@@ -493,6 +494,7 @@ help: Replace with `Path(...).parent`
 31 | os.path.samefile(p)
 32 | os.path.splitext(p)
 33 | with open(p) as fp:
+note: This is an unsafe fix and may change runtime behavior
 
 PTH121 `os.path.samefile()` should be replaced by `Path.samefile()`
   --> full_name.py:30:1

crates/ruff_linter/src/rules/flake8_use_pathlib/snapshots/ruff_linter__rules__flake8_use_pathlib__tests__preview_import_as.py.snap

@@ -466,6 +466,7 @@ help: Replace with `Path(...).name`
 30 | foo_p.dirname(p)
 31 | foo_p.samefile(p)
 32 | foo_p.splitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH120 [*] `os.path.dirname()` should be replaced by `Path.parent`
   --> import_as.py:29:1
@@ -492,6 +493,7 @@ help: Replace with `Path(...).parent`
 30 + pathlib.Path(p).parent
 31 | foo_p.samefile(p)
 32 | foo_p.splitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH121 `os.path.samefile()` should be replaced by `Path.samefile()`
   --> import_as.py:30:1

crates/ruff_linter/src/rules/flake8_use_pathlib/snapshots/ruff_linter__rules__flake8_use_pathlib__tests__preview_import_from.py.snap

@@ -480,6 +480,7 @@ help: Replace with `Path(...).name`
 32 | dirname(p)
 33 | samefile(p)
 34 | splitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH120 [*] `os.path.dirname()` should be replaced by `Path.parent`
   --> import_from.py:31:1
@@ -508,6 +509,7 @@ help: Replace with `Path(...).parent`
 33 | samefile(p)
 34 | splitext(p)
 35 | with open(p) as fp:
+note: This is an unsafe fix and may change runtime behavior
 
 PTH121 `os.path.samefile()` should be replaced by `Path.samefile()`
   --> import_from.py:32:1

crates/ruff_linter/src/rules/flake8_use_pathlib/snapshots/ruff_linter__rules__flake8_use_pathlib__tests__preview_import_from_as.py.snap

@@ -480,6 +480,7 @@ help: Replace with `Path(...).name`
 37 | xdirname(p)
 38 | xsamefile(p)
 39 | xsplitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH120 [*] `os.path.dirname()` should be replaced by `Path.parent`
   --> import_from_as.py:36:1
@@ -507,6 +508,7 @@ help: Replace with `Path(...).parent`
 37 + pathlib.Path(p).parent
 38 | xsamefile(p)
 39 | xsplitext(p)
+note: This is an unsafe fix and may change runtime behavior
 
 PTH121 `os.path.samefile()` should be replaced by `Path.samefile()`
   --> import_from_as.py:37:1

crates/ruff_linter/src/rules/pep8_naming/rules/invalid_first_argument_name.rs

@@ -141,7 +141,6 @@ impl Violation for InvalidFirstArgumentNameForClassMethod {
     #[derive_message_formats]
     // The first string below is what shows up in the documentation
     // in the rule table, and it is the more common case.
-    #[expect(clippy::if_not_else)]
     fn message(&self) -> String {
         if !self.is_new {
             "First argument of a class method should be named `cls`".to_string()

crates/ruff_linter/src/rules/pep8_naming/rules/mixed_case_variable_in_global_scope.rs

@@ -18,8 +18,8 @@ use crate::rules::pep8_naming::helpers;
 /// > (Let’s hope that these variables are meant for use inside one module
 /// > only.) The conventions are about the same as those for functions.
 /// >
-/// > Modules that are designed for use via from M import * should use the
-/// > __all__ mechanism to prevent exporting globals, or use the older
+/// > Modules that are designed for use via `from M import *` should use the
+/// > `__all__` mechanism to prevent exporting globals, or use the older
 /// > convention of prefixing such globals with an underscore (which you might
 /// > want to do to indicate these globals are “module non-public”).
 /// >

crates/ruff_linter/src/rules/pylint/rules/useless_import_alias.rs

@@ -47,7 +47,6 @@ impl Violation for UselessImportAlias {
 
     #[derive_message_formats]
     fn message(&self) -> String {
-        #[expect(clippy::if_not_else)]
         if !self.required_import_conflict {
             "Import alias does not rename original package".to_string()
         } else {

crates/ruff_linter/src/rules/pylint/rules/yield_from_in_async_function.rs

@@ -1,10 +1,6 @@
 use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::{self as ast};
-use ruff_python_semantic::ScopeKind;
-use ruff_text_size::Ranged;
 
 use crate::Violation;
-use crate::checkers::ast::Checker;
 
 /// ## What it does
 /// Checks for uses of `yield from` in async functions.
@@ -36,13 +32,3 @@ impl Violation for YieldFromInAsyncFunction {
         "`yield from` statement in async function; use `async for` instead".to_string()
     }
 }
-
-/// PLE1700
-pub(crate) fn yield_from_in_async_function(checker: &Checker, expr: &ast::ExprYieldFrom) {
-    if matches!(
-        checker.semantic().current_scope().kind,
-        ScopeKind::Function(ast::StmtFunctionDef { is_async: true, .. })
-    ) {
-        checker.report_diagnostic(YieldFromInAsyncFunction, expr.range());
-    }
-}

crates/ruff_linter/src/rules/pyupgrade/mod.rs

@@ -357,4 +357,19 @@ mod tests {
         2 | from pipes import quote, Template
         ");
     }
+
+    #[test]
+    fn unnecessary_default_type_args_stubs_py312_preview() -> Result<()> {
+        let snapshot = format!("{}__preview", "UP043.pyi");
+        let diagnostics = test_path(
+            Path::new("pyupgrade/UP043.pyi"),
+            &settings::LinterSettings {
+                preview: PreviewMode::Enabled,
+                unresolved_target_version: PythonVersion::PY312.into(),
+                ..settings::LinterSettings::for_rule(Rule::UnnecessaryDefaultTypeArgs)
+            },
+        )?;
+        assert_diagnostics!(snapshot, diagnostics);
+        Ok(())
+    }
 }

crates/ruff_linter/src/rules/pyupgrade/rules/format_literals.rs

@@ -164,7 +164,7 @@ fn remove_specifiers<'a>(value: &mut Expression<'a>, arena: &'a typed_arena::Are
                         stack.push(&mut string.left);
                         stack.push(&mut string.right);
                     }
-                    libcst_native::String::Formatted(_) => {}
+                    libcst_native::String::Formatted(_) | libcst_native::String::Templated(_) => {}
                 }
             }
         }

crates/ruff_linter/src/rules/pyupgrade/rules/super_call_with_parameters.rs

@@ -1,6 +1,8 @@
 use ruff_diagnostics::Applicability;
 use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::visitor::{Visitor, walk_expr, walk_stmt};
 use ruff_python_ast::{self as ast, Expr, Stmt};
+use ruff_python_semantic::SemanticModel;
 use ruff_text_size::{Ranged, TextSize};
 
 use crate::checkers::ast::Checker;
@@ -94,14 +96,22 @@ pub(crate) fn super_call_with_parameters(checker: &Checker, call: &ast::ExprCall
     };
 
     // Find the enclosing function definition (if any).
-    let Some(Stmt::FunctionDef(ast::StmtFunctionDef {
-        parameters: parent_parameters,
-        ..
-    })) = parents.find(|stmt| stmt.is_function_def_stmt())
+    let Some(
+        func_stmt @ Stmt::FunctionDef(ast::StmtFunctionDef {
+            parameters: parent_parameters,
+            ..
+        }),
+    ) = parents.find(|stmt| stmt.is_function_def_stmt())
     else {
         return;
     };
 
