ZeroDivisionError for complex too

add tests for bools and make helper method private
combine the two rules
2025-07-14 17:54:58 +01:00 · 2025-07-14 17:48:16 +01:00 · 2025-07-14 17:48:11 +01:00 · 2025-07-14 17:46:32 +01:00 · 2025-07-14 17:46:32 +01:00 · 2025-07-14 17:46:32 +01:00
855 changed files with 94707 additions and 10383 deletions
--- a/.github/mypy-primer-ty.toml
+++ b/.github/mypy-primer-ty.toml
@@ -5,4 +5,4 @@
 [rules]
 possibly-unresolved-reference = "warn"
 unused-ignore-comment = "warn"
-division-by-zero = "warn"
+literal-math-error = "warn"
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -240,11 +240,11 @@ jobs:
      - name: "Install mold"
        uses: rui314/setup-mold@85c79d00377f0d32cdbae595a46de6f7c2fa6599 # v1
      - name: "Install cargo nextest"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-nextest
      - name: "Install cargo insta"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-insta
      - name: ty mdtests (GitHub annotations)
@@ -298,11 +298,11 @@ jobs:
      - name: "Install mold"
        uses: rui314/setup-mold@85c79d00377f0d32cdbae595a46de6f7c2fa6599 # v1
      - name: "Install cargo nextest"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-nextest
      - name: "Install cargo insta"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-insta
      - name: "Run tests"
@@ -325,7 +325,7 @@ jobs:
      - name: "Install Rust toolchain"
        run: rustup show
      - name: "Install cargo nextest"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-nextest
      - name: "Run tests"
@@ -407,20 +407,11 @@ jobs:
        run: rustup default "${MSRV}"
      - name: "Install mold"
        uses: rui314/setup-mold@85c79d00377f0d32cdbae595a46de6f7c2fa6599 # v1
-      - name: "Install cargo nextest"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
-        with:
-          tool: cargo-nextest
-      - name: "Install cargo insta"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
-        with:
-          tool: cargo-insta
-      - name: "Run tests"
+      - name: "Build tests"
        shell: bash
        env:
-          NEXTEST_PROFILE: "ci"
          MSRV: ${{ steps.msrv.outputs.value }}
-        run: cargo "+${MSRV}" insta test --all-features --unreferenced reject --test-runner nextest
+        run: cargo "+${MSRV}" test --no-run --all-features

  cargo-fuzz-build:
    name: "cargo fuzz build"
@@ -912,7 +903,7 @@ jobs:
        run: rustup show

      - name: "Install codspeed"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-codspeed

@@ -920,7 +911,7 @@ jobs:
        run: cargo codspeed build --features "codspeed,instrumented" --no-default-features -p ruff_benchmark

      - name: "Run benchmarks"
-        uses: CodSpeedHQ/action@0010eb0ca6e89b80c88e8edaaa07cfe5f3e6664d # v3.5.0
+        uses: CodSpeedHQ/action@c28fe9fbe7d57a3da1b7834ae3761c1d8217612d # v3.7.0
        with:
          run: cargo codspeed run
          token: ${{ secrets.CODSPEED_TOKEN }}
@@ -945,7 +936,7 @@ jobs:
        run: rustup show

      - name: "Install codspeed"
-        uses: taiki-e/install-action@f3a27926ea13d7be3ee2f4cbb925883cf9442b56 # v2.56.7
+        uses: taiki-e/install-action@c07504cae06f832dc8de08911c9a9c5cddb0d2d3 # v2.56.13
        with:
          tool: cargo-codspeed

@@ -953,7 +944,7 @@ jobs:
        run: cargo codspeed build --features "codspeed,walltime" --no-default-features -p ruff_benchmark

      - name: "Run benchmarks"
-        uses: CodSpeedHQ/action@0010eb0ca6e89b80c88e8edaaa07cfe5f3e6664d # v3.5.0
+        uses: CodSpeedHQ/action@c28fe9fbe7d57a3da1b7834ae3761c1d8217612d # v3.7.0
        with:
          run: cargo codspeed run
          token: ${{ secrets.CODSPEED_TOKEN }}
--- a/.github/workflows/sync_typeshed.yaml
+++ b/.github/workflows/sync_typeshed.yaml
@@ -36,9 +36,40 @@ jobs:
        run: |
          git config --global user.name typeshedbot
          git config --global user.email '<>'
+      - uses: astral-sh/setup-uv@bd01e18f51369d5a26f1651c3cb451d3417e3bba # v6.3.1
      - name: Sync typeshed
        id: sync
        run: |
+          docstring_adder="git+https://github.com/astral-sh/docstring-adder.git@6de51c5f44aea11fe8c8f2d30f9ee0683682c3d2"
+
+          # Run with the full matrix of Python versions supported by typeshed,
+          # so that we codemod in docstrings that only exist on certain versions.
+          #
+          # The codemod will only add docstrings to functions/classes that do not
+          # already have docstrings. We run with Python 3.14 before running with
+          # any other Python version so that we get the Python 3.14 version of the
+          # docstring for a definition that exists on all Python versions: if we
+          # ran with Python 3.9 first, then the later runs with Python 3.10+ would
+          # not modify the docstring that had already been added using the old version of Python.
+          #
+          # TODO: In order to add docstrings for platform-specific APIs, we would also
+          # need to run the codemod on Windows. We get the runtime docstrings by inspecting
+          # the docstrings at runtime, so if an API doesn't exist at runtime (because e.g.
+          # it's Windows-specific and we're running on Linux), then we won't add a docstring to it.
+          #
+          uvx --python=3.14 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+          uvx --python=3.13 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+          uvx --python=3.12 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+          uvx --python=3.11 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+          uvx --python=3.10 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+          uvx --python=3.9 --force-reinstall --from="${docstring_adder}" add-docstrings --stdlib-path ./typeshed/stdlib
+
+          # Here we just reformat the codemodded stubs so that they are
+          # consistent with the other typeshed stubs around them.
+          # Typeshed formats code using black in their CI, so we just invoke
+          # black on the stubs the same way that typeshed does.
+          uvx --directory=typeshed pre-commit run -a black || true
+
          rm -rf ruff/crates/ty_vendored/vendor/typeshed
          mkdir ruff/crates/ty_vendored/vendor/typeshed
          cp typeshed/README.md ruff/crates/ty_vendored/vendor/typeshed
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -81,7 +81,7 @@ repos:
        pass_filenames: false # This makes it a lot faster

  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.12.2
+    rev: v0.12.3
    hooks:
      - id: ruff-format
      - id: ruff
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,33 @@
 # Changelog

+## 0.12.3
+
+### Preview features
+
+- \[`flake8-bugbear`\] Support non-context-manager calls in `B017` ([#19063](https://github.com/astral-sh/ruff/pull/19063))
+- \[`flake8-use-pathlib`\] Add autofixes for `PTH100`, `PTH106`, `PTH107`, `PTH108`, `PTH110`, `PTH111`, `PTH112`, `PTH113`, `PTH114`, `PTH115`, `PTH117`, `PTH119`, `PTH120` ([#19213](https://github.com/astral-sh/ruff/pull/19213))
+- \[`flake8-use-pathlib`\] Add autofixes for `PTH203`, `PTH204`, `PTH205` ([#18922](https://github.com/astral-sh/ruff/pull/18922))
+
+### Bug fixes
+
+- \[`flake8-return`\] Fix false-positive for variables used inside nested functions in `RET504` ([#18433](https://github.com/astral-sh/ruff/pull/18433))
+- Treat form feed as valid whitespace before a line continuation ([#19220](https://github.com/astral-sh/ruff/pull/19220))
+- \[`flake8-type-checking`\] Fix syntax error introduced by fix (`TC008`) ([#19150](https://github.com/astral-sh/ruff/pull/19150))
+- \[`pyupgrade`\] Keyword arguments in `super` should suppress the `UP008` fix ([#19131](https://github.com/astral-sh/ruff/pull/19131))
+
+### Documentation
+
+- \[`flake8-pyi`\] Make example error out-of-the-box (`PYI007`, `PYI008`) ([#19103](https://github.com/astral-sh/ruff/pull/19103))
+- \[`flake8-simplify`\] Make example error out-of-the-box (`SIM116`) ([#19111](https://github.com/astral-sh/ruff/pull/19111))
+- \[`flake8-type-checking`\] Make example error out-of-the-box (`TC001`) ([#19151](https://github.com/astral-sh/ruff/pull/19151))
+- \[`flake8-use-pathlib`\] Make example error out-of-the-box (`PTH210`) ([#19189](https://github.com/astral-sh/ruff/pull/19189))
+- \[`pycodestyle`\] Make example error out-of-the-box (`E272`) ([#19191](https://github.com/astral-sh/ruff/pull/19191))
+- \[`pycodestyle`\] Make example not raise unnecessary `SyntaxError` (`E114`) ([#19190](https://github.com/astral-sh/ruff/pull/19190))
+- \[`pydoclint`\] Make example error out-of-the-box (`DOC501`) ([#19218](https://github.com/astral-sh/ruff/pull/19218))
+- \[`pylint`, `pyupgrade`\] Fix syntax errors in examples (`PLW1501`, `UP028`) ([#19127](https://github.com/astral-sh/ruff/pull/19127))
+- \[`pylint`\] Update `missing-maxsplit-arg` docs and error to suggest proper usage (`PLC0207`) ([#18949](https://github.com/astral-sh/ruff/pull/18949))
+- \[`flake8-bandit`\] Make example error out-of-the-box (`S412`) ([#19241](https://github.com/astral-sh/ruff/pull/19241))
+
 ## 0.12.2

 ### Preview features
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -396,9 +396,9 @@ dependencies = [

 [[package]]
 name = "clap"
-version = "4.5.40"
+version = "4.5.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40b6887a1d8685cebccf115538db5c0efe625ccac9696ad45c409d96566e910f"
+checksum = "be92d32e80243a54711e5d7ce823c35c41c9d929dc4ab58e1276f625841aadf9"
 dependencies = [
 "clap_builder",
 "clap_derive",
@@ -406,9 +406,9 @@ dependencies = [

 [[package]]
 name = "clap_builder"
-version = "4.5.40"
+version = "4.5.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0c66c08ce9f0c698cbce5c0279d0bb6ac936d8674174fe48f736533b964f59e"
+checksum = "707eab41e9622f9139419d573eca0900137718000c517d47da73045f54331c3d"
 dependencies = [
 "anstream",
 "anstyle",
@@ -449,9 +449,9 @@ dependencies = [

 [[package]]
 name = "clap_derive"
-version = "4.5.40"
+version = "4.5.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2c7947ae4cc3d851207c1adb5b5e260ff0cca11446b1d6d1423788e442257ce"
+checksum = "ef4f52386a59ca4c860f7393bcf8abd8dfd91ecccc0f774635ff68e92eeef491"
 dependencies = [
 "heck",
 "proc-macro2",
@@ -591,7 +591,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "117725a109d387c937a1533ce01b450cbde6b88abceea8473c4d7a85853cda3c"
 dependencies = [
 "lazy_static",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -600,7 +600,7 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fde0e0ec90c9dfb3b4b1a0891a7dcd0e2bffde2f7efed5fe7c9bb00e5bfb915e"
 dependencies = [
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -933,7 +933,7 @@ dependencies = [
 "libc",
 "option-ext",
 "redox_users",
- "windows-sys 0.59.0",
+ "windows-sys 0.60.2",
 ]

 [[package]]
@@ -1013,7 +1013,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cea14ef9355e3beab063703aa9dab15afd25f0667c341310c1e5274bb1d0da18"
 dependencies = [
 "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -1133,9 +1133,9 @@ dependencies = [

 [[package]]
 name = "get-size-derive2"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aac2af9f9a6a50e31b1e541d05b7925add83d3982c2793193fe9d4ee584323c"
+checksum = "028f3cfad7c3e3b1d8d04ef0a1c03576f2d62800803fe1301a4cd262849f2dea"
 dependencies = [
 "attribute-derive",
 "quote",
@@ -1144,9 +1144,9 @@ dependencies = [

 [[package]]
 name = "get-size2"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a0312efd19e1c45922dfcc2d6806d3ffc4bca261f89f31fcc4f63f438d885"
+checksum = "3a09c2043819a3def7bfbb4927e7df96aab0da4cfd8824484b22d0c94e84458e"
 dependencies = [
 "compact_str",
 "get-size-derive2",
@@ -1586,7 +1586,7 @@ checksum = "e04d7f318608d35d4b61ddd75cbdaee86b023ebe2bd5a66ee0915f0bf93095a9"
 dependencies = [
 "hermit-abi 0.5.1",
 "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -1650,7 +1650,7 @@ dependencies = [
 "portable-atomic",
 "portable-atomic-util",
 "serde",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -2465,7 +2465,7 @@ dependencies = [
 "pep508_rs",
 "serde",
 "thiserror 2.0.12",
- "toml",
+ "toml 0.8.23",
 ]

 [[package]]
@@ -2711,7 +2711,7 @@ dependencies = [

 [[package]]
 name = "ruff"
-version = "0.12.2"
+version = "0.12.3"
 dependencies = [
 "anyhow",
 "argfile",
@@ -2763,7 +2763,7 @@ dependencies = [
 "test-case",
 "thiserror 2.0.12",
 "tikv-jemallocator",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "walkdir",
 "wild",
@@ -2779,7 +2779,7 @@ dependencies = [
 "ruff_annotate_snippets",
 "serde",
 "snapbox",
- "toml",
+ "toml 0.9.2",
 "tryfn",
 "unicode-width 0.2.1",
 ]
@@ -2852,6 +2852,7 @@ dependencies = [
 "salsa",
 "schemars",
 "serde",
+ "serde_json",
 "tempfile",
 "thiserror 2.0.12",
 "tracing",
@@ -2894,7 +2895,7 @@ dependencies = [
 "similar",
 "strum",
 "tempfile",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "tracing-indicatif",
 "tracing-subscriber",
@@ -2961,7 +2962,7 @@ dependencies = [

 [[package]]
 name = "ruff_linter"
-version = "0.12.2"
+version = "0.12.3"
 dependencies = [
 "aho-corasick",
 "anyhow",
@@ -3015,7 +3016,7 @@ dependencies = [
 "tempfile",
 "test-case",
 "thiserror 2.0.12",
- "toml",
+ "toml 0.9.2",
 "typed-arena",
 "unicode-normalization",
 "unicode-width 0.2.1",
@@ -3265,7 +3266,7 @@ dependencies = [
 "serde_json",
 "shellexpand",
 "thiserror 2.0.12",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "tracing-log",
 "tracing-subscriber",
@@ -3294,7 +3295,7 @@ dependencies = [

 [[package]]
 name = "ruff_wasm"
-version = "0.12.2"
+version = "0.12.3"
 dependencies = [
 "console_error_panic_hook",
 "console_log",
@@ -3355,7 +3356,7 @@ dependencies = [
 "shellexpand",
 "strum",
 "tempfile",
- "toml",
+ "toml 0.9.2",
 ]

 [[package]]
@@ -3390,7 +3391,7 @@ dependencies = [
 "errno",
 "libc",
 "linux-raw-sys",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -3575,6 +3576,15 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "serde_spanned"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40734c41988f7306bb04f0ecf60ec0f3f1caa34290e4e8ea471dcd3346483b83"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_test"
 version = "1.0.177"
@@ -3780,7 +3790,7 @@ dependencies = [
 "getrandom 0.3.3",
 "once_cell",
 "rustix",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
@@ -3980,11 +3990,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
 dependencies = [
 "serde",
- "serde_spanned",
- "toml_datetime",
+ "serde_spanned 0.6.9",
+ "toml_datetime 0.6.11",
 "toml_edit",
 ]

+[[package]]
+name = "toml"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed0aee96c12fa71097902e0bb061a5e1ebd766a6636bb605ba401c45c1650eac"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned 1.0.0",
+ "toml_datetime 0.7.0",
+ "toml_parser",
+ "toml_writer",
+ "winnow",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.6.11"
@@ -3994,6 +4019,15 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "toml_datetime"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bade1c3e902f58d73d3f294cd7f20391c1cb2fbcb643b73566bc773971df91e3"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "toml_edit"
 version = "0.22.27"
@@ -4002,17 +4036,25 @@ checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
 dependencies = [
 "indexmap",
 "serde",
- "serde_spanned",
- "toml_datetime",
- "toml_write",
+ "serde_spanned 0.6.9",
+ "toml_datetime 0.6.11",
 "winnow",
 ]

 [[package]]
-name = "toml_write"
-version = "0.1.2"
+name = "toml_parser"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+checksum = "97200572db069e74c512a14117b296ba0a80a30123fbbb5aa1f4a348f639ca30"
+dependencies = [
+ "winnow",
+]
+
+[[package]]
+name = "toml_writer"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcc842091f2def52017664b53082ecbbeb5c7731092bad69d2c63050401dfd64"

 [[package]]
 name = "tracing"
@@ -4135,7 +4177,7 @@ dependencies = [
 "ruff_python_trivia",
 "salsa",
 "tempfile",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "tracing-flame",
 "tracing-subscriber",
@@ -4152,9 +4194,12 @@ version = "0.0.0"
 dependencies = [
 "bitflags 2.9.1",
 "insta",
+ "regex",
 "ruff_db",
 "ruff_python_ast",
 "ruff_python_parser",
+ "ruff_python_trivia",
+ "ruff_source_file",
 "ruff_text_size",
 "rustc-hash",
 "salsa",
@@ -4193,7 +4238,7 @@ dependencies = [
 "schemars",
 "serde",
 "thiserror 2.0.12",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "ty_ide",
 "ty_python_semantic",
@@ -4262,6 +4307,7 @@ dependencies = [
 "lsp-types",
 "ruff_db",
 "ruff_notebook",
+ "ruff_python_ast",
 "ruff_source_file",
 "ruff_text_size",
 "rustc-hash",
@@ -4269,6 +4315,7 @@ dependencies = [
 "serde",
 "serde_json",
 "shellexpand",
+ "thiserror 2.0.12",
 "tracing",
 "tracing-subscriber",
 "ty_ide",
@@ -4309,7 +4356,7 @@ dependencies = [
 "smallvec",
 "tempfile",
 "thiserror 2.0.12",
- "toml",
+ "toml 0.9.2",
 "tracing",
 "ty_python_semantic",
 "ty_static",
@@ -4803,7 +4850,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]