+    if is_builtins_super(checker.semantic(), call)
+        && !has_local_dunder_class_var_ref(checker.semantic(), func_stmt)
+    {
+        return;
+    }
+
     // Extract the name of the first argument to the enclosing function.
     let Some(parent_arg) = parent_parameters.args.first() else {
         return;
@@ -193,3 +203,67 @@ pub(crate) fn super_call_with_parameters(checker: &Checker, call: &ast::ExprCall
 fn is_super_call_with_arguments(call: &ast::ExprCall, checker: &Checker) -> bool {
     checker.semantic().match_builtin_expr(&call.func, "super") && !call.arguments.is_empty()
 }
+
+/// Returns `true` if the function contains load references to `__class__` or `super` without
+/// local binding.
+///
+/// This indicates that the function relies on the implicit `__class__` cell variable created by
+/// Python when `super()` is called without arguments, making it unsafe to remove `super()` parameters.
+fn has_local_dunder_class_var_ref(semantic: &SemanticModel, func_stmt: &Stmt) -> bool {
+    if semantic.current_scope().has("__class__") {
+        return false;
+    }
+
+    let mut finder = ClassCellReferenceFinder::new();
+    finder.visit_stmt(func_stmt);
+
+    finder.found()
+}
+
+/// Returns `true` if the call is to the built-in `builtins.super` function.
+fn is_builtins_super(semantic: &SemanticModel, call: &ast::ExprCall) -> bool {
+    semantic
+        .resolve_qualified_name(&call.func)
+        .is_some_and(|qualified_name| matches!(qualified_name.segments(), ["builtins", "super"]))
+}
+
+/// A [`Visitor`] that searches for implicit reference to `__class__` cell,
+/// excluding nested class definitions.
+#[derive(Debug)]
+struct ClassCellReferenceFinder {
+    has_class_cell: bool,
+}
+
+impl ClassCellReferenceFinder {
+    pub(crate) fn new() -> Self {
+        ClassCellReferenceFinder {
+            has_class_cell: false,
+        }
+    }
+    pub(crate) fn found(&self) -> bool {
+        self.has_class_cell
+    }
+}
+
+impl<'a> Visitor<'a> for ClassCellReferenceFinder {
+    fn visit_stmt(&mut self, stmt: &'a Stmt) {
+        match stmt {
+            Stmt::ClassDef(_) => {}
+            _ => {
+                if !self.has_class_cell {
+                    walk_stmt(self, stmt);
+                }
+            }
+        }
+    }
+
+    fn visit_expr(&mut self, expr: &'a Expr) {
+        if expr.as_name_expr().is_some_and(|name| {
+            matches!(name.id.as_str(), "super" | "__class__") && name.ctx.is_load()
+        }) {
+            self.has_class_cell = true;
+            return;
+        }
+        walk_expr(self, expr);
+    }
+}

crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs

@@ -8,6 +8,7 @@ use crate::{AlwaysFixableViolation, Applicability, Edit, Fix};
 /// ## What it does
 /// Checks for unnecessary default type arguments for `Generator` and
 /// `AsyncGenerator` on Python 3.13+.
+/// In [preview], this rule will also apply to stub files.
 ///
 /// ## Why is this bad?
 /// Python 3.13 introduced the ability for type parameters to specify default
@@ -59,6 +60,8 @@ use crate::{AlwaysFixableViolation, Applicability, Edit, Fix};
 /// - [Annotating generators and coroutines](https://docs.python.org/3/library/typing.html#annotating-generators-and-coroutines)
 /// - [Python documentation: `typing.Generator`](https://docs.python.org/3/library/typing.html#typing.Generator)
 /// - [Python documentation: `typing.AsyncGenerator`](https://docs.python.org/3/library/typing.html#typing.AsyncGenerator)
+///
+/// [preview]: https://docs.astral.sh/ruff/preview/
 #[derive(ViolationMetadata)]
 pub(crate) struct UnnecessaryDefaultTypeArgs;
 

crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP008.py.snap

@@ -146,25 +146,6 @@ help: Remove `super()` parameters
 95 | # see: https://github.com/astral-sh/ruff/issues/18684
 note: This is an unsafe fix and may change runtime behavior
 
-UP008 [*] Use `super()` instead of `super(__class__, self)`
-   --> UP008.py:107:23
-    |
-105 | class C:
-106 |     def f(self):
-107 |         builtins.super(C, self)
-    |                       ^^^^^^^^^
-    |
-help: Remove `super()` parameters
-104 | 
-105 | class C:
-106 |     def f(self):
-    -         builtins.super(C, self)
-107 +         builtins.super()
-108 | 
-109 | 
-110 | # see: https://github.com/astral-sh/ruff/issues/18533
-note: This is an unsafe fix and may change runtime behavior
-
 UP008 [*] Use `super()` instead of `super(__class__, self)`
    --> UP008.py:113:14
     |
@@ -294,6 +275,8 @@ UP008 [*] Use `super()` instead of `super(__class__, self)`
 142 |     def method3(self):
 143 |         super(ExampleWithKeywords, self).some_method()  # Should be fixed - no keywords
     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+144 |
+145 | # See: https://github.com/astral-sh/ruff/issues/19357
     |
 help: Remove `super()` parameters
 140 |         super(ExampleWithKeywords, self, **{"kwarg": "value"}).some_method()  # Should emit diagnostic but NOT be fixed
@@ -301,4 +284,213 @@ help: Remove `super()` parameters
 142 |     def method3(self):
     -         super(ExampleWithKeywords, self).some_method()  # Should be fixed - no keywords
 143 +         super().some_method()  # Should be fixed - no keywords
+144 | 
+145 | # See: https://github.com/astral-sh/ruff/issues/19357
+146 | # Must be detected
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:154:23
+    |
+152 |     def f(self):
+153 |         if False: __class__ # Python injects __class__ into scope
+154 |         builtins.super(ChildD1, self).f()
+    |                       ^^^^^^^^^^^^^^^
+155 |
+156 | class ChildD2(ParentD):
+    |
+help: Remove `super()` parameters
+151 | class ChildD1(ParentD):
+152 |     def f(self):
+153 |         if False: __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD1, self).f()
+154 +         builtins.super().f()
+155 | 
+156 | class ChildD2(ParentD):
+157 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:159:23
+    |
+157 |     def f(self):
+158 |         if False: super # Python injects __class__ into scope
+159 |         builtins.super(ChildD2, self).f()
+    |                       ^^^^^^^^^^^^^^^
+160 |
+161 | class ChildD3(ParentD):
+    |
+help: Remove `super()` parameters
+156 | class ChildD2(ParentD):
+157 |     def f(self):
+158 |         if False: super # Python injects __class__ into scope
+    -         builtins.super(ChildD2, self).f()
+159 +         builtins.super().f()
+160 | 
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:163:23
+    |
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+163 |         builtins.super(ChildD3, self).f()
+    |                       ^^^^^^^^^^^^^^^
+164 |         super # Python injects __class__ into scope
+    |
+help: Remove `super()` parameters
+160 | 
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+    -         builtins.super(ChildD3, self).f()
+163 +         builtins.super().f()
+164 |         super # Python injects __class__ into scope
+165 | 
+166 | import builtins as builtins_alias
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:169:29
+    |
+167 | class ChildD4(ParentD):
+168 |     def f(self):
+169 |         builtins_alias.super(ChildD4, self).f()
+    |                             ^^^^^^^^^^^^^^^
+170 |         super # Python injects __class__ into scope
+    |
+help: Remove `super()` parameters
+166 | import builtins as builtins_alias
+167 | class ChildD4(ParentD):
+168 |     def f(self):
+    -         builtins_alias.super(ChildD4, self).f()
+169 +         builtins_alias.super().f()
+170 |         super # Python injects __class__ into scope
+171 | 
+172 | class ChildD5(ParentD):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:176:23
+    |
+174 |         super = 1
+175 |         super # Python injects __class__ into scope
+176 |         builtins.super(ChildD5, self).f()
+    |                       ^^^^^^^^^^^^^^^
+177 |
+178 | class ChildD6(ParentD):
+    |
+help: Remove `super()` parameters
+173 |     def f(self):
+174 |         super = 1
+175 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD5, self).f()
+176 +         builtins.super().f()
+177 | 
+178 | class ChildD6(ParentD):
+179 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:182:23
+    |
+180 |         super: "Any"
+181 |         __class__ # Python injects __class__ into scope
+182 |         builtins.super(ChildD6, self).f()
+    |                       ^^^^^^^^^^^^^^^
+183 |
+184 | class ChildD7(ParentD):
+    |
+help: Remove `super()` parameters
+179 |     def f(self):
+180 |         super: "Any"
+181 |         __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD6, self).f()
+182 +         builtins.super().f()
+183 | 
+184 | class ChildD7(ParentD):
+185 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:188:23
+    |
+186 |         def x():
+187 |             __class__ # Python injects __class__ into scope
+188 |         builtins.super(ChildD7, self).f()
+    |                       ^^^^^^^^^^^^^^^
+189 |
+190 | class ChildD8(ParentD):
+    |
+help: Remove `super()` parameters
+185 |     def f(self):
+186 |         def x():
+187 |             __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD7, self).f()
+188 +         builtins.super().f()
+189 | 
+190 | class ChildD8(ParentD):
+191 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:195:23
+    |
+193 |             super = 1
+194 |         super # Python injects __class__ into scope
+195 |         builtins.super(ChildD8, self).f()
+    |                       ^^^^^^^^^^^^^^^
+196 |
+197 | class ChildD9(ParentD):
+    |
+help: Remove `super()` parameters
+192 |         def x():
+193 |             super = 1
+194 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD8, self).f()
+195 +         builtins.super().f()
+196 | 
+197 | class ChildD9(ParentD):
+198 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:202:23
+    |
+200 |             __class__ = 1
+201 |         __class__ # Python injects __class__ into scope
+202 |         builtins.super(ChildD9, self).f()
+    |                       ^^^^^^^^^^^^^^^
+203 |
+204 | class ChildD10(ParentD):
+    |
+help: Remove `super()` parameters
+199 |         def x():
+200 |             __class__ = 1
+201 |         __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD9, self).f()
+202 +         builtins.super().f()
+203 | 
+204 | class ChildD10(ParentD):
+205 |     def f(self):
+note: This is an unsafe fix and may change runtime behavior
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:209:23
+    |
+207 |             __class__ = 1
+208 |         super # Python injects __class__ into scope
+209 |         builtins.super(ChildD10, self).f()
+    |                       ^^^^^^^^^^^^^^^^
+    |
+help: Remove `super()` parameters
+206 |         def x():
+207 |             __class__ = 1
+208 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD10, self).f()
+209 +         builtins.super().f()
+210 | 
+211 | 
+212 | # Must be ignored
 note: This is an unsafe fix and may change runtime behavior

crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP008.py__preview.snap

@@ -139,24 +139,6 @@ help: Remove `super()` parameters
 94 | 
 95 | # see: https://github.com/astral-sh/ruff/issues/18684
 