 [[package]]
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -165,7 +165,7 @@ tempfile = { version = "3.9.0" }
 test-case = { version = "3.3.1" }
 thiserror = { version = "2.0.0" }
 tikv-jemallocator = { version = "0.6.0" }
-toml = { version = "0.8.11" }
+toml = { version = "0.9.0" }
 tracing = { version = "0.1.40" }
 tracing-flame = { version = "0.2.0" }
 tracing-indicatif = { version = "0.3.11" }
--- a/README.md
+++ b/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/0.12.2/install.sh | sh
-powershell -c "irm https://astral.sh/ruff/0.12.2/install.ps1 | iex"
+curl -LsSf https://astral.sh/ruff/0.12.3/install.sh | sh
+powershell -c "irm https://astral.sh/ruff/0.12.3/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: v0.12.2
+  rev: v0.12.3
  hooks:
    # Run the linter.
    - id: ruff-check
--- a/crates/ruff/Cargo.toml
+++ b/crates/ruff/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.12.2"
+version = "0.12.3"
 publish = true
 authors = { workspace = true }
 edition = { workspace = true }
--- a/crates/ruff/src/lib.rs
+++ b/crates/ruff/src/lib.rs
@@ -131,6 +131,7 @@ pub fn run(
    }: Args,
 ) -> Result<ExitStatus> {
    {
+        ruff_db::set_program_version(crate::version::version().to_string()).unwrap();
        let default_panic_hook = std::panic::take_hook();
        std::panic::set_hook(Box::new(move |info| {
            #[expect(clippy::print_stderr)]
@@ -439,7 +440,7 @@ pub fn check(args: CheckCommand, global_options: GlobalConfigArgs) -> Result<Exi
        if cli.statistics {
            printer.write_statistics(&diagnostics, &mut summary_writer)?;
        } else {
-            printer.write_once(&diagnostics, &mut summary_writer)?;
+            printer.write_once(&diagnostics, &mut summary_writer, preview)?;
        }

        if !cli.exit_zero {
--- a/crates/ruff/src/printer.rs
+++ b/crates/ruff/src/printer.rs
@@ -9,13 +9,14 @@ use itertools::{Itertools, iterate};
 use ruff_linter::linter::FixTable;
 use serde::Serialize;

-use ruff_db::diagnostic::{Diagnostic, SecondaryCode};
+use ruff_db::diagnostic::{
+    Diagnostic, DiagnosticFormat, DisplayDiagnosticConfig, DisplayDiagnostics, SecondaryCode,
+};
 use ruff_linter::fs::relativize_path;
 use ruff_linter::logging::LogLevel;
 use ruff_linter::message::{
-    AzureEmitter, Emitter, EmitterContext, GithubEmitter, GitlabEmitter, GroupedEmitter,
-    JsonEmitter, JsonLinesEmitter, JunitEmitter, PylintEmitter, RdjsonEmitter, SarifEmitter,
-    TextEmitter,
+    Emitter, EmitterContext, GithubEmitter, GitlabEmitter, GroupedEmitter, JunitEmitter,
+    PylintEmitter, RdjsonEmitter, SarifEmitter, TextEmitter,
 };
 use ruff_linter::notify_user;
 use ruff_linter::settings::flags::{self};
@@ -202,6 +203,7 @@ impl Printer {
        &self,
        diagnostics: &Diagnostics,
        writer: &mut dyn Write,
+        preview: bool,
    ) -> Result<()> {
        if matches!(self.log_level, LogLevel::Silent) {
            return Ok(());
@@ -229,13 +231,21 @@ impl Printer {

        match self.format {
            OutputFormat::Json => {
-                JsonEmitter.emit(writer, &diagnostics.inner, &context)?;
+                let config = DisplayDiagnosticConfig::default()
+                    .format(DiagnosticFormat::Json)
+                    .preview(preview);
+                let value = DisplayDiagnostics::new(&context, &config, &diagnostics.inner);
+                write!(writer, "{value}")?;
            }
            OutputFormat::Rdjson => {
                RdjsonEmitter.emit(writer, &diagnostics.inner, &context)?;
            }
            OutputFormat::JsonLines => {
-                JsonLinesEmitter.emit(writer, &diagnostics.inner, &context)?;
+                let config = DisplayDiagnosticConfig::default()
+                    .format(DiagnosticFormat::JsonLines)
+                    .preview(preview);
+                let value = DisplayDiagnostics::new(&context, &config, &diagnostics.inner);
+                write!(writer, "{value}")?;
            }
            OutputFormat::Junit => {
                JunitEmitter.emit(writer, &diagnostics.inner, &context)?;
@@ -283,7 +293,11 @@ impl Printer {
                PylintEmitter.emit(writer, &diagnostics.inner, &context)?;
            }
            OutputFormat::Azure => {
-                AzureEmitter.emit(writer, &diagnostics.inner, &context)?;
+                let config = DisplayDiagnosticConfig::default()
+                    .format(DiagnosticFormat::Azure)
+                    .preview(preview);
+                let value = DisplayDiagnostics::new(&context, &config, &diagnostics.inner);
+                write!(writer, "{value}")?;
            }
            OutputFormat::Sarif => {
                SarifEmitter.emit(writer, &diagnostics.inner, &context)?;
--- a/crates/ruff/tests/format.rs
+++ b/crates/ruff/tests/format.rs
@@ -120,7 +120,7 @@ fn nonexistent_config_file() {
 #[test]
 fn config_override_rejected_if_invalid_toml() {
    assert_cmd_snapshot!(Command::new(get_cargo_bin(BIN_NAME))
-        .args(["format", "--config", "foo = bar", "."]), @r#"
+        .args(["format", "--config", "foo = bar", "."]), @r"
    success: false
    exit_code: 2
    ----- stdout -----
@@ -137,12 +137,11 @@ fn config_override_rejected_if_invalid_toml() {
    TOML parse error at line 1, column 7
      |
    1 | foo = bar
-      |       ^
-    invalid string
-    expected `"`, `'`
+      |       ^^^
+    string values must be quoted, expected literal string

    For more information, try '--help'.
-    "#);
+    ");
 }

 #[test]
--- a/crates/ruff/tests/integration_test.rs
+++ b/crates/ruff/tests/integration_test.rs
@@ -2246,8 +2246,7 @@ fn pyproject_toml_stdin_syntax_error() {
    success: false
    exit_code: 1
    ----- stdout -----
-    pyproject.toml:1:9: RUF200 Failed to parse pyproject.toml: invalid table header
-    expected `.`, `]`
+    pyproject.toml:1:9: RUF200 Failed to parse pyproject.toml: unclosed table, expected `]`
      |
    1 | [project
      |         ^ RUF200
--- a/crates/ruff/tests/lint.rs
+++ b/crates/ruff/tests/lint.rs
@@ -534,7 +534,7 @@ fn nonexistent_config_file() {
 fn config_override_rejected_if_invalid_toml() {
    assert_cmd_snapshot!(Command::new(get_cargo_bin(BIN_NAME))
        .args(STDIN_BASE_OPTIONS)
-        .args(["--config", "foo = bar", "."]), @r#"
+        .args(["--config", "foo = bar", "."]), @r"
    success: false
    exit_code: 2
    ----- stdout -----
@@ -551,12 +551,11 @@ fn config_override_rejected_if_invalid_toml() {
    TOML parse error at line 1, column 7
      |
    1 | foo = bar
-      |       ^
-    invalid string
-    expected `"`, `'`
+      |       ^^^
+    string values must be quoted, expected literal string

    For more information, try '--help'.
-    "#);
+    ");
 }

 #[test]
@@ -733,9 +732,8 @@ select = [E501]
      Cause: TOML parse error at line 3, column 11
      |
    3 | select = [E501]
-      |           ^
-    invalid array
-    expected `]`
+      |           ^^^^
+    string values must be quoted, expected literal string
    ");
    });

@@ -876,7 +874,7 @@ fn each_toml_option_requires_a_new_flag_1() {
      |
    1 | extend-select=['F841'], line-length=90
      |                       ^
-    expected newline, `#`
+    unexpected key or value, expected newline, `#`

    For more information, try '--help'.
    ");
@@ -907,7 +905,7 @@ fn each_toml_option_requires_a_new_flag_2() {
      |
    1 | extend-select=['F841'] line-length=90
      |                        ^
-    expected newline, `#`
+    unexpected key or value, expected newline, `#`

    For more information, try '--help'.
    ");
@@ -5692,3 +5690,57 @@ class Foo:
    "
    );
 }
+
+#[test_case::test_case("concise")]
+#[test_case::test_case("full")]
+#[test_case::test_case("json")]
+#[test_case::test_case("json-lines")]
+#[test_case::test_case("junit")]
+#[test_case::test_case("grouped")]
+#[test_case::test_case("github")]
+#[test_case::test_case("gitlab")]
+#[test_case::test_case("pylint")]
+#[test_case::test_case("rdjson")]
+#[test_case::test_case("azure")]
+#[test_case::test_case("sarif")]
+fn output_format(output_format: &str) -> Result<()> {
+    const CONTENT: &str = "\
+import os  # F401
+x = y      # F821
+match 42:  # invalid-syntax
+    case _: ...
+";
+
+    let tempdir = TempDir::new()?;
+    let input = tempdir.path().join("input.py");
+    fs::write(&input, CONTENT)?;
+
+    let snapshot = format!("output_format_{output_format}");
+
+    insta::with_settings!({
+        filters => vec![
+            (tempdir_filter(&tempdir).as_str(), "[TMP]/"),
+            (r#""[^"]+\\?/?input.py"#, r#""[TMP]/input.py"#),
+            (ruff_linter::VERSION, "[VERSION]"),
+        ]
+    }, {
+        assert_cmd_snapshot!(
+            snapshot,
+            Command::new(get_cargo_bin(BIN_NAME))
+                .args([
+                    "check",
+                    "--no-cache",
+                    "--output-format",
+                    output_format,
+                    "--select",
+                    "F401,F821",
+                    "--target-version",
+                    "py39",
+                    "input.py",
+                ])
+                .current_dir(&tempdir),
+        );
+    });
+
+    Ok(())
+}
--- a/crates/ruff/tests/snapshots/lint__output_format_azure.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_azure.snap
@@ -0,0 +1,23 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - azure
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+##vso[task.logissue type=error;sourcepath=[TMP]/input.py;linenumber=1;columnnumber=8;code=F401;]`os` imported but unused
+##vso[task.logissue type=error;sourcepath=[TMP]/input.py;linenumber=2;columnnumber=5;code=F821;]Undefined name `y`
+##vso[task.logissue type=error;sourcepath=[TMP]/input.py;linenumber=3;columnnumber=1;]SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_concise.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_concise.snap
@@ -0,0 +1,25 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - concise
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+input.py:1:8: F401 [*] `os` imported but unused
+input.py:2:5: F821 Undefined name `y`
+input.py:3:1: SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+Found 3 errors.
+[*] 1 fixable with the `--fix` option.
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_full.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_full.snap
@@ -0,0 +1,49 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - full
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+input.py:1:8: F401 [*] `os` imported but unused
+  |
+1 | import os  # F401
+  |        ^^ F401
+2 | x = y      # F821
+3 | match 42:  # invalid-syntax
+  |
+  = help: Remove unused import: `os`
+
+input.py:2:5: F821 Undefined name `y`
+  |
+1 | import os  # F401
+2 | x = y      # F821
+  |     ^ F821
+3 | match 42:  # invalid-syntax
+4 |     case _: ...
+  |
+
+input.py:3:1: SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+  |
+1 | import os  # F401
+2 | x = y      # F821
+3 | match 42:  # invalid-syntax
+  | ^^^^^
+4 |     case _: ...
+  |
+
+Found 3 errors.
+[*] 1 fixable with the `--fix` option.
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_github.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_github.snap
@@ -0,0 +1,23 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - github
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+::error title=Ruff (F401),file=[TMP]/input.py,line=1,col=8,endLine=1,endColumn=10::input.py:1:8: F401 `os` imported but unused
+::error title=Ruff (F821),file=[TMP]/input.py,line=2,col=5,endLine=2,endColumn=6::input.py:2:5: F821 Undefined name `y`
+::error title=Ruff,file=[TMP]/input.py,line=3,col=1,endLine=3,endColumn=6::input.py:3:1: SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_gitlab.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_gitlab.snap
@@ -0,0 +1,60 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - gitlab
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+[
+  {
+    "check_name": "F401",
+    "description": "`os` imported but unused",
+    "fingerprint": "4dbad37161e65c72",
+    "location": {
+      "lines": {
+        "begin": 1,
+        "end": 1
+      },
+      "path": "input.py"
+    },
+    "severity": "major"
+  },
+  {
+    "check_name": "F821",
+    "description": "Undefined name `y`",
+    "fingerprint": "7af59862a085230",
+    "location": {
+      "lines": {
+        "begin": 2,
+        "end": 2
+      },
+      "path": "input.py"
+    },
+    "severity": "major"
+  },
+  {
+    "check_name": "syntax-error",
+    "description": "Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)",
+    "fingerprint": "e558cec859bb66e8",
+    "location": {
+      "lines": {
+        "begin": 3,
+        "end": 3
+      },
+      "path": "input.py"
+    },
+    "severity": "major"
+  }
+]
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_grouped.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_grouped.snap
@@ -0,0 +1,27 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - grouped
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+input.py:
+  1:8 F401 [*] `os` imported but unused
+  2:5 F821 Undefined name `y`
+  3:1 SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+
+Found 3 errors.
+[*] 1 fixable with the `--fix` option.
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_json-lines.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_json-lines.snap
@@ -0,0 +1,23 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - json-lines
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+{"cell":null,"code":"F401","end_location":{"column":10,"row":1},"filename":"[TMP]/input.py","fix":{"applicability":"safe","edits":[{"content":"","end_location":{"column":1,"row":2},"location":{"column":1,"row":1}}],"message":"Remove unused import: `os`"},"location":{"column":8,"row":1},"message":"`os` imported but unused","noqa_row":1,"url":"https://docs.astral.sh/ruff/rules/unused-import"}
+{"cell":null,"code":"F821","end_location":{"column":6,"row":2},"filename":"[TMP]/input.py","fix":null,"location":{"column":5,"row":2},"message":"Undefined name `y`","noqa_row":2,"url":"https://docs.astral.sh/ruff/rules/undefined-name"}
+{"cell":null,"code":null,"end_location":{"column":6,"row":3},"filename":"[TMP]/input.py","fix":null,"location":{"column":1,"row":3},"message":"SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)","noqa_row":null,"url":null}
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_json.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_json.snap
@@ -0,0 +1,88 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - json
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+[
+  {
+    "cell": null,
+    "code": "F401",
+    "end_location": {
+      "column": 10,
+      "row": 1
+    },
+    "filename": "[TMP]/input.py",
+    "fix": {
+      "applicability": "safe",
+      "edits": [
+        {
+          "content": "",
+          "end_location": {
+            "column": 1,
+            "row": 2
+          },
+          "location": {
+            "column": 1,
+            "row": 1
+          }
+        }
+      ],
+      "message": "Remove unused import: `os`"
+    },
+    "location": {
+      "column": 8,
+      "row": 1
+    },
+    "message": "`os` imported but unused",
+    "noqa_row": 1,
+    "url": "https://docs.astral.sh/ruff/rules/unused-import"
+  },
+  {
+    "cell": null,
+    "code": "F821",
+    "end_location": {
+      "column": 6,
+      "row": 2
+    },
+    "filename": "[TMP]/input.py",
+    "fix": null,
+    "location": {
+      "column": 5,
+      "row": 2
+    },
+    "message": "Undefined name `y`",
+    "noqa_row": 2,
+    "url": "https://docs.astral.sh/ruff/rules/undefined-name"
+  },
+  {
+    "cell": null,
+    "code": null,
+    "end_location": {
+      "column": 6,
+      "row": 3
+    },
+    "filename": "[TMP]/input.py",
+    "fix": null,
+    "location": {
+      "column": 1,
+      "row": 3
+    },
+    "message": "SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)",
+    "noqa_row": null,
+    "url": null
+  }
+]
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_junit.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_junit.snap
@@ -0,0 +1,34 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - junit
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites name="ruff" tests="3" failures="3" errors="0">
+    <testsuite name="[TMP]/input.py" tests="3" disabled="0" errors="0" failures="3" package="org.ruff">
+        <testcase name="org.ruff.F401" classname="[TMP]/input" line="1" column="8">
+            <failure message="`os` imported but unused">line 1, col 8, `os` imported but unused</failure>
+        </testcase>
+        <testcase name="org.ruff.F821" classname="[TMP]/input" line="2" column="5">
+            <failure message="Undefined name `y`">line 2, col 5, Undefined name `y`</failure>
+        </testcase>
+        <testcase name="org.ruff" classname="[TMP]/input" line="3" column="1">
+            <failure message="SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)">line 3, col 1, SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)</failure>
+        </testcase>
+    </testsuite>
+</testsuites>
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_pylint.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_pylint.snap
@@ -0,0 +1,23 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - pylint
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+input.py:1: [F401] `os` imported but unused
+input.py:2: [F821] Undefined name `y`
+input.py:3: SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_rdjson.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_rdjson.snap
@@ -0,0 +1,103 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - rdjson
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+{
+  "diagnostics": [
+    {
+      "code": {
+        "url": "https://docs.astral.sh/ruff/rules/unused-import",
+        "value": "F401"
+      },
+      "location": {
+        "path": "[TMP]/input.py",
+        "range": {
+          "end": {
+            "column": 10,
+            "line": 1
+          },
+          "start": {
+            "column": 8,
+            "line": 1
+          }
+        }
+      },
+      "message": "`os` imported but unused",
+      "suggestions": [
+        {
+          "range": {
+            "end": {
+              "column": 1,
+              "line": 2
+            },
+            "start": {
+              "column": 1,
+              "line": 1
+            }
+          },
+          "text": ""
+        }
+      ]
+    },
+    {
+      "code": {
+        "url": "https://docs.astral.sh/ruff/rules/undefined-name",
+        "value": "F821"
+      },
+      "location": {
+        "path": "[TMP]/input.py",
+        "range": {
+          "end": {
+            "column": 6,
+            "line": 2
+          },
+          "start": {
+            "column": 5,
+            "line": 2
+          }
+        }
+      },
+      "message": "Undefined name `y`"
+    },
+    {
+      "code": {
+        "url": null,
+        "value": null
+      },
+      "location": {
+        "path": "[TMP]/input.py",
+        "range": {
+          "end": {
+            "column": 6,
+            "line": 3
+          },
+          "start": {
+            "column": 1,
+            "line": 3
+          }
+        }
+      },
+      "message": "SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)"
+    }
+  ],
+  "severity": "warning",
+  "source": {
+    "name": "ruff",
+    "url": "https://docs.astral.sh/ruff"
+  }
+}
+----- stderr -----
--- a/crates/ruff/tests/snapshots/lint__output_format_sarif.snap
+++ b/crates/ruff/tests/snapshots/lint__output_format_sarif.snap
@@ -0,0 +1,142 @@
+---
+source: crates/ruff/tests/lint.rs
+info:
+  program: ruff
+  args:
+    - check
+    - "--no-cache"
+    - "--output-format"
+    - sarif
+    - "--select"
+    - "F401,F821"
+    - "--target-version"
+    - py39
+    - input.py
+---
+success: false
+exit_code: 1
+----- stdout -----
+{
+  "$schema": "https://json.schemastore.org/sarif-2.1.0.json",
+  "runs": [
+    {
+      "results": [
+        {
+          "level": "error",
+          "locations": [
+            {
+              "physicalLocation": {
+                "artifactLocation": {
+                  "uri": "[TMP]/input.py"
+                },
+                "region": {
+                  "endColumn": 10,
+                  "endLine": 1,
+                  "startColumn": 8,
+                  "startLine": 1
+                }
+              }
+            }
+          ],
+          "message": {
+            "text": "`os` imported but unused"
+          },
+          "ruleId": "F401"
+        },
+        {
+          "level": "error",
+          "locations": [
+            {
+              "physicalLocation": {
+                "artifactLocation": {
+                  "uri": "[TMP]/input.py"
+                },
+                "region": {
+                  "endColumn": 6,
+                  "endLine": 2,
+                  "startColumn": 5,
+                  "startLine": 2
+                }
+              }
+            }
+          ],
+          "message": {
+            "text": "Undefined name `y`"
+          },
+          "ruleId": "F821"
+        },
+        {
+          "level": "error",
+          "locations": [
+            {
+              "physicalLocation": {
+                "artifactLocation": {
+                  "uri": "[TMP]/input.py"
+                },
+                "region": {
+                  "endColumn": 6,
+                  "endLine": 3,
+                  "startColumn": 1,
+                  "startLine": 3
+                }
+              }
+            }
+          ],
+          "message": {
+            "text": "SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)"
+          },
+          "ruleId": null
+        }
+      ],
+      "tool": {
+        "driver": {
+          "informationUri": "https://github.com/astral-sh/ruff",
+          "name": "ruff",
+          "rules": [
+            {
+              "fullDescription": {
+                "text": "## What it does\nChecks for unused imports.\n\n## Why is this bad?\nUnused imports add a performance overhead at runtime, and risk creating\nimport cycles. They also increase the cognitive load of reading the code.\n\nIf an import statement is used to check for the availability or existence\nof a module, consider using `importlib.util.find_spec` instead.\n\nIf an import statement is used to re-export a symbol as part of a module's\npublic interface, consider using a \"redundant\" import alias, which\ninstructs Ruff (and other tools) to respect the re-export, and avoid\nmarking it as unused, as in:\n\n```python\nfrom module import member as member\n```\n\nAlternatively, you can use `__all__` to declare a symbol as part of the module's\ninterface, as in:\n\n```python\n# __init__.py\nimport some_module\n\n__all__ = [\"some_module\"]\n```\n\n## Fix safety\n\nFixes to remove unused imports are safe, except in `__init__.py` files.\n\nApplying fixes to `__init__.py` files is currently in preview. The fix offered depends on the\ntype of the unused import. Ruff will suggest a safe fix to export first-party imports with\neither a redundant alias or, if already present in the file, an `__all__` entry. If multiple\n`__all__` declarations are present, Ruff will not offer a fix. Ruff will suggest an unsafe fix\nto remove third-party and standard library imports -- the fix is unsafe because the module's\ninterface changes.\n\n## Example\n\n```python\nimport numpy as np  # unused import\n\n\ndef area(radius):\n    return 3.14 * radius**2\n```\n\nUse instead:\n\n```python\ndef area(radius):\n    return 3.14 * radius**2\n```\n\nTo check the availability of a module, use `importlib.util.find_spec`:\n\n```python\nfrom importlib.util import find_spec\n\nif find_spec(\"numpy\") is not None:\n    print(\"numpy is installed\")\nelse:\n    print(\"numpy is not installed\")\n```\n\n## Preview\nWhen [preview](https://docs.astral.sh/ruff/preview/) is enabled,\nthe criterion for determining whether an import is first-party\nis stricter, which could affect the suggested fix. See [this FAQ section](https://docs.astral.sh/ruff/faq/#how-does-ruff-determine-which-of-my-imports-are-first-party-third-party-etc) for more details.\n\n## Options\n- `lint.ignore-init-module-imports`\n- `lint.pyflakes.allowed-unused-imports`\n\n## References\n- [Python documentation: `import`](https://docs.python.org/3/reference/simple_stmts.html#the-import-statement)\n- [Python documentation: `importlib.util.find_spec`](https://docs.python.org/3/library/importlib.html#importlib.util.find_spec)\n- [Typing documentation: interface conventions](https://typing.python.org/en/latest/source/libraries.html#library-interface-public-and-private-symbols)\n"
+              },
+              "help": {
+                "text": "`{name}` imported but unused; consider using `importlib.util.find_spec` to test for availability"
+              },
+              "helpUri": "https://docs.astral.sh/ruff/rules/unused-import",
+              "id": "F401",
+              "properties": {
+                "id": "F401",
+                "kind": "Pyflakes",
+                "name": "unused-import",
+                "problem.severity": "error"
+              },
+              "shortDescription": {
+                "text": "`{name}` imported but unused; consider using `importlib.util.find_spec` to test for availability"
+              }
+            },
+            {
+              "fullDescription": {
+                "text": "## What it does\nChecks for uses of undefined names.\n\n## Why is this bad?\nAn undefined name is likely to raise `NameError` at runtime.\n\n## Example\n```python\ndef double():\n    return n * 2  # raises `NameError` if `n` is undefined when `double` is called\n```\n\nUse instead:\n```python\ndef double(n):\n    return n * 2\n```\n\n## Options\n- [`target-version`]: Can be used to configure which symbols Ruff will understand\n  as being available in the `builtins` namespace.\n\n## References\n- [Python documentation: Naming and binding](https://docs.python.org/3/reference/executionmodel.html#naming-and-binding)\n"
+              },
+              "help": {
+                "text": "Undefined name `{name}`. {tip}"
+              },
+              "helpUri": "https://docs.astral.sh/ruff/rules/undefined-name",
+              "id": "F821",
+              "properties": {
+                "id": "F821",
+                "kind": "Pyflakes",
+                "name": "undefined-name",
+                "problem.severity": "error"
+              },
+              "shortDescription": {
+                "text": "Undefined name `{name}`. {tip}"
+              }
+            }
+          ],
+          "version": "[VERSION]"
+        }
+      }
+    }
+  ],
+  "version": "2.1.0"
+}
+----- stderr -----
--- a/crates/ruff/tests/version.rs
+++ b/crates/ruff/tests/version.rs
@@ -60,7 +60,7 @@ fn config_option_ignored_but_validated() {
        assert_cmd_snapshot!(
            Command::new(get_cargo_bin(BIN_NAME))
                .arg("version")
-                .args(["--config", "foo = bar"]), @r#"
+                .args(["--config", "foo = bar"]), @r"
        success: false
        exit_code: 2
        ----- stdout -----
@@ -77,12 +77,11 @@ fn config_option_ignored_but_validated() {
        TOML parse error at line 1, column 7
          |
        1 | foo = bar
-          |       ^
-        invalid string
-        expected `"`, `'`
+          |       ^^^
+        string values must be quoted, expected literal string

        For more information, try '--help'.
-        "#
+        "
        );
    });
 }
--- a/crates/ruff_db/Cargo.toml
+++ b/crates/ruff_db/Cargo.toml
@@ -38,6 +38,7 @@ rustc-hash = { workspace = true }
 salsa = { workspace = true }
 schemars = { workspace = true, optional = true }
 serde = { workspace = true, optional = true }
+serde_json = { workspace = true, optional = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }
 tracing-subscriber = { workspace = true, optional = true }
@@ -56,6 +57,6 @@ tempfile = { workspace = true }
 [features]
 cache = ["ruff_cache"]
 os = ["ignore", "dep:etcetera"]
-serde = ["dep:serde", "camino/serde1"]
+serde = ["camino/serde1", "dep:serde", "dep:serde_json", "ruff_diagnostics/serde"]
 # Exposes testing utilities.
 testing = ["tracing-subscriber"]
--- a/crates/ruff_db/src/diagnostic/mod.rs
+++ b/crates/ruff_db/src/diagnostic/mod.rs
@@ -1,13 +1,12 @@
 use std::{fmt::Formatter, sync::Arc};

-use render::{FileResolver, Input};
 use ruff_diagnostics::Fix;
 use ruff_source_file::{LineColumn, SourceCode, SourceFile};

 use ruff_annotate_snippets::Level as AnnotateLevel;
 use ruff_text_size::{Ranged, TextRange, TextSize};

-pub use self::render::DisplayDiagnostic;
+pub use self::render::{DisplayDiagnostic, DisplayDiagnostics, FileResolver, Input};
 use crate::{Db, files::File};

 mod render;
@@ -380,7 +379,7 @@ impl Diagnostic {
    }

    /// Returns the URL for the rule documentation, if it exists.
-    pub fn to_url(&self) -> Option<String> {
+    pub fn to_ruff_url(&self) -> Option<String> {
        if self.is_invalid_syntax() {
            None
        } else {
@@ -432,8 +431,9 @@ impl Diagnostic {
    /// Returns the [`SourceFile`] which the message belongs to.
    ///
    /// Panics if the diagnostic has no primary span, or if its file is not a `SourceFile`.
-    pub fn expect_ruff_source_file(&self) -> SourceFile {
-        self.expect_primary_span().expect_ruff_file().clone()
+    pub fn expect_ruff_source_file(&self) -> &SourceFile {
+        self.ruff_source_file()
+            .expect("Expected a ruff source file")
    }

    /// Returns the [`TextRange`] for the diagnostic.
@@ -1174,6 +1174,12 @@ pub struct DisplayDiagnosticConfig {
    /// here for now as the most "sensible" place for it to live until
    /// we had more concrete use cases. ---AG
    context: usize,
+    /// Whether to use preview formatting for Ruff diagnostics.
+    #[allow(
+        dead_code,
+        reason = "This is currently only used for JSON but will be needed soon for other formats"
+    )]
+    preview: bool,
 }

 impl DisplayDiagnosticConfig {
@@ -1194,6 +1200,14 @@ impl DisplayDiagnosticConfig {
            ..self
        }
    }
+
+    /// Whether to enable preview behavior or not.
+    pub fn preview(self, yes: bool) -> DisplayDiagnosticConfig {
+        DisplayDiagnosticConfig {
+            preview: yes,
+            ..self
+        }
+    }
 }

 impl Default for DisplayDiagnosticConfig {
@@ -1202,6 +1216,7 @@ impl Default for DisplayDiagnosticConfig {
            format: DiagnosticFormat::default(),
            color: false,
            context: 2,
+            preview: false,
        }
    }
 }
@@ -1229,6 +1244,21 @@ pub enum DiagnosticFormat {
    ///
    /// This may use color when printing to a `tty`.
    Concise,
+    /// Print diagnostics in the [Azure Pipelines] format.
+    ///
+    /// [Azure Pipelines]: https://learn.microsoft.com/en-us/azure/devops/pipelines/scripts/logging-commands?view=azure-devops&tabs=bash#logissue-log-an-error-or-warning
+    Azure,
+    /// Print diagnostics in JSON format.
+    ///
+    /// Unlike `json-lines`, this prints all of the diagnostics as a JSON array.
+    #[cfg(feature = "serde")]
+    Json,
+    /// Print diagnostics in JSON format, one per line.
+    ///
+    /// This will print each diagnostic as a separate JSON object on its own line. See the `json`
+    /// format for an array of all diagnostics. See <https://jsonlines.org/> for more details.
+    #[cfg(feature = "serde")]
+    JsonLines,
 }

 /// A representation of the kinds of messages inside a diagnostic.
--- a/crates/ruff_db/src/diagnostic/render.rs
+++ b/crates/ruff_db/src/diagnostic/render.rs
@@ -4,6 +4,7 @@ use ruff_annotate_snippets::{
    Annotation as AnnotateAnnotation, Level as AnnotateLevel, Message as AnnotateMessage,
    Renderer as AnnotateRenderer, Snippet as AnnotateSnippet,
 };
+use ruff_notebook::{Notebook, NotebookIndex};
 use ruff_source_file::{LineIndex, OneIndexed, SourceCode};
 use ruff_text_size::{TextRange, TextSize};

@@ -17,9 +18,17 @@ use crate::{

 use super::{
    Annotation, Diagnostic, DiagnosticFormat, DiagnosticSource, DisplayDiagnosticConfig, Severity,
-    SubDiagnostic,
+    SubDiagnostic, UnifiedFile,
 };

+use azure::AzureRenderer;
+
+mod azure;
+#[cfg(feature = "serde")]
+mod json;
+#[cfg(feature = "serde")]
+mod json_lines;
+
 /// A type that implements `std::fmt::Display` for diagnostic rendering.
 ///
 /// It is created via [`Diagnostic::display`].
@@ -34,7 +43,6 @@ use super::{
 pub struct DisplayDiagnostic<'a> {
    config: &'a DisplayDiagnosticConfig,
    resolver: &'a dyn FileResolver,
-    annotate_renderer: AnnotateRenderer,
    diag: &'a Diagnostic,
 }

@@ -44,16 +52,9 @@ impl<'a> DisplayDiagnostic<'a> {
        config: &'a DisplayDiagnosticConfig,
        diag: &'a Diagnostic,
    ) -> DisplayDiagnostic<'a> {
-        let annotate_renderer = if config.color {
-            AnnotateRenderer::styled()
-        } else {
-            AnnotateRenderer::plain()
-        };
-
        DisplayDiagnostic {
            config,
            resolver,
-            annotate_renderer,
            diag,
        }
    }
@@ -61,68 +62,131 @@ impl<'a> DisplayDiagnostic<'a> {

 impl std::fmt::Display for DisplayDiagnostic<'_> {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        let stylesheet = if self.config.color {
-            DiagnosticStylesheet::styled()
-        } else {
-            DiagnosticStylesheet::plain()
-        };
+        DisplayDiagnostics::new(self.resolver, self.config, std::slice::from_ref(self.diag)).fmt(f)
+    }
+}

-        if matches!(self.config.format, DiagnosticFormat::Concise) {
-            let (severity, severity_style) = match self.diag.severity() {
-                Severity::Info => ("info", stylesheet.info),
-                Severity::Warning => ("warning", stylesheet.warning),
-                Severity::Error => ("error", stylesheet.error),
-                Severity::Fatal => ("fatal", stylesheet.error),
-            };
+/// A type that implements `std::fmt::Display` for rendering a collection of diagnostics.
+///
+/// It is intended for collections of diagnostics that need to be serialized together, as is the
+/// case for JSON, for example.
+///
+/// See [`DisplayDiagnostic`] for rendering individual `Diagnostic`s and details about the lifetime
+/// constraints.
+pub struct DisplayDiagnostics<'a> {
+    config: &'a DisplayDiagnosticConfig,
+    resolver: &'a dyn FileResolver,
+    diagnostics: &'a [Diagnostic],
+}

-            write!(
-                f,
-                "{severity}[{id}]",
-                severity = fmt_styled(severity, severity_style),
-                id = fmt_styled(self.diag.id(), stylesheet.emphasis)
-            )?;
+impl<'a> DisplayDiagnostics<'a> {
+    pub fn new(
+        resolver: &'a dyn FileResolver,
+        config: &'a DisplayDiagnosticConfig,
+        diagnostics: &'a [Diagnostic],
+    ) -> DisplayDiagnostics<'a> {
+        DisplayDiagnostics {
+            config,
+            resolver,
+            diagnostics,
+        }
+    }
+}

-            if let Some(span) = self.diag.primary_span() {
-                write!(
-                    f,
-                    " {path}",
-                    path = fmt_styled(span.file().path(self.resolver), stylesheet.emphasis)
-                )?;
-                if let Some(range) = span.range() {
-                    let diagnostic_source = span.file().diagnostic_source(self.resolver);
-                    let start = diagnostic_source
-                        .as_source_code()
-                        .line_column(range.start());
+impl std::fmt::Display for DisplayDiagnostics<'_> {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self.config.format {
+            DiagnosticFormat::Concise => {
+                let stylesheet = if self.config.color {
+                    DiagnosticStylesheet::styled()
+                } else {
+                    DiagnosticStylesheet::plain()
+                };

+                for diag in self.diagnostics {
+                    let (severity, severity_style) = match diag.severity() {
+                        Severity::Info => ("info", stylesheet.info),
+                        Severity::Warning => ("warning", stylesheet.warning),
+                        Severity::Error => ("error", stylesheet.error),
+                        Severity::Fatal => ("fatal", stylesheet.error),
+                    };
                    write!(
                        f,
-                        ":{line}:{col}",
-                        line = fmt_styled(start.line, stylesheet.emphasis),
-                        col = fmt_styled(start.column, stylesheet.emphasis),
+                        "{severity}[{id}]",
+                        severity = fmt_styled(severity, severity_style),
+                        id = fmt_styled(diag.id(), stylesheet.emphasis)
                    )?;
+                    if let Some(span) = diag.primary_span() {
+                        write!(
+                            f,
+                            " {path}",
+                            path = fmt_styled(span.file().path(self.resolver), stylesheet.emphasis)
+                        )?;
+                        if let Some(range) = span.range() {
+                            let diagnostic_source = span.file().diagnostic_source(self.resolver);
+                            let start = diagnostic_source
+                                .as_source_code()
+                                .line_column(range.start());
+
+                            write!(
+                                f,
+                                ":{line}:{col}",
+                                line = fmt_styled(start.line, stylesheet.emphasis),
+                                col = fmt_styled(start.column, stylesheet.emphasis),
+                            )?;
+                        }
+                        write!(f, ":")?;
+                    }
+                    writeln!(f, " {message}", message = diag.concise_message())?;
                }
-                write!(f, ":")?;
            }
-            return writeln!(f, " {message}", message = self.diag.concise_message());
+            DiagnosticFormat::Full => {
+                let stylesheet = if self.config.color {
+                    DiagnosticStylesheet::styled()
+                } else {
+                    DiagnosticStylesheet::plain()
+                };
+
+                let mut renderer = if self.config.color {
+                    AnnotateRenderer::styled()
+                } else {
+                    AnnotateRenderer::plain()
+                };
+
+                renderer = renderer
+                    .error(stylesheet.error)
+                    .warning(stylesheet.warning)
+                    .info(stylesheet.info)
+                    .note(stylesheet.note)
+                    .help(stylesheet.help)
+                    .line_no(stylesheet.line_no)
+                    .emphasis(stylesheet.emphasis)
+                    .none(stylesheet.none);
+
+                for diag in self.diagnostics {
+                    let resolved = Resolved::new(self.resolver, diag);
+                    let renderable = resolved.to_renderable(self.config.context);
+                    for diag in renderable.diagnostics.iter() {
+                        writeln!(f, "{}", renderer.render(diag.to_annotate()))?;
+                    }
+                    writeln!(f)?;
+                }
+            }
+            DiagnosticFormat::Azure => {
+                AzureRenderer::new(self.resolver).render(f, self.diagnostics)?;
+            }
+            #[cfg(feature = "serde")]
+            DiagnosticFormat::Json => {
+                json::JsonRenderer::new(self.resolver, self.config).render(f, self.diagnostics)?;
+            }
+            #[cfg(feature = "serde")]
+            DiagnosticFormat::JsonLines => {
+                json_lines::JsonLinesRenderer::new(self.resolver, self.config)
+                    .render(f, self.diagnostics)?;
+            }
        }