-UP008 [*] Use `super()` instead of `super(__class__, self)`
-   --> UP008.py:107:23
-    |
-105 | class C:
-106 |     def f(self):
-107 |         builtins.super(C, self)
-    |                       ^^^^^^^^^
-    |
-help: Remove `super()` parameters
-104 | 
-105 | class C:
-106 |     def f(self):
-    -         builtins.super(C, self)
-107 +         builtins.super()
-108 | 
-109 | 
-110 | # see: https://github.com/astral-sh/ruff/issues/18533
-
 UP008 [*] Use `super()` instead of `super(__class__, self)`
    --> UP008.py:113:14
     |
@@ -286,6 +268,8 @@ UP008 [*] Use `super()` instead of `super(__class__, self)`
 142 |     def method3(self):
 143 |         super(ExampleWithKeywords, self).some_method()  # Should be fixed - no keywords
     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+144 |
+145 | # See: https://github.com/astral-sh/ruff/issues/19357
     |
 help: Remove `super()` parameters
 140 |         super(ExampleWithKeywords, self, **{"kwarg": "value"}).some_method()  # Should emit diagnostic but NOT be fixed
@@ -293,3 +277,202 @@ help: Remove `super()` parameters
 142 |     def method3(self):
     -         super(ExampleWithKeywords, self).some_method()  # Should be fixed - no keywords
 143 +         super().some_method()  # Should be fixed - no keywords
+144 | 
+145 | # See: https://github.com/astral-sh/ruff/issues/19357
+146 | # Must be detected
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:154:23
+    |
+152 |     def f(self):
+153 |         if False: __class__ # Python injects __class__ into scope
+154 |         builtins.super(ChildD1, self).f()
+    |                       ^^^^^^^^^^^^^^^
+155 |
+156 | class ChildD2(ParentD):
+    |
+help: Remove `super()` parameters
+151 | class ChildD1(ParentD):
+152 |     def f(self):
+153 |         if False: __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD1, self).f()
+154 +         builtins.super().f()
+155 | 
+156 | class ChildD2(ParentD):
+157 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:159:23
+    |
+157 |     def f(self):
+158 |         if False: super # Python injects __class__ into scope
+159 |         builtins.super(ChildD2, self).f()
+    |                       ^^^^^^^^^^^^^^^
+160 |
+161 | class ChildD3(ParentD):
+    |
+help: Remove `super()` parameters
+156 | class ChildD2(ParentD):
+157 |     def f(self):
+158 |         if False: super # Python injects __class__ into scope
+    -         builtins.super(ChildD2, self).f()
+159 +         builtins.super().f()
+160 | 
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:163:23
+    |
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+163 |         builtins.super(ChildD3, self).f()
+    |                       ^^^^^^^^^^^^^^^
+164 |         super # Python injects __class__ into scope
+    |
+help: Remove `super()` parameters
+160 | 
+161 | class ChildD3(ParentD):
+162 |     def f(self):
+    -         builtins.super(ChildD3, self).f()
+163 +         builtins.super().f()
+164 |         super # Python injects __class__ into scope
+165 | 
+166 | import builtins as builtins_alias
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:169:29
+    |
+167 | class ChildD4(ParentD):
+168 |     def f(self):
+169 |         builtins_alias.super(ChildD4, self).f()
+    |                             ^^^^^^^^^^^^^^^
+170 |         super # Python injects __class__ into scope
+    |
+help: Remove `super()` parameters
+166 | import builtins as builtins_alias
+167 | class ChildD4(ParentD):
+168 |     def f(self):
+    -         builtins_alias.super(ChildD4, self).f()
+169 +         builtins_alias.super().f()
+170 |         super # Python injects __class__ into scope
+171 | 
+172 | class ChildD5(ParentD):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:176:23
+    |
+174 |         super = 1
+175 |         super # Python injects __class__ into scope
+176 |         builtins.super(ChildD5, self).f()
+    |                       ^^^^^^^^^^^^^^^
+177 |
+178 | class ChildD6(ParentD):
+    |
+help: Remove `super()` parameters
+173 |     def f(self):
+174 |         super = 1
+175 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD5, self).f()
+176 +         builtins.super().f()
+177 | 
+178 | class ChildD6(ParentD):
+179 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:182:23
+    |
+180 |         super: "Any"
+181 |         __class__ # Python injects __class__ into scope
+182 |         builtins.super(ChildD6, self).f()
+    |                       ^^^^^^^^^^^^^^^
+183 |
+184 | class ChildD7(ParentD):
+    |
+help: Remove `super()` parameters
+179 |     def f(self):
+180 |         super: "Any"
+181 |         __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD6, self).f()
+182 +         builtins.super().f()
+183 | 
+184 | class ChildD7(ParentD):
+185 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:188:23
+    |
+186 |         def x():
+187 |             __class__ # Python injects __class__ into scope
+188 |         builtins.super(ChildD7, self).f()
+    |                       ^^^^^^^^^^^^^^^
+189 |
+190 | class ChildD8(ParentD):
+    |
+help: Remove `super()` parameters
+185 |     def f(self):
+186 |         def x():
+187 |             __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD7, self).f()
+188 +         builtins.super().f()
+189 | 
+190 | class ChildD8(ParentD):
+191 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:195:23
+    |
+193 |             super = 1
+194 |         super # Python injects __class__ into scope
+195 |         builtins.super(ChildD8, self).f()
+    |                       ^^^^^^^^^^^^^^^
+196 |
+197 | class ChildD9(ParentD):
+    |
+help: Remove `super()` parameters
+192 |         def x():
+193 |             super = 1
+194 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD8, self).f()
+195 +         builtins.super().f()
+196 | 
+197 | class ChildD9(ParentD):
+198 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:202:23
+    |
+200 |             __class__ = 1
+201 |         __class__ # Python injects __class__ into scope
+202 |         builtins.super(ChildD9, self).f()
+    |                       ^^^^^^^^^^^^^^^
+203 |
+204 | class ChildD10(ParentD):
+    |
+help: Remove `super()` parameters
+199 |         def x():
+200 |             __class__ = 1
+201 |         __class__ # Python injects __class__ into scope
+    -         builtins.super(ChildD9, self).f()
+202 +         builtins.super().f()
+203 | 
+204 | class ChildD10(ParentD):
+205 |     def f(self):
+
+UP008 [*] Use `super()` instead of `super(__class__, self)`
+   --> UP008.py:209:23
+    |
+207 |             __class__ = 1
+208 |         super # Python injects __class__ into scope
+209 |         builtins.super(ChildD10, self).f()
+    |                       ^^^^^^^^^^^^^^^^
+    |
+help: Remove `super()` parameters
+206 |         def x():
+207 |             __class__ = 1
+208 |         super # Python injects __class__ into scope
+    -         builtins.super(ChildD10, self).f()
+209 +         builtins.super().f()
+210 | 
+211 | 
+212 | # Must be ignored

crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.pyi__preview.snap

@@ -0,0 +1,128 @@
+---
+source: crates/ruff_linter/src/rules/pyupgrade/mod.rs
+---
+UP043 [*] Unnecessary default type arguments
+ --> UP043.pyi:4:15
+  |
+4 | def func() -> Generator[int, None, None]:
+  |               ^^^^^^^^^^^^^^^^^^^^^^^^^^
+5 |     yield 42
+  |
+help: Remove default type arguments
+1 | from collections.abc import Generator, AsyncGenerator
+2 | 
+3 | 
+  - def func() -> Generator[int, None, None]:
+4 + def func() -> Generator[int]:
+5 |     yield 42
+6 | 
+7 | 
+
+UP043 [*] Unnecessary default type arguments
+ --> UP043.pyi:8:15
+  |
+8 | def func() -> Generator[int, None]:
+  |               ^^^^^^^^^^^^^^^^^^^^
+9 |     yield 42
+  |
+help: Remove default type arguments
+5  |     yield 42
+6  | 
+7  | 
+   - def func() -> Generator[int, None]:
+8  + def func() -> Generator[int]:
+9  |     yield 42
+10 | 
+11 | 
+
+UP043 [*] Unnecessary default type arguments
+  --> UP043.pyi:21:15
+   |
+21 | def func() -> Generator[int, int, None]:
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^
+22 |     _ = yield 42
+23 |     return None
+   |
+help: Remove default type arguments
+18 |     return foo
+19 | 
+20 | 
+   - def func() -> Generator[int, int, None]:
+21 + def func() -> Generator[int, int]:
+22 |     _ = yield 42
+23 |     return None
+24 | 
+
+UP043 [*] Unnecessary default type arguments
+  --> UP043.pyi:31:21
+   |
+31 | async def func() -> AsyncGenerator[int, None]:
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
+32 |     yield 42
+   |
+help: Remove default type arguments
+28 |     return 42
+29 | 
+30 | 
+   - async def func() -> AsyncGenerator[int, None]:
+31 + async def func() -> AsyncGenerator[int]:
+32 |     yield 42
+33 | 
+34 | 
+
+UP043 [*] Unnecessary default type arguments
+  --> UP043.pyi:47:15
+   |
+47 | def func() -> Generator[str, None, None]:
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^
+48 |     yield "hello"
+   |
+help: Remove default type arguments
+44 | from typing import Generator, AsyncGenerator
+45 | 
+46 | 
+   - def func() -> Generator[str, None, None]:
+47 + def func() -> Generator[str]:
+48 |     yield "hello"
+49 | 
+50 | 
+
+UP043 [*] Unnecessary default type arguments
+  --> UP043.pyi:51:21
+   |
+51 | async def func() -> AsyncGenerator[str, None]:
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
+52 |     yield "hello"
+   |
+help: Remove default type arguments
+48 |     yield "hello"
+49 | 
+50 | 
+   - async def func() -> AsyncGenerator[str, None]:
+51 + async def func() -> AsyncGenerator[str]:
+52 |     yield "hello"
+53 | 
+54 | 
+
+UP043 [*] Unnecessary default type arguments
+  --> UP043.pyi:55:21
+   |
+55 |   async def func() -> AsyncGenerator[  # type: ignore
+   |  _____________________^
+56 | |     str,
+57 | |     None
+58 | | ]:
+   | |_^
+59 |       yield "hello"
+   |
+help: Remove default type arguments
+52 |     yield "hello"
+53 | 
+54 | 
+   - async def func() -> AsyncGenerator[  # type: ignore
+   -     str,
+   -     None
+   - ]:
+55 + async def func() -> AsyncGenerator[str]:
+56 |     yield "hello"
+note: This is an unsafe fix and may change runtime behavior

crates/ruff_linter/src/rules/ruff/rules/in_empty_collection.rs

@@ -1,5 +1,5 @@
 use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::{self as ast, CmpOp, Expr};
+use ruff_python_ast::{self as ast, CmpOp, Expr, helpers::is_empty_f_string};
 use ruff_python_semantic::SemanticModel;
 use ruff_text_size::Ranged;
 
@@ -75,10 +75,7 @@ fn is_empty(expr: &Expr, semantic: &SemanticModel) -> bool {
         Expr::Dict(ast::ExprDict { items, .. }) => items.is_empty(),
         Expr::BytesLiteral(ast::ExprBytesLiteral { value, .. }) => value.is_empty(),
         Expr::StringLiteral(ast::ExprStringLiteral { value, .. }) => value.is_empty(),
-        Expr::FString(s) => s
-            .value
-            .elements()
-            .all(|elt| elt.as_literal().is_some_and(|elt| elt.is_empty())),
+        Expr::FString(s) => is_empty_f_string(s),
         Expr::Call(ast::ExprCall {
             func,
             arguments,

crates/ruff_linter/src/rules/ruff/snapshots/ruff_linter__rules__ruff__tests__RUF060_RUF060.py.snap

@@ -251,3 +251,12 @@ RUF060 Unnecessary membership test on empty collection
 25 |
 26 | # OK
    |
+
+RUF060 Unnecessary membership test on empty collection
+  --> RUF060.py:47:1
+   |
+46 | # https://github.com/astral-sh/ruff/issues/20238
+47 | "b" in f"" "" # Error
+   | ^^^^^^^^^^^^^
+48 | "b" in f"" "x" # OK
+   |

crates/ruff_linter/src/snapshots/ruff_linter__linter__tests__yield_from_in_async_function.py.snap

@@ -0,0 +1,9 @@
+---
+source: crates/ruff_linter/src/linter.rs
+---
+PLE1700 `yield from` statement in async function; use `async for` instead
+ --> resources/test/fixtures/syntax_errors/yield_from_in_async_function.py:1:16
+  |
+1 | async def f(): yield from x # error
+  |                ^^^^^^^^^^^^
+  |

crates/ruff_python_ast/src/nodes.rs

@@ -3030,6 +3030,12 @@ impl Parameters {
             .find(|arg| arg.parameter.name.as_str() == name)
     }
 
+    /// Returns the index of the parameter with the given name
+    pub fn index(&self, name: &str) -> Option<usize> {
+        self.iter_non_variadic_params()
+            .position(|arg| arg.parameter.name.as_str() == name)
+    }
+
     /// Returns an iterator over all parameters included in this [`Parameters`] node.
     pub fn iter(&self) -> ParametersIterator<'_> {
         ParametersIterator::new(self)
@@ -3219,7 +3225,6 @@ impl<'a> IntoIterator for &'a Box<Parameters> {
 /// Used by `Arguments` original type.
 ///
 /// NOTE: This type is different from original Python AST.
-
 #[derive(Clone, Debug, PartialEq)]
 #[cfg_attr(feature = "get-size", derive(get_size2::GetSize))]
 pub struct ParameterWithDefault {
@@ -3241,6 +3246,14 @@ impl ParameterWithDefault {
     pub fn annotation(&self) -> Option<&Expr> {
         self.parameter.annotation()
     }
+
+    /// Return `true` if the parameter name uses the pre-PEP-570 convention
+    /// (specified in PEP 484) to indicate to a type checker that it should be treated
+    /// as positional-only.
+    pub fn uses_pep_484_positional_only_convention(&self) -> bool {
+        let name = self.name();
+        name.starts_with("__") && !name.ends_with("__")
+    }
 }
 
 /// An AST node used to represent the arguments passed to a function call or class definition.

crates/ruff_python_codegen/src/lib.rs

@@ -1,6 +1,6 @@
 pub use generator::Generator;
 use ruff_python_parser::{ParseError, parse_module};
-pub use stylist::Stylist;
+pub use stylist::{Indentation, Stylist};
 
 mod generator;
 mod stylist;

crates/ruff_python_formatter/src/options.rs

@@ -252,15 +252,20 @@ impl QuoteStyle {
     pub const fn is_preserve(self) -> bool {
         matches!(self, QuoteStyle::Preserve)
     }
+
+    /// Returns the string representation of the quote style.
+    pub const fn as_str(&self) -> &'static str {
+        match self {
+            QuoteStyle::Single => "single",
+            QuoteStyle::Double => "double",
+            QuoteStyle::Preserve => "preserve",
+        }
+    }
 }
 
 impl fmt::Display for QuoteStyle {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Single => write!(f, "single"),
-            Self::Double => write!(f, "double"),
-            Self::Preserve => write!(f, "preserve"),
-        }
+        f.write_str(self.as_str())
     }
 }
 
@@ -302,10 +307,10 @@ impl MagicTrailingComma {
 
 impl fmt::Display for MagicTrailingComma {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Respect => write!(f, "respect"),
-            Self::Ignore => write!(f, "ignore"),
-        }
+        f.write_str(match self {
+            MagicTrailingComma::Respect => "respect",
+            MagicTrailingComma::Ignore => "ignore",
+        })
     }
 }
 

crates/ruff_python_parser/resources/inline/err/yield_from_in_async_function.py

@@ -0,0 +1 @@
+async def f(): yield from x

crates/ruff_python_parser/src/semantic_errors.rs

@@ -709,6 +709,16 @@ impl SemanticSyntaxChecker {
             }
             Expr::YieldFrom(_) => {
                 Self::yield_outside_function(ctx, expr, YieldOutsideFunctionKind::YieldFrom);
+                if ctx.in_function_scope() && ctx.in_async_context() {
+                    // test_err yield_from_in_async_function
+                    // async def f(): yield from x
+
+                    Self::add_error(
+                        ctx,
+                        SemanticSyntaxErrorKind::YieldFromInAsyncFunction,
+                        expr.range(),
+                    );
+                }
             }
             Expr::Await(_) => {
                 Self::yield_outside_function(ctx, expr, YieldOutsideFunctionKind::Await);
@@ -989,6 +999,9 @@ impl Display for SemanticSyntaxError {
             SemanticSyntaxErrorKind::AnnotatedNonlocal(name) => {
                 write!(f, "annotated name `{name}` can't be nonlocal")
             }
+            SemanticSyntaxErrorKind::YieldFromInAsyncFunction => {
+                f.write_str("`yield from` statement in async function; use `async for` instead")
+            }
         }
     }
 }
@@ -1346,6 +1359,9 @@ pub enum SemanticSyntaxErrorKind {
 