-        let mut renderer = self.annotate_renderer.clone();
-        renderer = renderer
-            .error(stylesheet.error)
-            .warning(stylesheet.warning)
-            .info(stylesheet.info)
-            .note(stylesheet.note)
-            .help(stylesheet.help)
-            .line_no(stylesheet.line_no)
-            .emphasis(stylesheet.emphasis)
-            .none(stylesheet.none);
-
-        let resolved = Resolved::new(self.resolver, self.diag);
-        let renderable = resolved.to_renderable(self.config.context);
-        for diag in renderable.diagnostics.iter() {
-            writeln!(f, "{}", renderer.render(diag.to_annotate()))?;
-        }
-        writeln!(f)
+        Ok(())
    }
 }

@@ -635,6 +699,12 @@ pub trait FileResolver {

    /// Returns the input contents associated with the file given.
    fn input(&self, file: File) -> Input;
+
+    /// Returns the [`NotebookIndex`] associated with the file given, if it's a Jupyter notebook.
+    fn notebook_index(&self, file: &UnifiedFile) -> Option<NotebookIndex>;
+
+    /// Returns whether the file given is a Jupyter notebook.
+    fn is_notebook(&self, file: &UnifiedFile) -> bool;
 }

 impl<T> FileResolver for T
@@ -651,6 +721,25 @@ where
            line_index: line_index(self, file),
        }
    }
+
+    fn notebook_index(&self, file: &UnifiedFile) -> Option<NotebookIndex> {
+        match file {
+            UnifiedFile::Ty(file) => self
+                .input(*file)
+                .text
+                .as_notebook()
+                .map(Notebook::index)
+                .cloned(),
+            UnifiedFile::Ruff(_) => unimplemented!("Expected an interned ty file"),
+        }
+    }
+
+    fn is_notebook(&self, file: &UnifiedFile) -> bool {
+        match file {
+            UnifiedFile::Ty(file) => self.input(*file).text.as_notebook().is_some(),
+            UnifiedFile::Ruff(_) => unimplemented!("Expected an interned ty file"),
+        }
+    }
 }

 impl FileResolver for &dyn Db {
@@ -664,6 +753,25 @@ impl FileResolver for &dyn Db {
            line_index: line_index(*self, file),
        }
    }
+
+    fn notebook_index(&self, file: &UnifiedFile) -> Option<NotebookIndex> {
+        match file {
+            UnifiedFile::Ty(file) => self
+                .input(*file)
+                .text
+                .as_notebook()
+                .map(Notebook::index)
+                .cloned(),
+            UnifiedFile::Ruff(_) => unimplemented!("Expected an interned ty file"),
+        }
+    }
+
+    fn is_notebook(&self, file: &UnifiedFile) -> bool {
+        match file {
+            UnifiedFile::Ty(file) => self.input(*file).text.as_notebook().is_some(),
+            UnifiedFile::Ruff(_) => unimplemented!("Expected an interned ty file"),
+        }
+    }
 }

 /// An abstraction over a unit of user input.
@@ -724,7 +832,9 @@ fn relativize_path<'p>(cwd: &SystemPath, path: &'p str) -> &'p str {
 #[cfg(test)]
 mod tests {

-    use crate::diagnostic::{Annotation, DiagnosticId, Severity, Span};
+    use ruff_diagnostics::{Edit, Fix};
+
+    use crate::diagnostic::{Annotation, DiagnosticId, SecondaryCode, Severity, Span};
    use crate::files::system_path_to_file;
    use crate::system::{DbWithWritableSystem, SystemPath};
    use crate::tests::TestDb;
@@ -2121,7 +2231,7 @@ watermelon

    /// A small harness for setting up an environment specifically for testing
    /// diagnostic rendering.
-    struct TestEnvironment {
+    pub(super) struct TestEnvironment {
        db: TestDb,
        config: DisplayDiagnosticConfig,
    }
@@ -2130,7 +2240,7 @@ watermelon
        /// Create a new test harness.
        ///
        /// This uses the default diagnostic rendering configuration.
-        fn new() -> TestEnvironment {
+        pub(super) fn new() -> TestEnvironment {
            TestEnvironment {
                db: TestDb::new(),
                config: DisplayDiagnosticConfig::default(),
@@ -2149,8 +2259,26 @@ watermelon
            self.config = config;
        }

+        /// Set the output format to use in diagnostic rendering.
+        pub(super) fn format(&mut self, format: DiagnosticFormat) {
+            let mut config = std::mem::take(&mut self.config);
+            config = config.format(format);
+            self.config = config;
+        }
+
+        /// Enable preview functionality for diagnostic rendering.
+        #[allow(
+            dead_code,
+            reason = "This is currently only used for JSON but will be needed soon for other formats"
+        )]
+        pub(super) fn preview(&mut self, yes: bool) {
+            let mut config = std::mem::take(&mut self.config);
+            config = config.preview(yes);
+            self.config = config;
+        }
+
        /// Add a file with the given path and contents to this environment.
-        fn add(&mut self, path: &str, contents: &str) {
+        pub(super) fn add(&mut self, path: &str, contents: &str) {
            let path = SystemPath::new(path);
            self.db.write_file(path, contents).unwrap();
        }
@@ -2200,7 +2328,7 @@ watermelon
        /// A convenience function for returning a builder for a diagnostic
        /// with "error" severity and canned values for its identifier
        /// and message.
-        fn err(&mut self) -> DiagnosticBuilder<'_> {
+        pub(super) fn err(&mut self) -> DiagnosticBuilder<'_> {
            self.builder(
                "test-diagnostic",
                Severity::Error,
@@ -2226,6 +2354,12 @@ watermelon
            DiagnosticBuilder { env: self, diag }
        }

+        /// A convenience function for returning a builder for an invalid syntax diagnostic.
+        fn invalid_syntax(&mut self, message: &str) -> DiagnosticBuilder<'_> {
+            let diag = Diagnostic::new(DiagnosticId::InvalidSyntax, Severity::Error, message);
+            DiagnosticBuilder { env: self, diag }
+        }
+
        /// Returns a builder for tersely constructing sub-diagnostics.
        fn sub_builder(&mut self, severity: Severity, message: &str) -> SubDiagnosticBuilder<'_> {
            let subdiag = SubDiagnostic::new(severity, message);
@@ -2235,9 +2369,18 @@ watermelon
        /// Render the given diagnostic into a `String`.
        ///
        /// (This will set the "printed" flag on `Diagnostic`.)
-        fn render(&self, diag: &Diagnostic) -> String {
+        pub(super) fn render(&self, diag: &Diagnostic) -> String {
            diag.display(&self.db, &self.config).to_string()
        }
+
+        /// Render the given diagnostics into a `String`.
+        ///
+        /// See `render` for rendering a single diagnostic.
+        ///
+        /// (This will set the "printed" flag on `Diagnostic`.)
+        pub(super) fn render_diagnostics(&self, diagnostics: &[Diagnostic]) -> String {
+            DisplayDiagnostics::new(&self.db, &self.config, diagnostics).to_string()
+        }
    }

    /// A helper builder for tersely populating a `Diagnostic`.
@@ -2246,14 +2389,14 @@ watermelon
    /// supported by this builder, and this only needs to be done
    /// infrequently, consider doing it more verbosely on `diag`
    /// itself.
-    struct DiagnosticBuilder<'e> {
+    pub(super) struct DiagnosticBuilder<'e> {
        env: &'e mut TestEnvironment,
        diag: Diagnostic,
    }

    impl<'e> DiagnosticBuilder<'e> {
        /// Return the built diagnostic.
-        fn build(self) -> Diagnostic {
+        pub(super) fn build(self) -> Diagnostic {
            self.diag
        }

@@ -2302,6 +2445,25 @@ watermelon
            self.diag.annotate(ann);
            self
        }
+
+        /// Set the secondary code on the diagnostic.
+        fn secondary_code(mut self, secondary_code: &str) -> DiagnosticBuilder<'e> {
+            self.diag
+                .set_secondary_code(SecondaryCode::new(secondary_code.to_string()));
+            self
+        }
+
+        /// Set the fix on the diagnostic.
+        pub(super) fn fix(mut self, fix: Fix) -> DiagnosticBuilder<'e> {
+            self.diag.set_fix(fix);
+            self
+        }
+
+        /// Set the noqa offset on the diagnostic.
+        fn noqa_offset(mut self, noqa_offset: TextSize) -> DiagnosticBuilder<'e> {
+            self.diag.set_noqa_offset(noqa_offset);
+            self
+        }
    }

    /// A helper builder for tersely populating a `SubDiagnostic`.
@@ -2381,4 +2543,199 @@ watermelon
        let offset = TextSize::from(offset.parse::<u32>().unwrap());
        (line_number, Some(offset))
    }
+
+    /// Create Ruff-style diagnostics for testing the various output formats.
+    pub(crate) fn create_diagnostics(
+        format: DiagnosticFormat,
+    ) -> (TestEnvironment, Vec<Diagnostic>) {
+        let mut env = TestEnvironment::new();
+        env.add(
+            "fib.py",
+            r#"import os
+
+
+def fibonacci(n):
+    """Compute the nth number in the Fibonacci sequence."""
+    x = 1
+    if n == 0:
+        return 0
+    elif n == 1:
+        return 1
+    else:
+        return fibonacci(n - 1) + fibonacci(n - 2)
+"#,
+        );
+        env.add("undef.py", r"if a == 1: pass");
+        env.format(format);
+
+        let diagnostics = vec![
+            env.builder("unused-import", Severity::Error, "`os` imported but unused")
+                .primary("fib.py", "1:7", "1:9", "Remove unused import: `os`")
+                .secondary_code("F401")
+                .fix(Fix::unsafe_edit(Edit::range_deletion(TextRange::new(
+                    TextSize::from(0),
+                    TextSize::from(10),
+                ))))
+                .noqa_offset(TextSize::from(7))
+                .build(),
+            env.builder(
+                "unused-variable",
+                Severity::Error,
+                "Local variable `x` is assigned to but never used",
+            )
+            .primary(
+                "fib.py",
+                "6:4",
+                "6:5",
+                "Remove assignment to unused variable `x`",
+            )
+            .secondary_code("F841")
+            .fix(Fix::unsafe_edit(Edit::deletion(
+                TextSize::from(94),
+                TextSize::from(99),
+            )))
+            .noqa_offset(TextSize::from(94))
+            .build(),
+            env.builder("undefined-name", Severity::Error, "Undefined name `a`")
+                .primary("undef.py", "1:3", "1:4", "")
+                .secondary_code("F821")
+                .noqa_offset(TextSize::from(3))
+                .build(),
+        ];
+
+        (env, diagnostics)
+    }
+
+    /// Create Ruff-style syntax error diagnostics for testing the various output formats.
+    pub(crate) fn create_syntax_error_diagnostics(
+        format: DiagnosticFormat,
+    ) -> (TestEnvironment, Vec<Diagnostic>) {
+        let mut env = TestEnvironment::new();
+        env.add(
+            "syntax_errors.py",
+            r"from os import
+
+if call(foo
+    def bar():
+        pass
+",
+        );
+        env.format(format);
+
+        let diagnostics = vec![
+            env.invalid_syntax("SyntaxError: Expected one or more symbol names after import")
+                .primary("syntax_errors.py", "1:14", "1:15", "")
+                .build(),
+            env.invalid_syntax("SyntaxError: Expected ')', found newline")
+                .primary("syntax_errors.py", "3:11", "3:12", "")
+                .build(),
+        ];
+
+        (env, diagnostics)
+    }
+
+    /// Create Ruff-style diagnostics for testing the various output formats for a notebook.
+    #[allow(
+        dead_code,
+        reason = "This is currently only used for JSON but will be needed soon for other formats"
+    )]
+    pub(crate) fn create_notebook_diagnostics(
+        format: DiagnosticFormat,
+    ) -> (TestEnvironment, Vec<Diagnostic>) {
+        let mut env = TestEnvironment::new();
+        env.add(
+            "notebook.ipynb",
+            r##"
+        {
+ "cells": [
+  {
+   "cell_type": "code",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# cell 1\n",
+    "import os"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# cell 2\n",
+    "import math\n",
+    "\n",
+    "print('hello world')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# cell 3\n",
+    "def foo():\n",
+    "    print()\n",
+    "    x = 1\n"
+   ]
+  }
+ ],
+ "metadata": {},
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
+"##,
+        );
+        env.format(format);
+
+        let diagnostics = vec![
+            env.builder("unused-import", Severity::Error, "`os` imported but unused")
+                .primary("notebook.ipynb", "2:7", "2:9", "Remove unused import: `os`")
+                .secondary_code("F401")
+                .fix(Fix::safe_edit(Edit::range_deletion(TextRange::new(
+                    TextSize::from(9),
+                    TextSize::from(19),
+                ))))
+                .noqa_offset(TextSize::from(16))
+                .build(),
+            env.builder(
+                "unused-import",
+                Severity::Error,
+                "`math` imported but unused",
+            )
+            .primary(
+                "notebook.ipynb",
+                "4:7",
+                "4:11",
+                "Remove unused import: `math`",
+            )
+            .secondary_code("F401")
+            .fix(Fix::safe_edit(Edit::range_deletion(TextRange::new(
+                TextSize::from(28),
+                TextSize::from(40),
+            ))))
+            .noqa_offset(TextSize::from(35))
+            .build(),
+            env.builder(
+                "unused-variable",
+                Severity::Error,
+                "Local variable `x` is assigned to but never used",
+            )
+            .primary(
+                "notebook.ipynb",
+                "10:4",
+                "10:5",
+                "Remove assignment to unused variable `x`",
+            )
+            .secondary_code("F841")
+            .fix(Fix::unsafe_edit(Edit::range_deletion(TextRange::new(
+                TextSize::from(94),
+                TextSize::from(104),
+            ))))
+            .noqa_offset(TextSize::from(98))
+            .build(),
+        ];
+
+        (env, diagnostics)
+    }
 }
--- a/crates/ruff_db/src/diagnostic/render/azure.rs
+++ b/crates/ruff_db/src/diagnostic/render/azure.rs
@@ -0,0 +1,83 @@
+use ruff_source_file::LineColumn;
+
+use crate::diagnostic::{Diagnostic, Severity};
+
+use super::FileResolver;
+
+pub(super) struct AzureRenderer<'a> {
+    resolver: &'a dyn FileResolver,
+}
+
+impl<'a> AzureRenderer<'a> {
+    pub(super) fn new(resolver: &'a dyn FileResolver) -> Self {
+        Self { resolver }
+    }
+}
+
+impl AzureRenderer<'_> {
+    pub(super) fn render(
+        &self,
+        f: &mut std::fmt::Formatter,
+        diagnostics: &[Diagnostic],
+    ) -> std::fmt::Result {
+        for diag in diagnostics {
+            let severity = match diag.severity() {
+                Severity::Info | Severity::Warning => "warning",
+                Severity::Error | Severity::Fatal => "error",
+            };
+            write!(f, "##vso[task.logissue type={severity};")?;
+            if let Some(span) = diag.primary_span() {
+                let filename = span.file().path(self.resolver);
+                write!(f, "sourcepath={filename};")?;
+                if let Some(range) = span.range() {
+                    let location = if self.resolver.notebook_index(span.file()).is_some() {
+                        // We can't give a reasonable location for the structured formats,
+                        // so we show one that's clearly a fallback
+                        LineColumn::default()
+                    } else {
+                        span.file()
+                            .diagnostic_source(self.resolver)
+                            .as_source_code()
+                            .line_column(range.start())
+                    };
+                    write!(
+                        f,
+                        "linenumber={line};columnnumber={col};",
+                        line = location.line,
+                        col = location.column,
+                    )?;
+                }
+            }
+            writeln!(
+                f,
+                "{code}]{body}",
+                code = diag
+                    .secondary_code()
+                    .map_or_else(String::new, |code| format!("code={code};")),
+                body = diag.body(),
+            )?;
+        }
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::diagnostic::{
+        DiagnosticFormat,
+        render::tests::{create_diagnostics, create_syntax_error_diagnostics},
+    };
+
+    #[test]
+    fn output() {
+        let (env, diagnostics) = create_diagnostics(DiagnosticFormat::Azure);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn syntax_errors() {
+        let (env, diagnostics) = create_syntax_error_diagnostics(DiagnosticFormat::Azure);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+}
--- a/crates/ruff_db/src/diagnostic/render/json.rs
+++ b/crates/ruff_db/src/diagnostic/render/json.rs
@@ -0,0 +1,393 @@
+use serde::{Serialize, Serializer, ser::SerializeSeq};
+use serde_json::{Value, json};
+
+use ruff_diagnostics::{Applicability, Edit};
+use ruff_notebook::NotebookIndex;
+use ruff_source_file::{LineColumn, OneIndexed};
+use ruff_text_size::Ranged;
+
+use crate::diagnostic::{Diagnostic, DiagnosticSource, DisplayDiagnosticConfig, SecondaryCode};
+
+use super::FileResolver;
+
+pub(super) struct JsonRenderer<'a> {
+    resolver: &'a dyn FileResolver,
+    config: &'a DisplayDiagnosticConfig,
+}
+
+impl<'a> JsonRenderer<'a> {
+    pub(super) fn new(resolver: &'a dyn FileResolver, config: &'a DisplayDiagnosticConfig) -> Self {
+        Self { resolver, config }
+    }
+}
+
+impl JsonRenderer<'_> {
+    pub(super) fn render(
+        &self,
+        f: &mut std::fmt::Formatter,
+        diagnostics: &[Diagnostic],
+    ) -> std::fmt::Result {
+        write!(
+            f,
+            "{:#}",
+            diagnostics_to_json_value(diagnostics, self.resolver, self.config)
+        )
+    }
+}
+
+fn diagnostics_to_json_value<'a>(
+    diagnostics: impl IntoIterator<Item = &'a Diagnostic>,
+    resolver: &dyn FileResolver,
+    config: &DisplayDiagnosticConfig,
+) -> Value {
+    let values: Vec<_> = diagnostics
+        .into_iter()
+        .map(|diag| diagnostic_to_json(diag, resolver, config))
+        .collect();
+    json!(values)
+}
+
+pub(super) fn diagnostic_to_json<'a>(
+    diagnostic: &'a Diagnostic,
+    resolver: &'a dyn FileResolver,
+    config: &'a DisplayDiagnosticConfig,
+) -> JsonDiagnostic<'a> {
+    let span = diagnostic.primary_span_ref();
+    let filename = span.map(|span| span.file().path(resolver));
+    let range = span.and_then(|span| span.range());
+    let diagnostic_source = span.map(|span| span.file().diagnostic_source(resolver));
+    let source_code = diagnostic_source
+        .as_ref()
+        .map(|diagnostic_source| diagnostic_source.as_source_code());
+    let notebook_index = span.and_then(|span| resolver.notebook_index(span.file()));
+
+    let mut start_location = None;
+    let mut end_location = None;
+    let mut noqa_location = None;
+    let mut notebook_cell_index = None;
+    if let Some(source_code) = source_code {
+        noqa_location = diagnostic
+            .noqa_offset()
+            .map(|offset| source_code.line_column(offset));
+        if let Some(range) = range {
+            let mut start = source_code.line_column(range.start());
+            let mut end = source_code.line_column(range.end());
+            if let Some(notebook_index) = &notebook_index {
+                notebook_cell_index =
+                    Some(notebook_index.cell(start.line).unwrap_or(OneIndexed::MIN));
+                start = notebook_index.translate_line_column(&start);
+                end = notebook_index.translate_line_column(&end);
+                noqa_location =
+                    noqa_location.map(|location| notebook_index.translate_line_column(&location));
+            }
+            start_location = Some(start);
+            end_location = Some(end);
+        }
+    }
+
+    let fix = diagnostic.fix().map(|fix| JsonFix {
+        applicability: fix.applicability(),
+        message: diagnostic.suggestion(),
+        edits: ExpandedEdits {
+            edits: fix.edits(),
+            notebook_index,
+            config,
+            diagnostic_source,
+        },
+    });
+
+    // In preview, the locations and filename can be optional.
+    if config.preview {
+        JsonDiagnostic {
+            code: diagnostic.secondary_code(),
+            url: diagnostic.to_ruff_url(),
+            message: diagnostic.body(),
+            fix,
+            cell: notebook_cell_index,
+            location: start_location.map(JsonLocation::from),
+            end_location: end_location.map(JsonLocation::from),
+            filename,
+            noqa_row: noqa_location.map(|location| location.line),
+        }
+    } else {
+        JsonDiagnostic {
+            code: diagnostic.secondary_code(),
+            url: diagnostic.to_ruff_url(),
+            message: diagnostic.body(),
+            fix,
+            cell: notebook_cell_index,
+            location: Some(start_location.unwrap_or_default().into()),
+            end_location: Some(end_location.unwrap_or_default().into()),
+            filename: Some(filename.unwrap_or_default()),
+            noqa_row: noqa_location.map(|location| location.line),
+        }
+    }
+}
+
+struct ExpandedEdits<'a> {
+    edits: &'a [Edit],
+    notebook_index: Option<NotebookIndex>,
+    config: &'a DisplayDiagnosticConfig,
+    diagnostic_source: Option<DiagnosticSource>,
+}
+
+impl Serialize for ExpandedEdits<'_> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut s = serializer.serialize_seq(Some(self.edits.len()))?;
+
+        for edit in self.edits {
+            let (location, end_location) = if let Some(diagnostic_source) = &self.diagnostic_source
+            {
+                let source_code = diagnostic_source.as_source_code();
+                let mut location = source_code.line_column(edit.start());
+                let mut end_location = source_code.line_column(edit.end());
+
+                if let Some(notebook_index) = &self.notebook_index {
+                    // There exists a newline between each cell's source code in the
+                    // concatenated source code in Ruff. This newline doesn't actually
+                    // exists in the JSON source field.
+                    //
+                    // Now, certain edits may try to remove this newline, which means
+                    // the edit will spill over to the first character of the next cell.
+                    // If it does, we need to translate the end location to the last
+                    // character of the previous cell.
+                    match (
+                        notebook_index.cell(location.line),
+                        notebook_index.cell(end_location.line),
+                    ) {
+                        (Some(start_cell), Some(end_cell)) if start_cell != end_cell => {
+                            debug_assert_eq!(end_location.column.get(), 1);
+
+                            let prev_row = end_location.line.saturating_sub(1);
+                            end_location = LineColumn {
+                                line: notebook_index.cell_row(prev_row).unwrap_or(OneIndexed::MIN),
+                                column: source_code
+                                    .line_column(source_code.line_end_exclusive(prev_row))
+                                    .column,
+                            };
+                        }
+                        (Some(_), None) => {
+                            debug_assert_eq!(end_location.column.get(), 1);
+
+                            let prev_row = end_location.line.saturating_sub(1);
+                            end_location = LineColumn {
+                                line: notebook_index.cell_row(prev_row).unwrap_or(OneIndexed::MIN),
+                                column: source_code
+                                    .line_column(source_code.line_end_exclusive(prev_row))
+                                    .column,
+                            };
+                        }
+                        _ => {
+                            end_location = notebook_index.translate_line_column(&end_location);
+                        }
+                    }
+                    location = notebook_index.translate_line_column(&location);
+                }
+
+                (Some(location), Some(end_location))
+            } else {
+                (None, None)
+            };
+
+            // In preview, the locations can be optional.
+            let value = if self.config.preview {
+                JsonEdit {
+                    content: edit.content().unwrap_or_default(),
+                    location: location.map(JsonLocation::from),
+                    end_location: end_location.map(JsonLocation::from),
+                }
+            } else {
+                JsonEdit {
+                    content: edit.content().unwrap_or_default(),
+                    location: Some(location.unwrap_or_default().into()),
+                    end_location: Some(end_location.unwrap_or_default().into()),
+                }
+            };
+
+            s.serialize_element(&value)?;
+        }
+
+        s.end()
+    }
+}
+
+/// A serializable version of `Diagnostic`.
+///
+/// The `Old` variant only exists to preserve backwards compatibility. Both this and `JsonEdit`
+/// should become structs with the `New` definitions in a future Ruff release.
+#[derive(Serialize)]
+pub(crate) struct JsonDiagnostic<'a> {
+    cell: Option<OneIndexed>,
+    code: Option<&'a SecondaryCode>,
+    end_location: Option<JsonLocation>,
+    filename: Option<&'a str>,
+    fix: Option<JsonFix<'a>>,
+    location: Option<JsonLocation>,
+    message: &'a str,
+    noqa_row: Option<OneIndexed>,
+    url: Option<String>,
+}
+
+#[derive(Serialize)]
+struct JsonFix<'a> {
+    applicability: Applicability,
+    edits: ExpandedEdits<'a>,
+    message: Option<&'a str>,
+}
+
+#[derive(Serialize)]
+struct JsonLocation {
+    column: OneIndexed,
+    row: OneIndexed,
+}
+
+impl From<LineColumn> for JsonLocation {
+    fn from(location: LineColumn) -> Self {
+        JsonLocation {
+            row: location.line,
+            column: location.column,
+        }
+    }
+}
+
+#[derive(Serialize)]
+struct JsonEdit<'a> {
+    content: &'a str,
+    end_location: Option<JsonLocation>,
+    location: Option<JsonLocation>,
+}
+
+#[cfg(test)]
+mod tests {
+    use ruff_diagnostics::{Edit, Fix};
+    use ruff_text_size::TextSize;
+
+    use crate::diagnostic::{
+        DiagnosticFormat,
+        render::tests::{
+            TestEnvironment, create_diagnostics, create_notebook_diagnostics,
+            create_syntax_error_diagnostics,
+        },
+    };
+
+    #[test]
+    fn output() {
+        let (env, diagnostics) = create_diagnostics(DiagnosticFormat::Json);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn syntax_errors() {
+        let (env, diagnostics) = create_syntax_error_diagnostics(DiagnosticFormat::Json);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn notebook_output() {
+        let (env, diagnostics) = create_notebook_diagnostics(DiagnosticFormat::Json);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn missing_file_stable() {
+        let mut env = TestEnvironment::new();
+        env.format(DiagnosticFormat::Json);
+        env.preview(false);
+
+        let diag = env
+            .err()
+            .fix(Fix::safe_edit(Edit::insertion(
+                "edit".to_string(),
+                TextSize::from(0),
+            )))
+            .build();
+
+        insta::assert_snapshot!(
+            env.render(&diag),
+            @r#"
+        [
+          {
+            "cell": null,
+            "code": null,
+            "end_location": {
+              "column": 1,
+              "row": 1
+            },
+            "filename": "",
+            "fix": {
+              "applicability": "safe",
+              "edits": [
+                {
+                  "content": "edit",
+                  "end_location": {
+                    "column": 1,
+                    "row": 1
+                  },
+                  "location": {
+                    "column": 1,
+                    "row": 1
+                  }
+                }
+              ],
+              "message": null
+            },
+            "location": {
+              "column": 1,
+              "row": 1
+            },
+            "message": "main diagnostic message",
+            "noqa_row": null,
+            "url": "https://docs.astral.sh/ruff/rules/test-diagnostic"
+          }
+        ]
+        "#,
+        );
+    }
+
+    #[test]
+    fn missing_file_preview() {
+        let mut env = TestEnvironment::new();
+        env.format(DiagnosticFormat::Json);
+        env.preview(true);
+
+        let diag = env
+            .err()
+            .fix(Fix::safe_edit(Edit::insertion(
+                "edit".to_string(),
+                TextSize::from(0),
+            )))
+            .build();
+
+        insta::assert_snapshot!(
+            env.render(&diag),
+            @r#"
+        [
+          {
+            "cell": null,
+            "code": null,
+            "end_location": null,
+            "filename": null,
+            "fix": {
+              "applicability": "safe",
+              "edits": [
+                {
+                  "content": "edit",
+                  "end_location": null,
+                  "location": null
+                }
+              ],
+              "message": null
+            },
+            "location": null,
+            "message": "main diagnostic message",
+            "noqa_row": null,
+            "url": "https://docs.astral.sh/ruff/rules/test-diagnostic"
+          }
+        ]
+        "#,
+        );
+    }
+}
--- a/crates/ruff_db/src/diagnostic/render/json_lines.rs
+++ b/crates/ruff_db/src/diagnostic/render/json_lines.rs
@@ -0,0 +1,59 @@
+use crate::diagnostic::{Diagnostic, DisplayDiagnosticConfig, render::json::diagnostic_to_json};
+
+use super::FileResolver;
+
+pub(super) struct JsonLinesRenderer<'a> {
+    resolver: &'a dyn FileResolver,
+    config: &'a DisplayDiagnosticConfig,
+}
+
+impl<'a> JsonLinesRenderer<'a> {
+    pub(super) fn new(resolver: &'a dyn FileResolver, config: &'a DisplayDiagnosticConfig) -> Self {
+        Self { resolver, config }
+    }
+}
+
+impl JsonLinesRenderer<'_> {
+    pub(super) fn render(
+        &self,
+        f: &mut std::fmt::Formatter,
+        diagnostics: &[Diagnostic],
+    ) -> std::fmt::Result {
+        for diag in diagnostics {
+            writeln!(
+                f,
+                "{}",
+                serde_json::json!(diagnostic_to_json(diag, self.resolver, self.config))
+            )?;
+        }
+
+        Ok(())
+    }
+}
+#[cfg(test)]
+mod tests {
+    use crate::diagnostic::{
+        DiagnosticFormat,
+        render::tests::{
+            create_diagnostics, create_notebook_diagnostics, create_syntax_error_diagnostics,
+        },
+    };
+
+    #[test]
+    fn output() {
+        let (env, diagnostics) = create_diagnostics(DiagnosticFormat::JsonLines);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn syntax_errors() {
+        let (env, diagnostics) = create_syntax_error_diagnostics(DiagnosticFormat::JsonLines);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+
+    #[test]
+    fn notebook_output() {
+        let (env, diagnostics) = create_notebook_diagnostics(DiagnosticFormat::JsonLines);
+        insta::assert_snapshot!(env.render_diagnostics(&diagnostics));
+    }
+}
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderazuretests__output.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderazuretests__output.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/azure.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/azure.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 ##vso[task.logissue type=error;sourcepath=fib.py;linenumber=1;columnnumber=8;code=F401;]`os` imported but unused
 ##vso[task.logissue type=error;sourcepath=fib.py;linenumber=6;columnnumber=5;code=F841;]Local variable `x` is assigned to but never used
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderazuretests__syntax_errors.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderazuretests__syntax_errors.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/azure.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/azure.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 ##vso[task.logissue type=error;sourcepath=syntax_errors.py;linenumber=1;columnnumber=15;]SyntaxError: Expected one or more symbol names after import
 ##vso[task.logissue type=error;sourcepath=syntax_errors.py;linenumber=3;columnnumber=12;]SyntaxError: Expected ')', found newline
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__notebook_output.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__notebook_output.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/json.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 [
  {
@@ -84,8 +83,8 @@ snapshot_kind: text
        {
          "content": "",
          "end_location": {
-            "column": 10,
-            "row": 4
+            "column": 1,
+            "row": 5
          },
          "location": {
            "column": 1,
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__output.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__output.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/json.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 [
  {
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__syntax_errors.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrenderjsontests__syntax_errors.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/json.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 [
  {
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestsnotebook_output.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestsnotebook_output.snap
@@ -1,8 +1,7 @@
 ---
-source: crates/ruff_linter/src/message/json_lines.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json_lines.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 {"cell":1,"code":"F401","end_location":{"column":10,"row":2},"filename":"notebook.ipynb","fix":{"applicability":"safe","edits":[{"content":"","end_location":{"column":10,"row":2},"location":{"column":1,"row":2}}],"message":"Remove unused import: `os`"},"location":{"column":8,"row":2},"message":"`os` imported but unused","noqa_row":2,"url":"https://docs.astral.sh/ruff/rules/unused-import"}
 {"cell":2,"code":"F401","end_location":{"column":12,"row":2},"filename":"notebook.ipynb","fix":{"applicability":"safe","edits":[{"content":"","end_location":{"column":1,"row":3},"location":{"column":1,"row":2}}],"message":"Remove unused import: `math`"},"location":{"column":8,"row":2},"message":"`math` imported but unused","noqa_row":2,"url":"https://docs.astral.sh/ruff/rules/unused-import"}
-{"cell":3,"code":"F841","end_location":{"column":6,"row":4},"filename":"notebook.ipynb","fix":{"applicability":"unsafe","edits":[{"content":"","end_location":{"column":10,"row":4},"location":{"column":1,"row":4}}],"message":"Remove assignment to unused variable `x`"},"location":{"column":5,"row":4},"message":"Local variable `x` is assigned to but never used","noqa_row":4,"url":"https://docs.astral.sh/ruff/rules/unused-variable"}
+{"cell":3,"code":"F841","end_location":{"column":6,"row":4},"filename":"notebook.ipynb","fix":{"applicability":"unsafe","edits":[{"content":"","end_location":{"column":1,"row":5},"location":{"column":1,"row":4}}],"message":"Remove assignment to unused variable `x`"},"location":{"column":5,"row":4},"message":"Local variable `x` is assigned to but never used","noqa_row":4,"url":"https://docs.astral.sh/ruff/rules/unused-variable"}
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestsoutput.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestsoutput.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/json_lines.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json_lines.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 {"cell":null,"code":"F401","end_location":{"column":10,"row":1},"filename":"fib.py","fix":{"applicability":"unsafe","edits":[{"content":"","end_location":{"column":1,"row":2},"location":{"column":1,"row":1}}],"message":"Remove unused import: `os`"},"location":{"column":8,"row":1},"message":"`os` imported but unused","noqa_row":1,"url":"https://docs.astral.sh/ruff/rules/unused-import"}
 {"cell":null,"code":"F841","end_location":{"column":6,"row":6},"filename":"fib.py","fix":{"applicability":"unsafe","edits":[{"content":"","end_location":{"column":10,"row":6},"location":{"column":5,"row":6}}],"message":"Remove assignment to unused variable `x`"},"location":{"column":5,"row":6},"message":"Local variable `x` is assigned to but never used","noqa_row":6,"url":"https://docs.astral.sh/ruff/rules/unused-variable"}
--- a/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestssyntax_errors.snap
+++ b/crates/ruff_db/src/diagnostic/render/snapshots/ruff_dbdiagnosticrender__json_linestestssyntax_errors.snap
@@ -1,7 +1,6 @@
 ---
-source: crates/ruff_linter/src/message/json_lines.rs
-expression: content
-snapshot_kind: text
+source: crates/ruff_db/src/diagnostic/render/json_lines.rs
+expression: env.render_diagnostics(&diagnostics)
 ---
 {"cell":null,"code":null,"end_location":{"column":1,"row":2},"filename":"syntax_errors.py","fix":null,"location":{"column":15,"row":1},"message":"SyntaxError: Expected one or more symbol names after import","noqa_row":null,"url":null}
 {"cell":null,"code":null,"end_location":{"column":1,"row":4},"filename":"syntax_errors.py","fix":null,"location":{"column":12,"row":3},"message":"SyntaxError: Expected ')', found newline","noqa_row":null,"url":null}
--- a/crates/ruff_db/src/lib.rs
+++ b/crates/ruff_db/src/lib.rs
@@ -28,6 +28,21 @@ pub use web_time::{Instant, SystemTime, SystemTimeError};
 pub type FxDashMap<K, V> = dashmap::DashMap<K, V, BuildHasherDefault<FxHasher>>;
 pub type FxDashSet<K> = dashmap::DashSet<K, BuildHasherDefault<FxHasher>>;