     /// Represents a type annotation on a variable that's been declared nonlocal
     AnnotatedNonlocal(String),
+
+    /// Represents the use of `yield from` inside an asynchronous function.
+    YieldFromInAsyncFunction,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, get_size2::GetSize)]

crates/ruff_python_parser/tests/fixtures.rs

@@ -465,7 +465,7 @@ impl<'ast> SourceOrderVisitor<'ast> for ValidateAstVisitor<'ast> {
 
 enum Scope {
     Module,
-    Function,
+    Function { is_async: bool },
     Comprehension { is_async: bool },
     Class,
 }
@@ -528,7 +528,15 @@ impl SemanticSyntaxContext for SemanticSyntaxCheckerVisitor<'_> {
     }
 
     fn in_async_context(&self) -> bool {
-        true
+        if let Some(scope) = self.scopes.iter().next_back() {
+            match scope {
+                Scope::Class | Scope::Module => false,
+                Scope::Comprehension { is_async } => *is_async,
+                Scope::Function { is_async } => *is_async,
+            }
+        } else {
+            false
+        }
     }
 
     fn in_sync_comprehension(&self) -> bool {
@@ -589,8 +597,10 @@ impl Visitor<'_> for SemanticSyntaxCheckerVisitor<'_> {
                 self.visit_body(body);
                 self.scopes.pop().unwrap();
             }
-            ast::Stmt::FunctionDef(ast::StmtFunctionDef { .. }) => {
-                self.scopes.push(Scope::Function);
+            ast::Stmt::FunctionDef(ast::StmtFunctionDef { is_async, .. }) => {
+                self.scopes.push(Scope::Function {
+                    is_async: *is_async,
+                });
                 ast::visitor::walk_stmt(self, stmt);
                 self.scopes.pop().unwrap();
             }
@@ -604,7 +614,7 @@ impl Visitor<'_> for SemanticSyntaxCheckerVisitor<'_> {
         self.with_semantic_checker(|semantic, context| semantic.visit_expr(expr, context));
         match expr {
             ast::Expr::Lambda(_) => {
-                self.scopes.push(Scope::Function);
+                self.scopes.push(Scope::Function { is_async: false });
                 ast::visitor::walk_expr(self, expr);
                 self.scopes.pop().unwrap();
             }

crates/ruff_python_parser/tests/snapshots/invalid_syntax@yield_from_in_async_function.py.snap

@@ -0,0 +1,68 @@
+---
+source: crates/ruff_python_parser/tests/fixtures.rs
+input_file: crates/ruff_python_parser/resources/inline/err/yield_from_in_async_function.py
+---
+## AST
+
+```
+Module(
+    ModModule {
+        node_index: NodeIndex(None),
+        range: 0..28,
+        body: [
+            FunctionDef(
+                StmtFunctionDef {
+                    node_index: NodeIndex(None),
+                    range: 0..27,
+                    is_async: true,
+                    decorator_list: [],
+                    name: Identifier {
+                        id: Name("f"),
+                        range: 10..11,
+                        node_index: NodeIndex(None),
+                    },
+                    type_params: None,
+                    parameters: Parameters {
+                        range: 11..13,
+                        node_index: NodeIndex(None),
+                        posonlyargs: [],
+                        args: [],
+                        vararg: None,
+                        kwonlyargs: [],
+                        kwarg: None,
+                    },
+                    returns: None,
+                    body: [
+                        Expr(
+                            StmtExpr {
+                                node_index: NodeIndex(None),
+                                range: 15..27,
+                                value: YieldFrom(
+                                    ExprYieldFrom {
+                                        node_index: NodeIndex(None),
+                                        range: 15..27,
+                                        value: Name(
+                                            ExprName {
+                                                node_index: NodeIndex(None),
+                                                range: 26..27,
+                                                id: Name("x"),
+                                                ctx: Load,
+                                            },
+                                        ),
+                                    },
+                                ),
+                            },
+                        ),
+                    ],
+                },
+            ),
+        ],
+    },
+)
+```
+## Semantic Syntax Errors
+
+  |
+1 | async def f(): yield from x
+  |                ^^^^^^^^^^^^ Syntax Error: `yield from` statement in async function; use `async for` instead
+  |

crates/ruff_server/Cargo.toml

@@ -50,5 +50,8 @@ insta = { workspace = true }
 [target.'cfg(target_vendor = "apple")'.dependencies]
 libc = { workspace = true }
 
+[features]
+test-uv = []
+
 [lints]
 workspace = true

crates/ruff_server/src/format.rs

@@ -1,18 +1,52 @@
+use std::io::Write;
 use std::path::Path;
+use std::process::{Command, Stdio};
 
-use ruff_formatter::PrintedRange;
+use anyhow::Context;
+
+use ruff_formatter::{FormatOptions, PrintedRange};
 use ruff_python_ast::PySourceType;
-use ruff_python_formatter::{FormatModuleError, format_module_source};
+use ruff_python_formatter::{FormatModuleError, PyFormatOptions, format_module_source};
+use ruff_source_file::LineIndex;
 use ruff_text_size::TextRange;
 use ruff_workspace::FormatterSettings;
 
 use crate::edit::TextDocument;
 
+/// The backend to use for formatting.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, serde::Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub(crate) enum FormatBackend {
+    /// Use the built-in Ruff formatter.
+    ///
+    /// The formatter version will match the LSP version.
+    #[default]
+    Internal,
+    /// Use uv for formatting.
+    ///
+    /// The formatter version may differ from the LSP version.
+    Uv,
+}
+
 pub(crate) fn format(
     document: &TextDocument,
     source_type: PySourceType,
     formatter_settings: &FormatterSettings,
     path: &Path,
+    backend: FormatBackend,
+) -> crate::Result<Option<String>> {
+    match backend {
+        FormatBackend::Uv => format_external(document, source_type, formatter_settings, path),
+        FormatBackend::Internal => format_internal(document, source_type, formatter_settings, path),
+    }
+}
+
+/// Format using the built-in Ruff formatter.
+fn format_internal(
+    document: &TextDocument,
+    source_type: PySourceType,
+    formatter_settings: &FormatterSettings,
+    path: &Path,
 ) -> crate::Result<Option<String>> {
     let format_options =
         formatter_settings.to_format_options(source_type, document.contents(), Some(path));
@@ -35,12 +69,44 @@ pub(crate) fn format(
     }
 }
 
+/// Format using an external uv command.
+fn format_external(
+    document: &TextDocument,
+    source_type: PySourceType,
+    formatter_settings: &FormatterSettings,
+    path: &Path,
+) -> crate::Result<Option<String>> {
+    let format_options =
+        formatter_settings.to_format_options(source_type, document.contents(), Some(path));
+    let uv_command = UvFormatCommand::from(format_options);
+    uv_command.format_document(document.contents(), path)
+}
+
 pub(crate) fn format_range(
     document: &TextDocument,
     source_type: PySourceType,
     formatter_settings: &FormatterSettings,
     range: TextRange,
     path: &Path,
+    backend: FormatBackend,
+) -> crate::Result<Option<PrintedRange>> {
+    match backend {
+        FormatBackend::Uv => {
+            format_range_external(document, source_type, formatter_settings, range, path)
+        }
+        FormatBackend::Internal => {
+            format_range_internal(document, source_type, formatter_settings, range, path)
+        }
+    }
+}
+
+/// Format range using the built-in Ruff formatter
+fn format_range_internal(
+    document: &TextDocument,
+    source_type: PySourceType,
+    formatter_settings: &FormatterSettings,
+    range: TextRange,
+    path: &Path,
 ) -> crate::Result<Option<PrintedRange>> {
     let format_options =
         formatter_settings.to_format_options(source_type, document.contents(), Some(path));
@@ -63,6 +129,198 @@ pub(crate) fn format_range(
     }
 }
 
+/// Format range using an external command, i.e., `uv`.
+fn format_range_external(
+    document: &TextDocument,
+    source_type: PySourceType,
+    formatter_settings: &FormatterSettings,
+    range: TextRange,
+    path: &Path,
+) -> crate::Result<Option<PrintedRange>> {
+    let format_options =
+        formatter_settings.to_format_options(source_type, document.contents(), Some(path));
+    let uv_command = UvFormatCommand::from(format_options);
+
+    // Format the range using uv and convert the result to `PrintedRange`
+    match uv_command.format_range(document.contents(), range, path, document.index())? {
+        Some(formatted) => Ok(Some(PrintedRange::new(formatted, range))),
+        None => Ok(None),
+    }
+}
+
+/// Builder for uv format commands
+#[derive(Debug)]
+pub(crate) struct UvFormatCommand {
+    options: PyFormatOptions,
+}
+
+impl From<PyFormatOptions> for UvFormatCommand {
+    fn from(options: PyFormatOptions) -> Self {
+        Self { options }
+    }
+}
+
+impl UvFormatCommand {
+    /// Build the command with all necessary arguments
+    fn build_command(
+        &self,
+        path: &Path,
+        range_with_index: Option<(TextRange, &LineIndex, &str)>,
+    ) -> Command {
+        let mut command = Command::new("uv");
+        command.arg("format");
+        command.arg("--");
+
+        let target_version = format!(
+            "py{}{}",
+            self.options.target_version().major,
+            self.options.target_version().minor
+        );
+
+        // Add only the formatting options that the CLI supports
+        command.arg("--target-version");
+        command.arg(&target_version);
+
+        command.arg("--line-length");
+        command.arg(self.options.line_width().to_string());
+
+        if self.options.preview().is_enabled() {
+            command.arg("--preview");
+        }
+
+        // Pass other formatting options via --config
+        command.arg("--config");
+        command.arg(format!(
+            "format.indent-style = '{}'",
+            self.options.indent_style()
+        ));
+
+        command.arg("--config");
+        command.arg(format!("indent-width = {}", self.options.indent_width()));
+
+        command.arg("--config");
+        command.arg(format!(
+            "format.quote-style = '{}'",
+            self.options.quote_style()
+        ));
+
+        command.arg("--config");
+        command.arg(format!(
+            "format.line-ending = '{}'",
+            self.options.line_ending().as_setting_str()
+        ));
+
+        command.arg("--config");
+        command.arg(format!(
+            "format.skip-magic-trailing-comma = {}",
+            match self.options.magic_trailing_comma() {
+                ruff_python_formatter::MagicTrailingComma::Respect => "false",
+                ruff_python_formatter::MagicTrailingComma::Ignore => "true",
+            }
+        ));
+
+        if let Some((range, line_index, source)) = range_with_index {
+            // The CLI expects line:column format
+            let start_pos = line_index.line_column(range.start(), source);
+            let end_pos = line_index.line_column(range.end(), source);
+            let range_str = format!(
+                "{}:{}-{}:{}",
+                start_pos.line.get(),
+                start_pos.column.get(),
+                end_pos.line.get(),
+                end_pos.column.get()
+            );
+            command.arg("--range");
+            command.arg(&range_str);
+        }
+
+        command.arg("--stdin-filename");
+        command.arg(path.to_string_lossy().as_ref());
+
+        command.stdin(Stdio::piped());
+        command.stdout(Stdio::piped());
+        command.stderr(Stdio::piped());
+
+        command
+    }
+
+    /// Execute the format command on the given source.
+    pub(crate) fn format(
+        &self,
+        source: &str,
+        path: &Path,
+        range_with_index: Option<(TextRange, &LineIndex)>,
+    ) -> crate::Result<Option<String>> {
+        let mut command =
+            self.build_command(path, range_with_index.map(|(r, idx)| (r, idx, source)));
+        let mut child = match command.spawn() {
+            Ok(child) => child,
+            Err(err) if err.kind() == std::io::ErrorKind::NotFound => {
+                anyhow::bail!("uv was not found; is it installed and on the PATH?")
+            }
+            Err(err) => return Err(err).context("Failed to spawn uv"),
+        };
+
+        let mut stdin = child
+            .stdin
+            .take()
+            .context("Failed to get stdin from format subprocess")?;
+        stdin
+            .write_all(source.as_bytes())
+            .context("Failed to write to stdin")?;
+        drop(stdin);
+
+        let result = child
+            .wait_with_output()
+            .context("Failed to get output from format subprocess")?;
+
+        if !result.status.success() {
+            let stderr = String::from_utf8_lossy(&result.stderr);
+            // We don't propagate format errors due to invalid syntax
+            if stderr.contains("Failed to parse") {
+                tracing::warn!("Unable to format document: {}", stderr);
+                return Ok(None);
+            }
+            // Special-case for when `uv format` is not available
+            if stderr.contains("unrecognized subcommand 'format'") {
+                anyhow::bail!(
+                    "The installed version of uv does not support `uv format`; upgrade to a newer version"
+                );
+            }
+            anyhow::bail!("Failed to format document: {}", stderr);
+        }
+
+        let formatted = String::from_utf8(result.stdout)
+            .context("Failed to parse stdout from format subprocess as utf-8")?;
+
+        if formatted == source {
+            Ok(None)
+        } else {
+            Ok(Some(formatted))
+        }
+    }
+
+    /// Format the entire document.
+    pub(crate) fn format_document(
+        &self,
+        source: &str,
+        path: &Path,
+    ) -> crate::Result<Option<String>> {
+        self.format(source, path, None)
+    }
+
+    /// Format a specific range.
+    pub(crate) fn format_range(
+        &self,
+        source: &str,
+        range: TextRange,
+        path: &Path,
+        line_index: &LineIndex,
+    ) -> crate::Result<Option<String>> {
+        self.format(source, path, Some((range, line_index)))
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::path::Path;
@@ -74,7 +332,7 @@ mod tests {
     use ruff_workspace::FormatterSettings;
 
     use crate::TextDocument;
-    use crate::format::{format, format_range};
+    use crate::format::{FormatBackend, format, format_range};
 
     #[test]
     fn format_per_file_version() {
@@ -98,6 +356,7 @@ with open("a_really_long_foo") as foo, open("a_really_long_bar") as bar, open("a
                 ..Default::default()
             },
             Path::new("test.py"),
+            FormatBackend::Internal,
         )
         .expect("Expected no errors when formatting")
         .expect("Expected formatting changes");
@@ -120,6 +379,7 @@ with open("a_really_long_foo") as foo, open("a_really_long_bar") as bar, open("a
                 ..Default::default()
             },
             Path::new("test.py"),
+            FormatBackend::Internal,
         )
         .expect("Expected no errors when formatting")
         .expect("Expected formatting changes");
@@ -168,6 +428,7 @@ sys.exit(
             },
             range,
             Path::new("test.py"),
+            FormatBackend::Internal,
         )
         .expect("Expected no errors when formatting")
         .expect("Expected formatting changes");
@@ -191,6 +452,7 @@ sys.exit(
             },
             range,
             Path::new("test.py"),
+            FormatBackend::Internal,
         )
         .expect("Expected no errors when formatting")
         .expect("Expected formatting changes");
@@ -204,4 +466,279 @@ sys.exit(
 