+static VERSION: std::sync::OnceLock<String> = std::sync::OnceLock::new();
+
+/// Returns the version of the executing program if set.
+pub fn program_version() -> Option<&'static str> {
+    VERSION.get().map(|version| version.as_str())
+}
+
+/// Sets the version of the executing program.
+///
+/// ## Errors
+/// If the version has already been initialized (can only be set once).
+pub fn set_program_version(version: String) -> Result<(), String> {
+    VERSION.set(version)
+}
+
 /// Most basic database that gives access to files, the host system, source code, and parsed AST.
 #[salsa::db]
 pub trait Db: salsa::Database {
--- a/crates/ruff_db/src/vendored.rs
+++ b/crates/ruff_db/src/vendored.rs
@@ -21,6 +21,19 @@ type LockedZipArchive<'a> = MutexGuard<'a, VendoredZipArchive>;
 ///
 /// "Files" in the `VendoredFileSystem` are read-only and immutable.
 /// Directories are supported, but symlinks and hardlinks cannot exist.
+///
+/// # Path separators
+///
+/// At time of writing (2025-07-11), this implementation always uses `/` as a
+/// path separator, even in Windows environments where `\` is traditionally
+/// used as a file path separator. Namely, this is only currently used with zip
+/// files built by `crates/ty_vendored/build.rs`.
+///
+/// Callers using this may provide paths that use a `\` as a separator. It will
+/// be transparently normalized to `/`.
+///
+/// This is particularly important because the presence of a trailing separator
+/// in a zip file is conventionally used to indicate a directory entry.
 #[derive(Clone)]
 pub struct VendoredFileSystem {
    inner: Arc<Mutex<VendoredZipArchive>>,
@@ -115,6 +128,68 @@ impl VendoredFileSystem {
        read_to_string(self, path.as_ref())
    }

+    /// Read the direct children of the directory
+    /// identified by `path`.
+    ///
+    /// If `path` is not a directory, then this will
+    /// return an empty `Vec`.
+    pub fn read_directory(&self, dir: impl AsRef<VendoredPath>) -> Vec<DirectoryEntry> {
+        // N.B. We specifically do not return an iterator here to avoid
+        // holding a lock for the lifetime of the iterator returned.
+        // That is, it seems like a footgun to keep the zip archive
+        // locked during iteration, since the unit of work for each
+        // item in the iterator could be arbitrarily long. Allocating
+        // up front and stuffing all entries into it is probably the
+        // simplest solution and what we do here. If this becomes
+        // a problem, there are other strategies we could pursue.
+        // (Amortizing allocs, using a different synchronization
+        // behavior or even exposing additional APIs.) ---AG
+
+        fn read_directory(fs: &VendoredFileSystem, dir: &VendoredPath) -> Vec<DirectoryEntry> {
+            let mut normalized = NormalizedVendoredPath::from(dir);
+            if !normalized.as_str().ends_with('/') {
+                normalized = normalized.with_trailing_slash();
+            }
+            let archive = fs.lock_archive();
+            let mut entries = vec![];
+            for name in archive.0.file_names() {
+                // Any entry that doesn't have the `path` (with a
+                // trailing slash) as a prefix cannot possibly be in
+                // the directory referenced by `path`.
+                let Some(without_dir_prefix) = name.strip_prefix(normalized.as_str()) else {
+                    continue;
+                };
+                // Filter out an entry equivalent to the path given
+                // since we only want children of the directory.
+                if without_dir_prefix.is_empty() {
+                    continue;
+                }
+                // We only want *direct* children. Files that are
+                // direct children cannot have any slashes (or else
+                // they are not direct children). Directories that
+                // are direct children can only have one slash and
+                // it must be at the end.
+                //
+                // (We do this manually ourselves to avoid doing a
+                // full file lookup and metadata retrieval via the
+                // `zip` crate.)
+                let file_type = FileType::from_zip_file_name(without_dir_prefix);
+                let slash_count = without_dir_prefix.matches('/').count();
+                match file_type {
+                    FileType::File if slash_count > 0 => continue,
+                    FileType::Directory if slash_count > 1 => continue,
+                    _ => {}
+                }
+                entries.push(DirectoryEntry {
+                    path: VendoredPathBuf::from(name),
+                    file_type,
+                });
+            }
+            entries
+        }
+        read_directory(self, dir.as_ref())
+    }
+
    /// Acquire a lock on the underlying zip archive.
    /// The call will block until it is able to acquire the lock.
    ///
@@ -206,6 +281,14 @@ pub enum FileType {
 }

 impl FileType {
+    fn from_zip_file_name(name: &str) -> FileType {
+        if name.ends_with('/') {
+            FileType::Directory
+        } else {
+            FileType::File
+        }
+    }
+
    pub const fn is_file(self) -> bool {
        matches!(self, Self::File)
    }
@@ -244,6 +327,30 @@ impl Metadata {
    }
 }

+#[derive(Debug, PartialEq, Eq)]
+pub struct DirectoryEntry {
+    path: VendoredPathBuf,
+    file_type: FileType,
+}
+
+impl DirectoryEntry {
+    pub fn new(path: VendoredPathBuf, file_type: FileType) -> Self {
+        Self { path, file_type }
+    }
+
+    pub fn into_path(self) -> VendoredPathBuf {
+        self.path
+    }
+
+    pub fn path(&self) -> &VendoredPath {
+        &self.path
+    }
+
+    pub fn file_type(&self) -> FileType {
+        self.file_type
+    }
+}
+
 /// Newtype wrapper around a ZipArchive.
 #[derive(Debug)]
 struct VendoredZipArchive(ZipArchive<io::Cursor<Cow<'static, [u8]>>>);
@@ -498,6 +605,60 @@ pub(crate) mod tests {
        test_directory("./stdlib/asyncio/../asyncio/")
    }

+    fn readdir_snapshot(fs: &VendoredFileSystem, path: &str) -> String {
+        let mut paths = fs
+            .read_directory(VendoredPath::new(path))
+            .into_iter()
+            .map(|entry| entry.path().to_string())
+            .collect::<Vec<String>>();
+        paths.sort();
+        paths.join("\n")
+    }
+
+    #[test]
+    fn read_directory_stdlib() {
+        let mock_typeshed = mock_typeshed();
+
+        assert_snapshot!(readdir_snapshot(&mock_typeshed, "stdlib"), @r"
+        vendored://stdlib/asyncio/
+        vendored://stdlib/functools.pyi
+        ");
+        assert_snapshot!(readdir_snapshot(&mock_typeshed, "stdlib/"), @r"
+        vendored://stdlib/asyncio/
+        vendored://stdlib/functools.pyi
+        ");
+        assert_snapshot!(readdir_snapshot(&mock_typeshed, "./stdlib"), @r"
+        vendored://stdlib/asyncio/
+        vendored://stdlib/functools.pyi
+        ");
+        assert_snapshot!(readdir_snapshot(&mock_typeshed, "./stdlib/"), @r"
+        vendored://stdlib/asyncio/
+        vendored://stdlib/functools.pyi
+        ");
+    }
+
+    #[test]
+    fn read_directory_asyncio() {
+        let mock_typeshed = mock_typeshed();
+
+        assert_snapshot!(
+            readdir_snapshot(&mock_typeshed, "stdlib/asyncio"),
+            @"vendored://stdlib/asyncio/tasks.pyi",
+        );
+        assert_snapshot!(
+            readdir_snapshot(&mock_typeshed, "./stdlib/asyncio"),
+            @"vendored://stdlib/asyncio/tasks.pyi",
+        );
+        assert_snapshot!(
+            readdir_snapshot(&mock_typeshed, "stdlib/asyncio/"),
+            @"vendored://stdlib/asyncio/tasks.pyi",
+        );
+        assert_snapshot!(
+            readdir_snapshot(&mock_typeshed, "./stdlib/asyncio/"),
+            @"vendored://stdlib/asyncio/tasks.pyi",
+        );
+    }
+
    fn test_nonexistent_path(path: &str) {
        let mock_typeshed = mock_typeshed();
        let path = VendoredPath::new(path);
--- a/crates/ruff_db/src/vendored/path.rs
+++ b/crates/ruff_db/src/vendored/path.rs
@@ -17,6 +17,10 @@ impl VendoredPath {
        unsafe { &*(path as *const Utf8Path as *const VendoredPath) }
    }

+    pub fn file_name(&self) -> Option<&str> {
+        self.0.file_name()
+    }
+
    pub fn to_path_buf(&self) -> VendoredPathBuf {
        VendoredPathBuf(self.0.to_path_buf())
    }
--- a/crates/ruff_linter/Cargo.toml
+++ b/crates/ruff_linter/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruff_linter"
-version = "0.12.2"
+version = "0.12.3"
 publish = false
 authors = { workspace = true }
 edition = { workspace = true }
--- a/crates/ruff_linter/resources/test/fixtures/flake8_bugbear/B017_0.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_bugbear/B017_0.py
@@ -1,6 +1,6 @@
 """
 Should emit:
-B017 - on lines 24, 28, 46, 49, 52, and 58
+B017 - on lines 24, 28, 46, 49, 52, 58, 62, 68, and 71
 """
 import asyncio
 import unittest
@@ -56,3 +56,17 @@ def test_pytest_raises():

    with contextlib.nullcontext(), pytest.raises(Exception):
        raise ValueError("Multiple context managers")
+
+
+def test_pytest_raises_keyword():
+    with pytest.raises(expected_exception=Exception):
+        raise ValueError("Should be flagged")
+
+def test_assert_raises_keyword():
+    class TestKwargs(unittest.TestCase):
+        def test_method(self):
+            with self.assertRaises(exception=Exception):
+                raise ValueError("Should be flagged")
+
+            with self.assertRaises(exception=BaseException):
+                raise ValueError("Should be flagged")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_django/DJ008.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_django/DJ008.py
@@ -181,3 +181,51 @@ class SubclassTestModel2(TestModel4):
 # Subclass without __str__
 class SubclassTestModel3(TestModel1):
    pass
+
+
+# Test cases for type-annotated abstract models - these should NOT trigger DJ008
+from typing import ClassVar
+from django_stubs_ext.db.models import TypedModelMeta
+
+
+class TypeAnnotatedAbstractModel1(models.Model):
+    """Model with type-annotated abstract = True - should not trigger DJ008"""
+    new_field = models.CharField(max_length=10)
+
+    class Meta(TypedModelMeta):
+        abstract: ClassVar[bool] = True
+
+
+class TypeAnnotatedAbstractModel2(models.Model):
+    """Model with type-annotated abstract = True using regular Meta - should not trigger DJ008"""  
+    new_field = models.CharField(max_length=10)
+
+    class Meta:
+        abstract: ClassVar[bool] = True
+
+
+class TypeAnnotatedAbstractModel3(models.Model):
+    """Model with type-annotated abstract = True but without ClassVar - should not trigger DJ008"""
+    new_field = models.CharField(max_length=10)
+
+    class Meta:
+        abstract: bool = True
+
+
+class TypeAnnotatedNonAbstractModel(models.Model):
+    """Model with type-annotated abstract = False - should trigger DJ008"""
+    new_field = models.CharField(max_length=10)
+
+    class Meta:
+        abstract: ClassVar[bool] = False
+
+
+class TypeAnnotatedAbstractModelWithStr(models.Model):
+    """Model with type-annotated abstract = True and __str__ method - should not trigger DJ008"""
+    new_field = models.CharField(max_length=10)
+
+    class Meta(TypedModelMeta):
+        abstract: ClassVar[bool] = True
+
+    def __str__(self):
+        return self.new_field
--- a/crates/ruff_linter/resources/test/fixtures/flake8_gettext/INT001.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_gettext/INT001.py
@@ -1 +1,4 @@
 _(f"{'value'}")
+
+# Don't trigger for t-strings
+_(t"{'value'}")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_logging_format/G004.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_logging_format/G004.py
@@ -13,3 +13,7 @@ from logging import info

 info(f"{name}")
 info(f"{__name__}")
+
+# Don't trigger for t-strings
+info(t"{name}")
+info(t"{__name__}")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT011.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT011.py
@@ -47,3 +47,7 @@ def test_error_match_is_empty():

    with pytest.raises(ValueError, match=f""):
        raise ValueError("Can't divide 1 by 0")
+
+def test_ok_t_string_match():
+    with pytest.raises(ValueError, match=t""):
+        raise ValueError("Can't divide 1 by 0")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT016.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT016.py
@@ -23,3 +23,9 @@ def f():
    pytest.fail(msg=f"")
    pytest.fail(reason="")
    pytest.fail(reason=f"")
+
+# Skip for t-strings
+def g():
+    pytest.fail(t"")
+    pytest.fail(msg=t"")
+    pytest.fail(reason=t"")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT030.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT030.py
@@ -32,3 +32,7 @@ def test_error_match_is_empty():

    with pytest.warns(UserWarning, match=f""):
        pass
+
+def test_ok_match_t_string():
+    with pytest.warns(UserWarning, match=t""):
+        pass
--- a/crates/ruff_linter/resources/test/fixtures/flake8_return/RET504.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_return/RET504.py
@@ -422,6 +422,35 @@ def func(a: dict[str, int]) -> list[dict[str, int]]:
        services = a["services"]
        return services

+
+# See: https://github.com/astral-sh/ruff/issues/14052
+def outer() -> list[object]:
+    @register
+    async def inner() -> None:
+        print(layout)
+
+    layout = [...]
+    return layout
+
+def outer() -> list[object]:
+    with open("") as f:
+        async def inner() -> None:
+            print(layout)
+
+    layout = [...]
+    return layout
+
+
+def outer() -> list[object]:
+    def inner():
+        with open("") as f:
+            async def inner_inner() -> None:
+                print(layout)
+
+    layout = [...]
+    return layout
+
+
 # See: https://github.com/astral-sh/ruff/issues/18411
 def f():
    (#=
--- a/crates/ruff_linter/resources/test/fixtures/flake8_type_checking/whitespace.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_type_checking/whitespace.py
@@ -0,0 +1,6 @@
+# Regression test for: https://github.com/astral-sh/ruff/issues/19175
+# there is a (potentially invisible) unicode formfeed character (000C) between `TYPE_CHECKING` and the backslash
+from typing import TYPE_CHECKING\
+
+if TYPE_CHECKING: import builtins
+builtins.print("!")
--- a/crates/ruff_linter/resources/test/fixtures/flake8_unused_arguments/ARG.py
+++ b/crates/ruff_linter/resources/test/fixtures/flake8_unused_arguments/ARG.py
@@ -245,3 +245,14 @@ def f(bar: str):
 class C:
    def __init__(self, x) -> None:
        print(locals())
+
+###
+# Should trigger for t-string here
+# even though the corresponding f-string
+# does not trigger (since it is common in stubs)
+###
+class C:
+    def f(self, x, y):
+        """Docstring."""
+        msg = t"{x}..."
+        raise NotImplementedError(msg)
--- a/crates/ruff_linter/resources/test/fixtures/isort/required_imports/multiple_strings.py
+++ b/crates/ruff_linter/resources/test/fixtures/isort/required_imports/multiple_strings.py
@@ -0,0 +1,5 @@
+"""This is a docstring."""
+"This is not a docstring."
+"This is also not a docstring."
+
+x = 1 
--- a/crates/ruff_linter/resources/test/fixtures/pep8_naming/N802.py
+++ b/crates/ruff_linter/resources/test/fixtures/pep8_naming/N802.py
@@ -48,6 +48,39 @@ from typing import override, overload
 def BAD_FUNC():
    pass

+
@overload
 def BAD_FUNC():
    pass
+
+
+import ast
+from ast import NodeTransformer
+
+
+class Visitor(ast.NodeVisitor):
+    def visit_Constant(self, node):
+        pass
+
+    def bad_Name(self):
+        pass
+
+class ExtendsVisitor(Visitor):
+    def visit_Constant(self, node):
+        pass
+
+class Transformer(NodeTransformer):
+    def visit_Constant(self, node):
+        pass
+
+
+from http.server import BaseHTTPRequestHandler
+
+
+class MyRequestHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        pass
+
+    def dont_GET(self):
+        pass
+
--- a/crates/ruff_linter/resources/test/fixtures/pylint/assert_on_string_literal.py
+++ b/crates/ruff_linter/resources/test/fixtures/pylint/assert_on_string_literal.py
@@ -22,3 +22,10 @@ assert b"hello"  # [assert-on-string-literal]
 assert "", b"hi"  # [assert-on-string-literal]
 assert "WhyNotHere?", "HereIsOk"  # [assert-on-string-literal]
 assert 12, "ok here"
+
+
+# t-strings are always True even when "empty"
+# skip lint in this case
+assert t""
+assert t"hey"
+assert t"{a}"
--- a/crates/ruff_linter/resources/test/fixtures/pylint/no_self_use.py
+++ b/crates/ruff_linter/resources/test/fixtures/pylint/no_self_use.py
@@ -140,3 +140,15 @@ class Foo:
    def unused_message_2(self, x):
        msg = ""
        raise NotImplementedError(x)
+
+class TPerson:
+    def developer_greeting(self, name):  # [no-self-use]
+        print(t"Greetings {name}!")
+
+    def greeting_1(self):
+        print(t"Hello from {self.name} !")
+
+    def tstring(self, x):
+        msg = t"{x}"
+        raise NotImplementedError(msg)
+
--- a/crates/ruff_linter/resources/test/fixtures/pylint/single_string_slots.py
+++ b/crates/ruff_linter/resources/test/fixtures/pylint/single_string_slots.py
@@ -33,3 +33,11 @@ class Foo:

    def __init__(self, bar):
        self.bar = bar
+
+# This is a type error, out of scope for the rule
+class Foo:
+    __slots__ = t"bar{baz}"
+
+    def __init__(self, bar):
+        self.bar = bar
+
--- a/crates/ruff_linter/resources/test/fixtures/pyupgrade/UP012.py
+++ b/crates/ruff_linter/resources/test/fixtures/pyupgrade/UP012.py
@@ -84,3 +84,7 @@ def _match_ignore(line):
 # Not a valid type annotation but this test shouldn't result in a panic.
 # Refer: https://github.com/astral-sh/ruff/issues/11736
 x: '"foo".encode("utf-8")'
+
+# AttributeError for t-strings so skip lint
+(t"foo{bar}").encode("utf-8")
+(t"foo{bar}").encode(encoding="utf-8")
--- a/crates/ruff_linter/resources/test/fixtures/pyupgrade/UP018.py
+++ b/crates/ruff_linter/resources/test/fixtures/pyupgrade/UP018.py
@@ -90,3 +90,7 @@ bool(True)and None
 int(1)and None
 float(1.)and None
 bool(True)and()
+
+
+# t-strings are not native literals
+str(t"hey")
--- a/crates/ruff_linter/src/checkers/ast/analyze/bindings.rs
+++ b/crates/ruff_linter/src/checkers/ast/analyze/bindings.rs
@@ -4,8 +4,8 @@ use crate::Fix;
 use crate::checkers::ast::Checker;
 use crate::codes::Rule;
 use crate::rules::{
-    flake8_import_conventions, flake8_pyi, flake8_pytest_style, flake8_type_checking, pyflakes,
-    pylint, pyupgrade, refurb, ruff,
+    flake8_import_conventions, flake8_pyi, flake8_pytest_style, flake8_return,
+    flake8_type_checking, pyflakes, pylint, pyupgrade, refurb, ruff,
 };

 /// Run lint rules over the [`Binding`]s.
@@ -25,11 +25,20 @@ pub(crate) fn bindings(checker: &Checker) {
        Rule::ForLoopWrites,
        Rule::CustomTypeVarForSelf,
        Rule::PrivateTypeParameter,
+        Rule::UnnecessaryAssign,
    ]) {
        return;
    }

    for (binding_id, binding) in checker.semantic.bindings.iter_enumerated() {
+        if checker.is_rule_enabled(Rule::UnnecessaryAssign) {
+            if binding.kind.is_function_definition() {
+                flake8_return::rules::unnecessary_assign(
+                    checker,
+                    binding.statement(checker.semantic()).unwrap(),
+                );
+            }
+        }
        if checker.is_rule_enabled(Rule::UnusedVariable) {
            if binding.kind.is_bound_exception()
                && binding.is_unused()
--- a/crates/ruff_linter/src/checkers/ast/analyze/statement.rs
+++ b/crates/ruff_linter/src/checkers/ast/analyze/statement.rs
@@ -207,7 +207,6 @@ pub(crate) fn statement(stmt: &Stmt, checker: &mut Checker) {
                Rule::UnnecessaryReturnNone,
                Rule::ImplicitReturnValue,
                Rule::ImplicitReturn,
-                Rule::UnnecessaryAssign,
                Rule::SuperfluousElseReturn,
                Rule::SuperfluousElseRaise,
                Rule::SuperfluousElseContinue,
--- a/crates/ruff_linter/src/checkers/ast/mod.rs
+++ b/crates/ruff_linter/src/checkers/ast/mod.rs
@@ -670,7 +670,11 @@ impl SemanticSyntaxContext for Checker<'_> {
            | SemanticSyntaxErrorKind::InvalidStarExpression
            | SemanticSyntaxErrorKind::AsyncComprehensionInSyncComprehension(_)
            | SemanticSyntaxErrorKind::DuplicateParameter(_)
-            | SemanticSyntaxErrorKind::NonlocalDeclarationAtModuleLevel => {
+            | SemanticSyntaxErrorKind::NonlocalDeclarationAtModuleLevel
+            | SemanticSyntaxErrorKind::LoadBeforeNonlocalDeclaration { .. }
+            | SemanticSyntaxErrorKind::NonlocalAndGlobal(_)
+            | SemanticSyntaxErrorKind::AnnotatedGlobal(_)
+            | SemanticSyntaxErrorKind::AnnotatedNonlocal(_) => {
                self.semantic_errors.borrow_mut().push(error);
            }
        }
--- a/crates/ruff_linter/src/importer/insertion.rs
+++ b/crates/ruff_linter/src/importer/insertion.rs
@@ -5,6 +5,7 @@ use ruff_python_ast::Stmt;
 use ruff_python_ast::helpers::is_docstring_stmt;
 use ruff_python_codegen::Stylist;
 use ruff_python_parser::{TokenKind, Tokens};
+use ruff_python_trivia::is_python_whitespace;
 use ruff_python_trivia::{PythonWhitespace, textwrap::indent};
 use ruff_source_file::{LineRanges, UniversalNewlineIterator};
 use ruff_text_size::{Ranged, TextSize};
@@ -274,19 +275,12 @@ impl<'a> Insertion<'a> {
    }
 }

-/// Find the end of the last docstring.
+/// Find the end of the docstring (first string statement).
 fn match_docstring_end(body: &[Stmt]) -> Option<TextSize> {
-    let mut iter = body.iter();
-    let mut stmt = iter.next()?;
+    let stmt = body.first()?;
    if !is_docstring_stmt(stmt) {
        return None;
    }
-    for next in iter {
-        if !is_docstring_stmt(next) {
-            break;
-        }
-        stmt = next;
-    }
    Some(stmt.end())
 }

@@ -306,7 +300,7 @@ fn match_semicolon(s: &str) -> Option<TextSize> {
 fn match_continuation(s: &str) -> Option<TextSize> {
    for (offset, c) in s.char_indices() {
        match c {
-            ' ' | '\t' => continue,
+            _ if is_python_whitespace(c) => continue,
            '\\' => return Some(TextSize::try_from(offset).unwrap()),
            _ => break,
        }
@@ -366,7 +360,7 @@ mod tests {
        .trim_start();
        assert_eq!(
            insert(contents)?,
-            Insertion::own_line("", TextSize::from(40), "\n")
+            Insertion::own_line("", TextSize::from(20), "\n")
        );

        let contents = r"
--- a/crates/ruff_linter/src/message/azure.rs
+++ b/crates/ruff_linter/src/message/azure.rs
@@ -1,71 +0,0 @@
-use std::io::Write;
-
-use ruff_db::diagnostic::Diagnostic;
-use ruff_source_file::LineColumn;
-
-use crate::message::{Emitter, EmitterContext};
-
-/// Generate error logging commands for Azure Pipelines format.
-/// See [documentation](https://learn.microsoft.com/en-us/azure/devops/pipelines/scripts/logging-commands?view=azure-devops&tabs=bash#logissue-log-an-error-or-warning)
-#[derive(Default)]
-pub struct AzureEmitter;
-
-impl Emitter for AzureEmitter {
-    fn emit(
-        &mut self,
-        writer: &mut dyn Write,
-        diagnostics: &[Diagnostic],
-        context: &EmitterContext,
-    ) -> anyhow::Result<()> {
-        for diagnostic in diagnostics {
-            let filename = diagnostic.expect_ruff_filename();
-            let location = if context.is_notebook(&filename) {
-                // We can't give a reasonable location for the structured formats,
-                // so we show one that's clearly a fallback
-                LineColumn::default()
-            } else {
-                diagnostic.expect_ruff_start_location()
-            };
-
-            writeln!(
-                writer,
-                "##vso[task.logissue type=error\
-                        ;sourcepath={filename};linenumber={line};columnnumber={col};{code}]{body}",
-                line = location.line,
-                col = location.column,
-                code = diagnostic
-                    .secondary_code()
-                    .map_or_else(String::new, |code| format!("code={code};")),
-                body = diagnostic.body(),
-            )?;
-        }
-
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use insta::assert_snapshot;
-
-    use crate::message::AzureEmitter;
-    use crate::message::tests::{
-        capture_emitter_output, create_diagnostics, create_syntax_error_diagnostics,
-    };
-
-    #[test]
-    fn output() {
-        let mut emitter = AzureEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_diagnostics());
-
-        assert_snapshot!(content);
-    }
-
-    #[test]
-    fn syntax_errors() {
-        let mut emitter = AzureEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_syntax_error_diagnostics());
-
-        assert_snapshot!(content);
-    }
-}
--- a/crates/ruff_linter/src/message/diff.rs
+++ b/crates/ruff_linter/src/message/diff.rs
@@ -21,7 +21,7 @@ use crate::{Applicability, Fix};
 /// * Compute the diff from the [`Edit`] because diff calculation is expensive.
 pub(super) struct Diff<'a> {
    fix: &'a Fix,
-    source_code: SourceFile,
+    source_code: &'a SourceFile,
 }

 impl<'a> Diff<'a> {
--- a/crates/ruff_linter/src/message/json.rs
+++ b/crates/ruff_linter/src/message/json.rs
@@ -1,220 +0,0 @@
-use std::io::Write;
-
-use serde::ser::SerializeSeq;
-use serde::{Serialize, Serializer};
-use serde_json::{Value, json};
-
-use ruff_db::diagnostic::Diagnostic;
-use ruff_notebook::NotebookIndex;
-use ruff_source_file::{LineColumn, OneIndexed, SourceCode};
-use ruff_text_size::Ranged;
-
-use crate::Edit;
-use crate::message::{Emitter, EmitterContext};
-
-#[derive(Default)]
-pub struct JsonEmitter;
-
-impl Emitter for JsonEmitter {
-    fn emit(
-        &mut self,
-        writer: &mut dyn Write,
-        diagnostics: &[Diagnostic],
-        context: &EmitterContext,
-    ) -> anyhow::Result<()> {
-        serde_json::to_writer_pretty(
-            writer,
-            &ExpandedMessages {
-                diagnostics,
-                context,
-            },
-        )?;
-
-        Ok(())
-    }
-}
-
-struct ExpandedMessages<'a> {
-    diagnostics: &'a [Diagnostic],
-    context: &'a EmitterContext<'a>,
-}
-
-impl Serialize for ExpandedMessages<'_> {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        let mut s = serializer.serialize_seq(Some(self.diagnostics.len()))?;
-
-        for message in self.diagnostics {
-            let value = message_to_json_value(message, self.context);
-            s.serialize_element(&value)?;
-        }
-
-        s.end()
-    }
-}
-
-pub(crate) fn message_to_json_value(message: &Diagnostic, context: &EmitterContext) -> Value {
-    let source_file = message.expect_ruff_source_file();
-    let source_code = source_file.to_source_code();
-    let filename = message.expect_ruff_filename();
-    let notebook_index = context.notebook_index(&filename);
-
-    let fix = message.fix().map(|fix| {
-        json!({
-            "applicability": fix.applicability(),
-            "message": message.suggestion(),
-            "edits": &ExpandedEdits { edits: fix.edits(), source_code: &source_code, notebook_index },
-        })
-    });
-
-    let mut start_location = source_code.line_column(message.expect_range().start());
-    let mut end_location = source_code.line_column(message.expect_range().end());
-    let mut noqa_location = message
-        .noqa_offset()
-        .map(|offset| source_code.line_column(offset));
-    let mut notebook_cell_index = None;
-
-    if let Some(notebook_index) = notebook_index {
-        notebook_cell_index = Some(
-            notebook_index
-                .cell(start_location.line)
-                .unwrap_or(OneIndexed::MIN),
-        );
-        start_location = notebook_index.translate_line_column(&start_location);
-        end_location = notebook_index.translate_line_column(&end_location);
-        noqa_location =
-            noqa_location.map(|location| notebook_index.translate_line_column(&location));
-    }
-
-    json!({
-        "code": message.secondary_code(),
-        "url": message.to_url(),
-        "message": message.body(),
-        "fix": fix,
-        "cell": notebook_cell_index,
-        "location": location_to_json(start_location),
-        "end_location": location_to_json(end_location),
-        "filename": filename,
-        "noqa_row": noqa_location.map(|location| location.line)
-    })
-}
-
-fn location_to_json(location: LineColumn) -> serde_json::Value {
-    json!({
-        "row": location.line,
-        "column": location.column
-    })
-}
-
-struct ExpandedEdits<'a> {
-    edits: &'a [Edit],
-    source_code: &'a SourceCode<'a, 'a>,
-    notebook_index: Option<&'a NotebookIndex>,
-}
-
-impl Serialize for ExpandedEdits<'_> {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        let mut s = serializer.serialize_seq(Some(self.edits.len()))?;
-
-        for edit in self.edits {
-            let mut location = self.source_code.line_column(edit.start());
-            let mut end_location = self.source_code.line_column(edit.end());
-
-            if let Some(notebook_index) = self.notebook_index {
-                // There exists a newline between each cell's source code in the
-                // concatenated source code in Ruff. This newline doesn't actually
-                // exists in the JSON source field.
-                //
-                // Now, certain edits may try to remove this newline, which means
-                // the edit will spill over to the first character of the next cell.
-                // If it does, we need to translate the end location to the last
-                // character of the previous cell.
-                match (
-                    notebook_index.cell(location.line),
-                    notebook_index.cell(end_location.line),
-                ) {
-                    (Some(start_cell), Some(end_cell)) if start_cell != end_cell => {
-                        debug_assert_eq!(end_location.column.get(), 1);
-
-                        let prev_row = end_location.line.saturating_sub(1);
-                        end_location = LineColumn {
-                            line: notebook_index.cell_row(prev_row).unwrap_or(OneIndexed::MIN),
-                            column: self
-                                .source_code
-                                .line_column(self.source_code.line_end_exclusive(prev_row))
-                                .column,
-                        };
-                    }
-                    (Some(_), None) => {
-                        debug_assert_eq!(end_location.column.get(), 1);
-
-                        let prev_row = end_location.line.saturating_sub(1);
-                        end_location = LineColumn {
-                            line: notebook_index.cell_row(prev_row).unwrap_or(OneIndexed::MIN),
-                            column: self
-                                .source_code
-                                .line_column(self.source_code.line_end_exclusive(prev_row))
-                                .column,
-                        };
-                    }
-                    _ => {
-                        end_location = notebook_index.translate_line_column(&end_location);
-                    }
-                }
-                location = notebook_index.translate_line_column(&location);
-            }
-
-            let value = json!({
-                "content": edit.content().unwrap_or_default(),
-                "location": location_to_json(location),
-                "end_location": location_to_json(end_location)
-            });
-
-            s.serialize_element(&value)?;
-        }
-
-        s.end()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use insta::assert_snapshot;
-
-    use crate::message::JsonEmitter;
-    use crate::message::tests::{
-        capture_emitter_notebook_output, capture_emitter_output, create_diagnostics,
-        create_notebook_diagnostics, create_syntax_error_diagnostics,
-    };
-
-    #[test]
-    fn output() {
-        let mut emitter = JsonEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_diagnostics());
-
-        assert_snapshot!(content);
-    }
-
-    #[test]
-    fn syntax_errors() {
-        let mut emitter = JsonEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_syntax_error_diagnostics());
-
-        assert_snapshot!(content);
-    }
-
-    #[test]
-    fn notebook_output() {
-        let mut emitter = JsonEmitter;
-        let (diagnostics, notebook_indexes) = create_notebook_diagnostics();
-        let content =
-            capture_emitter_notebook_output(&mut emitter, &diagnostics, &notebook_indexes);
-
-        assert_snapshot!(content);
-    }
-}
--- a/crates/ruff_linter/src/message/json_lines.rs
+++ b/crates/ruff_linter/src/message/json_lines.rs
@@ -1,60 +0,0 @@
-use std::io::Write;
-
-use ruff_db::diagnostic::Diagnostic;
-
-use crate::message::json::message_to_json_value;
-use crate::message::{Emitter, EmitterContext};
-
-#[derive(Default)]
-pub struct JsonLinesEmitter;
-
-impl Emitter for JsonLinesEmitter {
-    fn emit(
-        &mut self,
-        writer: &mut dyn Write,
-        diagnostics: &[Diagnostic],
-        context: &EmitterContext,
-    ) -> anyhow::Result<()> {
-        for diagnostic in diagnostics {
-            serde_json::to_writer(&mut *writer, &message_to_json_value(diagnostic, context))?;
-            writer.write_all(b"\n")?;
-        }
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use insta::assert_snapshot;
-
-    use crate::message::json_lines::JsonLinesEmitter;
-    use crate::message::tests::{
-        capture_emitter_notebook_output, capture_emitter_output, create_diagnostics,
-        create_notebook_diagnostics, create_syntax_error_diagnostics,
-    };
-
-    #[test]
-    fn output() {
-        let mut emitter = JsonLinesEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_diagnostics());
-
-        assert_snapshot!(content);
-    }
-
-    #[test]
-    fn syntax_errors() {
-        let mut emitter = JsonLinesEmitter;
-        let content = capture_emitter_output(&mut emitter, &create_syntax_error_diagnostics());
-
-        assert_snapshot!(content);
-    }
-
-    #[test]
-    fn notebook_output() {
-        let mut emitter = JsonLinesEmitter;
-        let (messages, notebook_indexes) = create_notebook_diagnostics();
-        let content = capture_emitter_notebook_output(&mut emitter, &messages, &notebook_indexes);
-
-        assert_snapshot!(content);
-    }
-}
--- a/crates/ruff_linter/src/message/mod.rs
+++ b/crates/ruff_linter/src/message/mod.rs
@@ -3,17 +3,17 @@ use std::fmt::Display;
 use std::io::Write;
 use std::ops::Deref;

-use ruff_db::diagnostic::{
-    Annotation, Diagnostic, DiagnosticId, LintName, SecondaryCode, Severity, Span,
-};
 use rustc_hash::FxHashMap;

-pub use azure::AzureEmitter;
+use ruff_db::diagnostic::{
+    Annotation, Diagnostic, DiagnosticId, FileResolver, Input, LintName, SecondaryCode, Severity,
+    Span, UnifiedFile,
+};
+use ruff_db::files::File;
+
 pub use github::GithubEmitter;
 pub use gitlab::GitlabEmitter;
 pub use grouped::GroupedEmitter;
-pub use json::JsonEmitter;
-pub use json_lines::JsonLinesEmitter;
 pub use junit::JunitEmitter;
 pub use pylint::PylintEmitter;
 pub use rdjson::RdjsonEmitter;
@@ -26,13 +26,10 @@ pub use text::TextEmitter;
 use crate::Fix;
 use crate::registry::Rule;

-mod azure;
 mod diff;
 mod github;
 mod gitlab;
 mod grouped;
-mod json;
-mod json_lines;
 mod junit;
 mod pylint;
 mod rdjson;
@@ -107,6 +104,34 @@ where
    diagnostic
 }