         Ok(())
     }
+
+    #[cfg(feature = "test-uv")]
+    mod uv_tests {
+        use super::*;
+
+        #[test]
+        fn test_uv_format_document() {
+            let document = TextDocument::new(
+                r#"
+def hello(  x,y ,z  ):
+    return x+y  +z
+
+
+def world(  ):
+    pass
+"#
+                .to_string(),
+                0,
+            );
+
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &FormatterSettings::default(),
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting with uv")
+            .expect("Expected formatting changes");
+
+            // uv should format this to a consistent style
+            assert_snapshot!(result, @r#"
+            def hello(x, y, z):
+                return x + y + z
+
+
+            def world():
+                pass
+            "#);
+        }
+
+        #[test]
+        fn test_uv_format_range() -> anyhow::Result<()> {
+            let document = TextDocument::new(
+                r#"
+def messy_function(  a,  b,c   ):
+    return a+b+c
+
+def another_function(x,y,z):
+    result=x+y+z
+    return result
+"#
+                .to_string(),
+                0,
+            );
+
+            // Find the range of the second function
+            let start = document.contents().find("def another_function").unwrap();
+            let end = document.contents().find("return result").unwrap() + "return result".len();
+            let range = TextRange::new(TextSize::try_from(start)?, TextSize::try_from(end)?);
+
+            let result = format_range(
+                &document,
+                PySourceType::Python,
+                &FormatterSettings::default(),
+                range,
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting range with uv")
+            .expect("Expected formatting changes");
+
+            assert_snapshot!(result.as_code(), @r#"
+            def messy_function(  a,  b,c   ):
+                return a+b+c
+
+            def another_function(x, y, z):
+                result = x + y + z
+                return result
+            "#);
+
+            Ok(())
+        }
+
+        #[test]
+        fn test_uv_format_with_line_length() {
+            use ruff_formatter::LineWidth;
+
+            let document = TextDocument::new(
+                r#"
+def hello(very_long_parameter_name_1, very_long_parameter_name_2, very_long_parameter_name_3):
+    return very_long_parameter_name_1 + very_long_parameter_name_2 + very_long_parameter_name_3
+"#
+                .to_string(),
+                0,
+            );
+
+            // Test with shorter line length
+            let formatter_settings = FormatterSettings {
+                line_width: LineWidth::try_from(60).unwrap(),
+                ..Default::default()
+            };
+
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &formatter_settings,
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting with uv")
+            .expect("Expected formatting changes");
+
+            // With line length 60, the function should be wrapped
+            assert_snapshot!(result, @r#"
+            def hello(
+                very_long_parameter_name_1,
+                very_long_parameter_name_2,
+                very_long_parameter_name_3,
+            ):
+                return (
+                    very_long_parameter_name_1
+                    + very_long_parameter_name_2
+                    + very_long_parameter_name_3
+                )
+            "#);
+        }
+
+        #[test]
+        fn test_uv_format_with_indent_style() {
+            use ruff_formatter::IndentStyle;
+
+            let document = TextDocument::new(
+                r#"
+def hello():
+    if True:
+        print("Hello")
+        if False:
+            print("World")
+"#
+                .to_string(),
+                0,
+            );
+
+            // Test with tabs instead of spaces
+            let formatter_settings = FormatterSettings {
+                indent_style: IndentStyle::Tab,
+                ..Default::default()
+            };
+
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &formatter_settings,
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting with uv")
+            .expect("Expected formatting changes");
+
+            // Should have formatting changes (spaces to tabs)
+            assert_snapshot!(result, @r#"
+            def hello():
+            	if True:
+            		print("Hello")
+            		if False:
+            			print("World")
+            "#);
+        }
+
+        #[test]
+        fn test_uv_format_syntax_error() {
+            let document = TextDocument::new(
+                r#"
+def broken(:
+    pass
+"#
+                .to_string(),
+                0,
+            );
+
+            // uv should return None for syntax errors (as indicated by the TODO comment)
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &FormatterSettings::default(),
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors from format function");
+
+            // Should return None since the syntax is invalid
+            assert_eq!(result, None, "Expected None for syntax error");
+        }
+
+        #[test]
+        fn test_uv_format_with_quote_style() {
+            use ruff_python_formatter::QuoteStyle;
+
+            let document = TextDocument::new(
+                r#"
+x = "hello"
+y = 'world'
+z = '''multi
+line'''
+"#
+                .to_string(),
+                0,
+            );
+
+            // Test with single quotes
+            let formatter_settings = FormatterSettings {
+                quote_style: QuoteStyle::Single,
+                ..Default::default()
+            };
+
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &formatter_settings,
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting with uv")
+            .expect("Expected formatting changes");
+
+            assert_snapshot!(result, @r#"
+            x = 'hello'
+            y = 'world'
+            z = """multi
+            line"""
+            "#);
+        }
+
+        #[test]
+        fn test_uv_format_with_magic_trailing_comma() {
+            use ruff_python_formatter::MagicTrailingComma;
+
+            let document = TextDocument::new(
+                r#"
+foo = [
+    1,
+    2,
+    3,
+]
+
+bar = [1, 2, 3,]
+"#
+                .to_string(),
+                0,
+            );
+
+            // Test with ignore magic trailing comma
+            let formatter_settings = FormatterSettings {
+                magic_trailing_comma: MagicTrailingComma::Ignore,
+                ..Default::default()
+            };
+
+            let result = format(
+                &document,
+                PySourceType::Python,
+                &formatter_settings,
+                Path::new("test.py"),
+                FormatBackend::Uv,
+            )
+            .expect("Expected no errors when formatting with uv")
+            .expect("Expected formatting changes");
+
+            assert_snapshot!(result, @r#"
+            foo = [1, 2, 3]
+
+            bar = [1, 2, 3]
+            "#);
+        }
+    }
 }

crates/ruff_server/src/server/api/requests/format.rs

@@ -33,6 +33,10 @@ impl super::BackgroundDocumentRequestHandler for Format {
 pub(super) fn format_full_document(snapshot: &DocumentSnapshot) -> Result<Fixes> {
     let mut fixes = Fixes::default();
     let query = snapshot.query();
+    let backend = snapshot
+        .client_settings()
+        .editor_settings()
+        .format_backend();
 
     match snapshot.query() {
         DocumentQuery::Notebook { notebook, .. } => {
@@ -41,7 +45,7 @@ pub(super) fn format_full_document(snapshot: &DocumentSnapshot) -> Result<Fixes>
                 .map(|url| (url.clone(), notebook.cell_document_by_uri(url).unwrap()))
             {
                 if let Some(changes) =
-                    format_text_document(text_document, query, snapshot.encoding(), true)?
+                    format_text_document(text_document, query, snapshot.encoding(), true, backend)?
                 {
                     fixes.insert(url, changes);
                 }
@@ -49,7 +53,7 @@ pub(super) fn format_full_document(snapshot: &DocumentSnapshot) -> Result<Fixes>
         }
         DocumentQuery::Text { document, .. } => {
             if let Some(changes) =
-                format_text_document(document, query, snapshot.encoding(), false)?
+                format_text_document(document, query, snapshot.encoding(), false, backend)?
             {
                 fixes.insert(snapshot.query().make_key().into_url(), changes);
             }
@@ -68,11 +72,16 @@ pub(super) fn format_document(snapshot: &DocumentSnapshot) -> Result<super::Form
         .context("Failed to get text document for the format request")
         .unwrap();
     let query = snapshot.query();
+    let backend = snapshot
+        .client_settings()
+        .editor_settings()
+        .format_backend();
     format_text_document(
         text_document,
         query,
         snapshot.encoding(),
         query.as_notebook().is_some(),
+        backend,
     )
 }
 
@@ -81,6 +90,7 @@ fn format_text_document(
     query: &DocumentQuery,
     encoding: PositionEncoding,
     is_notebook: bool,
+    backend: crate::format::FormatBackend,
 ) -> Result<super::FormatResponse> {
     let settings = query.settings();
     let file_path = query.virtual_file_path();
@@ -101,6 +111,7 @@ fn format_text_document(
         query.source_type(),
         &settings.formatter,
         &file_path,
+        backend,
     )
     .with_failure_code(lsp_server::ErrorCode::InternalError)?;
     let Some(mut formatted) = formatted else {

crates/ruff_server/src/server/api/requests/format_range.rs

@@ -36,7 +36,11 @@ fn format_document_range(
         .context("Failed to get text document for the format range request")
         .unwrap();
     let query = snapshot.query();
-    format_text_document_range(text_document, range, query, snapshot.encoding())
+    let backend = snapshot
+        .client_settings()
+        .editor_settings()
+        .format_backend();
+    format_text_document_range(text_document, range, query, snapshot.encoding(), backend)
 }
 
 /// Formats the specified [`Range`] in the [`TextDocument`].
@@ -45,6 +49,7 @@ fn format_text_document_range(
     range: Range,
     query: &DocumentQuery,
     encoding: PositionEncoding,
+    backend: crate::format::FormatBackend,
 ) -> Result<super::FormatResponse> {
     let settings = query.settings();
     let file_path = query.virtual_file_path();
@@ -68,6 +73,7 @@ fn format_text_document_range(
         &settings.formatter,
         range,
         &file_path,
+        backend,
     )
     .with_failure_code(lsp_server::ErrorCode::InternalError)?;
 

crates/ruff_server/src/session/index/ruff_settings.rs

@@ -401,6 +401,7 @@ impl ConfigurationTransformer for EditorConfigurationTransformer<'_> {
             configuration,
             format_preview,
             lint_preview,
+            format_backend: _,
             select,
             extend_select,
             ignore,

crates/ruff_server/src/session/options.rs

@@ -7,9 +7,12 @@ use serde_json::{Map, Value};
 
 use ruff_linter::{RuleSelector, line_width::LineLength, rule_selector::ParseError};
 
-use crate::session::{
-    Client,
-    settings::{ClientSettings, EditorSettings, GlobalClientSettings, ResolvedConfiguration},
+use crate::{
+    format::FormatBackend,
+    session::{
+        Client,
+        settings::{ClientSettings, EditorSettings, GlobalClientSettings, ResolvedConfiguration},
+    },
 };
 
 pub(crate) type WorkspaceOptionsMap = FxHashMap<Url, ClientOptions>;
@@ -124,6 +127,7 @@ impl ClientOptions {
             configuration,
             lint_preview: lint.preview,
             format_preview: format.preview,
+            format_backend: format.backend,
             select: lint.select.and_then(|select| {
                 Self::resolve_rules(
                     &select,
@@ -283,11 +287,13 @@ impl Combine for LintOptions {
 #[serde(rename_all = "camelCase")]
 struct FormatOptions {
     preview: Option<bool>,
+    backend: Option<FormatBackend>,
 }
 
 impl Combine for FormatOptions {
     fn combine_with(&mut self, other: Self) {
         self.preview.combine_with(other.preview);
+        self.backend.combine_with(other.backend);
     }
 }
 
@@ -443,6 +449,12 @@ pub(crate) trait Combine {
     fn combine_with(&mut self, other: Self);
 }
 
+impl Combine for FormatBackend {
+    fn combine_with(&mut self, other: Self) {
+        *self = other;
+    }
+}
+
 impl<T> Combine for Option<T>
 where
     T: Combine,
@@ -584,6 +596,7 @@ mod tests {
                     format: Some(
                         FormatOptions {
                             preview: None,
+                            backend: None,
                         },
                     ),
                     code_action: Some(
@@ -640,6 +653,7 @@ mod tests {
                         format: Some(
                             FormatOptions {
                                 preview: None,
+                                backend: None,
                             },
                         ),
                         code_action: Some(
@@ -704,6 +718,7 @@ mod tests {
                         format: Some(
                             FormatOptions {
                                 preview: None,
+                                backend: None,
                             },
                         ),
                         code_action: Some(
@@ -782,6 +797,7 @@ mod tests {
                     configuration: None,
                     lint_preview: Some(true),
                     format_preview: None,
+                    format_backend: None,
                     select: Some(vec![
                         RuleSelector::Linter(Linter::Pyflakes),
                         RuleSelector::Linter(Linter::Isort)
@@ -819,6 +835,7 @@ mod tests {
                     configuration: None,
                     lint_preview: Some(false),
                     format_preview: None,
+                    format_backend: None,
                     select: Some(vec![
                         RuleSelector::Linter(Linter::Pyflakes),
                         RuleSelector::Linter(Linter::Isort)
@@ -919,6 +936,7 @@ mod tests {
                     configuration: None,
                     lint_preview: None,
                     format_preview: None,
+                    format_backend: None,
                     select: None,
                     extend_select: None,
                     ignore: Some(vec![RuleSelector::from_str("RUF001").unwrap()]),

crates/ruff_server/src/session/settings.rs

@@ -8,6 +8,7 @@ use ruff_workspace::options::Options;
 
 use crate::{
     ClientOptions,
+    format::FormatBackend,
     session::{
         Client,
         options::{ClientConfiguration, ConfigurationPreference},
@@ -84,6 +85,7 @@ pub(crate) struct EditorSettings {
     pub(super) configuration: Option<ResolvedConfiguration>,
     pub(super) lint_preview: Option<bool>,
     pub(super) format_preview: Option<bool>,
+    pub(super) format_backend: Option<FormatBackend>,
     pub(super) select: Option<Vec<RuleSelector>>,
     pub(super) extend_select: Option<Vec<RuleSelector>>,
     pub(super) ignore: Option<Vec<RuleSelector>>,
@@ -163,3 +165,9 @@ impl ClientSettings {
         &self.editor_settings
     }
 }
+
+impl EditorSettings {
+    pub(crate) fn format_backend(&self) -> FormatBackend {
+        self.format_backend.unwrap_or_default()
+    }
+}

crates/ruff_wasm/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff_wasm"
-version = "0.12.11"
+version = "0.12.12"
 publish = false
 authors = { workspace = true }
 edition = { workspace = true }

crates/ty/docs/cli.md

@@ -60,8 +60,9 @@ over all configuration files.</p>
 </dd><dt id="ty-check--output-format"><a href="#ty-check--output-format"><code>--output-format</code></a> <i>output-format</i></dt><dd><p>The format to use for printing diagnostic messages</p>
 <p>Possible values:</p>
 <ul>
-<li><code>full</code>:  Print diagnostics verbosely, with context and helpful hints [default]</li>
+<li><code>full</code>:  Print diagnostics verbosely, with context and helpful hints (default)</li>
 <li><code>concise</code>:  Print diagnostics concisely, one per line</li>
+<li><code>gitlab</code>:  Print diagnostics in the JSON format expected by GitLab Code Quality reports</li>
 </ul></dd><dt id="ty-check--project"><a href="#ty-check--project"><code>--project</code></a> <i>project</i></dt><dd><p>Run the command within the given project directory.</p>
 <p>All <code>pyproject.toml</code> files will be discovered by walking up the directory tree from the given project directory, as will the project's virtual environment (<code>.venv</code>) unless the <code>venv-path</code> option is set.</p>
 <p>Other command-line arguments (such as relative paths) will be resolved relative to the current working directory.</p>

crates/ty/docs/configuration.md

@@ -144,7 +144,7 @@ If left unspecified, ty will try to detect common project layouts and initialize
 * if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path
 * otherwise, default to `.` (flat layout)
 
-Besides, if a `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),
+Besides, if a `./python` or `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),
 it will also be included in the first party search path.
 
 **Default value**: `null`

crates/ty/src/args.rs

@@ -306,7 +306,7 @@ impl clap::Args for RulesArg {
 /// The diagnostic output format.
 #[derive(Copy, Clone, Hash, Debug, PartialEq, Eq, PartialOrd, Ord, Default, clap::ValueEnum)]
 pub enum OutputFormat {
-    /// Print diagnostics verbosely, with context and helpful hints \[default\].
+    /// Print diagnostics verbosely, with context and helpful hints (default).
     ///
     /// Diagnostic messages may include additional context and
     /// annotations on the input to help understand the message.
@@ -321,6 +321,9 @@ pub enum OutputFormat {
     /// dropped.
     #[value(name = "concise")]
     Concise,
+    /// Print diagnostics in the JSON format expected by GitLab Code Quality reports.
+    #[value(name = "gitlab")]
+    Gitlab,
 }
 
 impl From<OutputFormat> for ty_project::metadata::options::OutputFormat {
@@ -328,6 +331,7 @@ impl From<OutputFormat> for ty_project::metadata::options::OutputFormat {
         match format {
             OutputFormat::Full => Self::Full,
             OutputFormat::Concise => Self::Concise,
+            OutputFormat::Gitlab => Self::Gitlab,
         }
     }
 }

crates/ty/src/lib.rs

@@ -21,7 +21,7 @@ use clap::{CommandFactory, Parser};
 use colored::Colorize;
 use crossbeam::channel as crossbeam_channel;
 use rayon::ThreadPoolBuilder;
-use ruff_db::diagnostic::{Diagnostic, DisplayDiagnosticConfig, Severity};
+use ruff_db::diagnostic::{Diagnostic, DisplayDiagnosticConfig, DisplayDiagnostics, Severity};
 use ruff_db::files::File;
 use ruff_db::max_parallelism;
 use ruff_db::system::{OsSystem, SystemPath, SystemPathBuf};
@@ -319,37 +319,48 @@ impl MainLoop {
                             return Ok(ExitStatus::Success);
                         }
 
+                        let is_human_readable = terminal_settings.output_format.is_human_readable();
+
                         if result.is_empty() {
-                            writeln!(
-                                self.printer.stream_for_success_summary(),
-                                "{}",
-                                "All checks passed!".green().bold()
-                            )?;
+                            if is_human_readable {
+                                writeln!(
+                                    self.printer.stream_for_success_summary(),
+                                    "{}",
+                                    "All checks passed!".green().bold()
+                                )?;
+                            }
 
                             if self.watcher.is_none() {
                                 return Ok(ExitStatus::Success);
                             }
                         } else {
-                            let mut max_severity = Severity::Info;
                             let diagnostics_count = result.len();
 
                             let mut stdout = self.printer.stream_for_details().lock();
-                            for diagnostic in result {
-                                // Only render diagnostics if they're going to be displayed, since doing
-                                // so is expensive.
-                                if stdout.is_enabled() {
-                                    write!(stdout, "{}", diagnostic.display(db, &display_config))?;
-                                }
+                            let max_severity = result
+                                .iter()
+                                .map(Diagnostic::severity)
+                                .max()
+                                .unwrap_or(Severity::Info);
 
-                                max_severity = max_severity.max(diagnostic.severity());
+                            // Only render diagnostics if they're going to be displayed, since doing
+                            // so is expensive.
+                            if stdout.is_enabled() {
+                                write!(
+                                    stdout,
+                                    "{}",
+                                    DisplayDiagnostics::new(db, &display_config, &result)
+                                )?;
                             }
 
-                            writeln!(
-                                self.printer.stream_for_failure_summary(),
-                                "Found {} diagnostic{}",
-                                diagnostics_count,
-                                if diagnostics_count > 1 { "s" } else { "" }
-                            )?;
+                            if is_human_readable {
+                                writeln!(
+                                    self.printer.stream_for_failure_summary(),
+                                    "Found {} diagnostic{}",
+                                    diagnostics_count,
+                                    if diagnostics_count > 1 { "s" } else { "" }
+                                )?;
+                            }
 
                             if max_severity.is_fatal() {
                                 tracing::warn!(