+impl FileResolver for EmitterContext<'_> {
+    fn path(&self, _file: File) -> &str {
+        unimplemented!("Expected a Ruff file for rendering a Ruff diagnostic");
+    }
+
+    fn input(&self, _file: File) -> Input {
+        unimplemented!("Expected a Ruff file for rendering a Ruff diagnostic");
+    }
+
+    fn notebook_index(&self, file: &UnifiedFile) -> Option<NotebookIndex> {
+        match file {
+            UnifiedFile::Ty(_) => {
+                unimplemented!("Expected a Ruff file for rendering a Ruff diagnostic")
+            }
+            UnifiedFile::Ruff(file) => self.notebook_indexes.get(file.name()).cloned(),
+        }
+    }
+
+    fn is_notebook(&self, file: &UnifiedFile) -> bool {
+        match file {
+            UnifiedFile::Ty(_) => {
+                unimplemented!("Expected a Ruff file for rendering a Ruff diagnostic")
+            }
+            UnifiedFile::Ruff(file) => self.notebook_indexes.get(file.name()).is_some(),
+        }
+    }
+}
+
 struct MessageWithLocation<'a> {
    message: &'a Diagnostic,
    start_location: LineColumn,
--- a/crates/ruff_linter/src/message/rdjson.rs
+++ b/crates/ruff_linter/src/message/rdjson.rs
@@ -73,7 +73,7 @@ fn message_to_rdjson_value(message: &Diagnostic) -> Value {
            },
            "code": {
                "value": message.secondary_code(),
-                "url": message.to_url(),
+                "url": message.to_ruff_url(),
            },
            "suggestions": rdjson_suggestions(fix.edits(), &source_code),
        })
@@ -86,7 +86,7 @@ fn message_to_rdjson_value(message: &Diagnostic) -> Value {
            },
            "code": {
                "value": message.secondary_code(),
-                "url": message.to_url(),
+                "url": message.to_ruff_url(),
            },
        })
    }
--- a/crates/ruff_linter/src/rules/flake8_bugbear/rules/assert_raises_exception.rs
+++ b/crates/ruff_linter/src/rules/flake8_bugbear/rules/assert_raises_exception.rs
@@ -87,9 +87,14 @@ fn detect_blind_exception(
        }
    }

-    let first_arg = arguments.args.first()?;
+    let exception_argument_name = if is_pytest_raises {
+        "expected_exception"
+    } else {
+        "exception"
+    };

-    let builtin_symbol = semantic.resolve_builtin_symbol(first_arg)?;
+    let exception_expr = arguments.find_argument_value(exception_argument_name, 0)?;
+    let builtin_symbol = semantic.resolve_builtin_symbol(exception_expr)?;

    match builtin_symbol {
        "Exception" => Some(ExceptionKind::Exception),
--- a/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestsB017_B017_0.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestsB017_B017_0.py.snap
@@ -43,3 +43,29 @@ B017_0.py:57:36: B017 Do not assert blind exception: `Exception`
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^ B017
 58 |         raise ValueError("Multiple context managers")
   |
+
+B017_0.py:62:10: B017 Do not assert blind exception: `Exception`
+   |
+61 | def test_pytest_raises_keyword():
+62 |     with pytest.raises(expected_exception=Exception):
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+63 |         raise ValueError("Should be flagged")
+   |
+
+B017_0.py:68:18: B017 Do not assert blind exception: `Exception`
+   |
+66 |     class TestKwargs(unittest.TestCase):
+67 |         def test_method(self):
+68 |             with self.assertRaises(exception=Exception):
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+69 |                 raise ValueError("Should be flagged")
+   |
+
+B017_0.py:71:18: B017 Do not assert blind exception: `BaseException`
+   |
+69 |                 raise ValueError("Should be flagged")
+70 |
+71 |             with self.assertRaises(exception=BaseException):
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+72 |                 raise ValueError("Should be flagged")
+   |
--- a/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestsB018_B018.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestsB018_B018.py.snap
@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_bugbear/mod.rs
-snapshot_kind: text
 ---
 B018.py:11:5: B018 Found useless expression. Either assign it to a variable or remove it.
   |
--- a/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestspreview__B017_B017_0.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_bugbear/snapshots/ruff_linterrulesflake8_bugbeartestspreview__B017_B017_0.py.snap
@@ -43,3 +43,29 @@ B017_0.py:57:36: B017 Do not assert blind exception: `Exception`
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^ B017
 58 |         raise ValueError("Multiple context managers")
   |
+
+B017_0.py:62:10: B017 Do not assert blind exception: `Exception`
+   |
+61 | def test_pytest_raises_keyword():
+62 |     with pytest.raises(expected_exception=Exception):
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+63 |         raise ValueError("Should be flagged")
+   |
+
+B017_0.py:68:18: B017 Do not assert blind exception: `Exception`
+   |
+66 |     class TestKwargs(unittest.TestCase):
+67 |         def test_method(self):
+68 |             with self.assertRaises(exception=Exception):
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+69 |                 raise ValueError("Should be flagged")
+   |
+
+B017_0.py:71:18: B017 Do not assert blind exception: `BaseException`
+   |
+69 |                 raise ValueError("Should be flagged")
+70 |
+71 |             with self.assertRaises(exception=BaseException):
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ B017
+72 |                 raise ValueError("Should be flagged")
+   |
--- a/crates/ruff_linter/src/rules/flake8_django/rules/model_without_dunder_str.rs
+++ b/crates/ruff_linter/src/rules/flake8_django/rules/model_without_dunder_str.rs
@@ -96,22 +96,43 @@ fn is_model_abstract(class_def: &ast::StmtClassDef) -> bool {
            continue;
        }
        for element in body {
-            let Stmt::Assign(ast::StmtAssign { targets, value, .. }) = element else {
-                continue;
-            };
-            for target in targets {
-                let Expr::Name(ast::ExprName { id, .. }) = target else {
-                    continue;
-                };
-                if id != "abstract" {
-                    continue;
+            match element {
+                Stmt::Assign(ast::StmtAssign { targets, value, .. }) => {
+                    if targets
+                        .iter()
+                        .any(|target| is_abstract_true_assignment(target, Some(value)))
+                    {
+                        return true;
+                    }
                }
-                if !is_const_true(value) {
-                    continue;
+                Stmt::AnnAssign(ast::StmtAnnAssign { target, value, .. }) => {
+                    if is_abstract_true_assignment(target, value.as_deref()) {
+                        return true;
+                    }
                }
-                return true;
+                _ => {}
            }
        }
    }
    false
 }
+
+fn is_abstract_true_assignment(target: &Expr, value: Option<&Expr>) -> bool {
+    let Expr::Name(ast::ExprName { id, .. }) = target else {
+        return false;
+    };
+
+    if id != "abstract" {
+        return false;
+    }
+
+    let Some(value) = value else {
+        return false;
+    };
+
+    if !is_const_true(value) {
+        return false;
+    }
+
+    true
+}
--- a/crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linterrulesflake8_djangotestsDJ008_DJ008.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linterrulesflake8_djangotestsDJ008_DJ008.py.snap
@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_django/mod.rs
-snapshot_kind: text
 ---
 DJ008.py:6:7: DJ008 Model does not define `__str__` method
  |
@@ -31,3 +30,11 @@ DJ008.py:182:7: DJ008 Model does not define `__str__` method
    |       ^^^^^^^^^^^^^^^^^^ DJ008
 183 |     pass
    |
+
+DJ008.py:215:7: DJ008 Model does not define `__str__` method
+    |
+215 | class TypeAnnotatedNonAbstractModel(models.Model):
+    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ DJ008
+216 |     """Model with type-annotated abstract = False - should trigger DJ008"""
+217 |     new_field = models.CharField(max_length=10)
+    |
--- a/crates/ruff_linter/src/rules/flake8_gettext/snapshots/ruff_linterrulesflake8_gettexttestsf-string-in-get-text-func-call_INT001.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_gettext/snapshots/ruff_linterrulesflake8_gettexttestsf-string-in-get-text-func-call_INT001.py.snap
@@ -1,9 +1,10 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_gettext/mod.rs
-snapshot_kind: text
 ---
 INT001.py:1:3: INT001 f-string is resolved before function call; consider `_("string %s") % arg`
  |
 1 | _(f"{'value'}")
  |   ^^^^^^^^^^^^ INT001
+2 |
+3 | # Don't trigger for t-strings
  |
--- a/crates/ruff_linter/src/rules/flake8_logging_format/snapshots/ruff_linterrulesflake8_logging_formattestsG004.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_logging_format/snapshots/ruff_linterrulesflake8_logging_formattestsG004.py.snap
@@ -52,4 +52,6 @@ G004.py:15:6: G004 Logging statement uses f-string
 14 | info(f"{name}")
 15 | info(f"{__name__}")
   |      ^^^^^^^^^^^^^ G004
+16 |
+17 | # Don't trigger for t-strings
   |
--- a/crates/ruff_linter/src/rules/flake8_pytest_style/snapshots/ruff_linterrulesflake8_pytest_styletestsPT016.snap
+++ b/crates/ruff_linter/src/rules/flake8_pytest_style/snapshots/ruff_linterrulesflake8_pytest_styletestsPT016.snap
@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_pytest_style/mod.rs
-snapshot_kind: text
 ---
 PT016.py:19:5: PT016 No message passed to `pytest.fail()`
   |
@@ -67,4 +66,6 @@ PT016.py:25:5: PT016 No message passed to `pytest.fail()`
 24 |     pytest.fail(reason="")
 25 |     pytest.fail(reason=f"")
   |     ^^^^^^^^^^^ PT016
+26 |
+27 | # Skip for t-strings
   |
--- a/crates/ruff_linter/src/rules/flake8_return/rules/function.rs
+++ b/crates/ruff_linter/src/rules/flake8_return/rules/function.rs
@@ -539,7 +539,21 @@ fn implicit_return(checker: &Checker, function_def: &ast::StmtFunctionDef, stmt:
 }

 /// RET504
-fn unnecessary_assign(checker: &Checker, stack: &Stack) {
+pub(crate) fn unnecessary_assign(checker: &Checker, function_stmt: &Stmt) {
+    let Stmt::FunctionDef(function_def) = function_stmt else {
+        return;
+    };
+    let Some(stack) = create_stack(checker, function_def) else {
+        return;
+    };
+
+    if !result_exists(&stack.returns) {
+        return;
+    }
+
+    let Some(function_scope) = checker.semantic().function_scope(function_def) else {
+        return;
+    };
    for (assign, return_, stmt) in &stack.assignment_return {
        // Identify, e.g., `return x`.
        let Some(value) = return_.value.as_ref() else {
@@ -583,6 +597,22 @@ fn unnecessary_assign(checker: &Checker, stack: &Stack) {
            continue;
        }

+        let Some(assigned_binding) = function_scope
+            .get(assigned_id)
+            .map(|binding_id| checker.semantic().binding(binding_id))
+        else {
+            continue;
+        };
+        // Check if there's any reference made to `assigned_binding` in another scope, e.g, nested
+        // functions. If there is, ignore them.
+        if assigned_binding
+            .references()
+            .map(|reference_id| checker.semantic().reference(reference_id))
+            .any(|reference| reference.scope_id() != assigned_binding.scope)
+        {
+            continue;
+        }
+
        let mut diagnostic = checker.report_diagnostic(
            UnnecessaryAssign {
                name: assigned_id.to_string(),
@@ -665,24 +695,21 @@ fn superfluous_elif_else(checker: &Checker, stack: &Stack) {
    }
 }

-/// Run all checks from the `flake8-return` plugin.
-pub(crate) fn function(checker: &Checker, function_def: &ast::StmtFunctionDef) {
-    let ast::StmtFunctionDef {
-        decorator_list,
-        returns,
-        body,
-        ..
-    } = function_def;
+fn create_stack<'a>(
+    checker: &'a Checker,
+    function_def: &'a ast::StmtFunctionDef,
+) -> Option<Stack<'a>> {
+    let ast::StmtFunctionDef { body, .. } = function_def;

    // Find the last statement in the function.
    let Some(last_stmt) = body.last() else {
        // Skip empty functions.
-        return;
+        return None;
    };

    // Skip functions that consist of a single return statement.
    if body.len() == 1 && matches!(last_stmt, Stmt::Return(_)) {
-        return;
+        return None;
    }

    // Traverse the function body, to collect the stack.
@@ -696,9 +723,29 @@ pub(crate) fn function(checker: &Checker, function_def: &ast::StmtFunctionDef) {

    // Avoid false positives for generators.
    if stack.is_generator {
-        return;
+        return None;
    }

+    Some(stack)
+}
+
+/// Run all checks from the `flake8-return` plugin, but `RET504` which is ran
+/// after the semantic model is fully built.
+pub(crate) fn function(checker: &Checker, function_def: &ast::StmtFunctionDef) {
+    let ast::StmtFunctionDef {
+        decorator_list,
+        returns,
+        body,
+        ..
+    } = function_def;
+
+    let Some(stack) = create_stack(checker, function_def) else {
+        return;
+    };
+    let Some(last_stmt) = body.last() else {
+        return;
+    };
+
    if checker.any_rule_enabled(&[
        Rule::SuperfluousElseReturn,
        Rule::SuperfluousElseRaise,
@@ -721,10 +768,6 @@ pub(crate) fn function(checker: &Checker, function_def: &ast::StmtFunctionDef) {
        if checker.is_rule_enabled(Rule::ImplicitReturn) {
            implicit_return(checker, function_def, last_stmt);
        }
-
-        if checker.is_rule_enabled(Rule::UnnecessaryAssign) {
-            unnecessary_assign(checker, &stack);
-        }
    } else {
        if checker.is_rule_enabled(Rule::UnnecessaryReturnNone) {
            // Skip functions that have a return annotation that is not `None`.
--- a/crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linterrulesflake8_returntestsRET504_RET504.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linterrulesflake8_returntestsRET504_RET504.py.snap
@@ -247,8 +247,6 @@ RET504.py:423:16: RET504 [*] Unnecessary assignment to `services` before `return
 422 |         services = a["services"]
 423 |         return services
    |                ^^^^^^^^ RET504
-424 |
-425 | # See: https://github.com/astral-sh/ruff/issues/18411
    |
    = help: Remove unnecessary assignment

@@ -260,46 +258,46 @@ RET504.py:423:16: RET504 [*] Unnecessary assignment to `services` before `return
 423     |-        return services
    422 |+        return a["services"]
 424 423 | 
-425 424 | # See: https://github.com/astral-sh/ruff/issues/18411
-426 425 | def f():
+425 424 | 
+426 425 | # See: https://github.com/astral-sh/ruff/issues/14052

-RET504.py:429:12: RET504 [*] Unnecessary assignment to `x` before `return` statement
+RET504.py:458:12: RET504 [*] Unnecessary assignment to `x` before `return` statement
    |
-427 |     (#=
-428 |     x) = 1
-429 |     return x
+456 |     (#=
+457 |     x) = 1
+458 |     return x
    |            ^ RET504
-430 |
-431 | def f():
+459 |
+460 | def f():
    |
    = help: Remove unnecessary assignment

 ℹ Unsafe fix
-424 424 | 
-425 425 | # See: https://github.com/astral-sh/ruff/issues/18411
-426 426 | def f():
-427     |-    (#=
-428     |-    x) = 1
-429     |-    return x
-    427 |+    return 1
-430 428 | 
-431 429 | def f():
-432 430 |     x = (1
+453 453 | 
+454 454 | # See: https://github.com/astral-sh/ruff/issues/18411
+455 455 | def f():
+456     |-    (#=
+457     |-    x) = 1
+458     |-    return x
+    456 |+    return 1
+459 457 | 
+460 458 | def f():
+461 459 |     x = (1

-RET504.py:434:12: RET504 [*] Unnecessary assignment to `x` before `return` statement
+RET504.py:463:12: RET504 [*] Unnecessary assignment to `x` before `return` statement
    |
-432 |     x = (1
-433 |               )
-434 |     return x
+461 |     x = (1
+462 |               )
+463 |     return x
    |            ^ RET504
    |
    = help: Remove unnecessary assignment

 ℹ Unsafe fix
-429 429 |     return x
-430 430 | 
-431 431 | def f():
-432     |-    x = (1
-    432 |+    return (1
-433 433 |               )
-434     |-    return x
+458 458 |     return x
+459 459 | 
+460 460 | def f():
+461     |-    x = (1
+    461 |+    return (1
+462 462 |               )
+463     |-    return x
--- a/crates/ruff_linter/src/rules/flake8_type_checking/mod.rs
+++ b/crates/ruff_linter/src/rules/flake8_type_checking/mod.rs
@@ -36,6 +36,7 @@ mod tests {
    #[test_case(Rule::RuntimeImportInTypeCheckingBlock, Path::new("TC004_8.py"))]
    #[test_case(Rule::RuntimeImportInTypeCheckingBlock, Path::new("TC004_9.py"))]
    #[test_case(Rule::RuntimeImportInTypeCheckingBlock, Path::new("quote.py"))]
+    #[test_case(Rule::RuntimeImportInTypeCheckingBlock, Path::new("whitespace.py"))]
    #[test_case(Rule::RuntimeStringUnion, Path::new("TC010_1.py"))]
    #[test_case(Rule::RuntimeStringUnion, Path::new("TC010_2.py"))]
    #[test_case(Rule::TypingOnlyFirstPartyImport, Path::new("TC001.py"))]
--- a/crates/ruff_linter/src/rules/flake8_type_checking/snapshots/ruff_linterrulesflake8_type_checkingtestsruntime-import-in-type-checking-block_whitespace.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_type_checking/snapshots/ruff_linterrulesflake8_type_checkingtestsruntime-import-in-type-checking-block_whitespace.py.snap
@@ -0,0 +1,22 @@
+---
+source: crates/ruff_linter/src/rules/flake8_type_checking/mod.rs
+---
+whitespace.py:5:26: TC004 [*] Move import `builtins` out of type-checking block. Import is used for more than type hinting.
+  |
+3 | from typing import TYPE_CHECKING\
+4 |
+5 | if TYPE_CHECKING: import builtins
+  |                          ^^^^^^^^ TC004
+6 | builtins.print("!")
+  |
+  = help: Move out of type-checking block
+
+ℹ Unsafe fix
+1 1 | # Regression test for: https://github.com/astral-sh/ruff/issues/19175
+2 2 | # there is a (potentially invisible) unicode formfeed character (000C) between `TYPE_CHECKING` and the backslash
+3   |-from typing import TYPE_CHECKING\
+  3 |+from typing import TYPE_CHECKING; import builtins\
+4 4 | 
+5   |-if TYPE_CHECKING: import builtins
+  5 |+if TYPE_CHECKING: pass
+6 6 | builtins.print("!")
--- a/crates/ruff_linter/src/rules/flake8_unused_arguments/snapshots/ruff_linterrulesflake8_unused_argumentstestsARG002_ARG.py.snap
+++ b/crates/ruff_linter/src/rules/flake8_unused_arguments/snapshots/ruff_linterrulesflake8_unused_argumentstestsARG002_ARG.py.snap
@@ -66,3 +66,13 @@ ARG.py:216:24: ARG002 Unused method argument: `x`
    |                        ^ ARG002
 217 |         print("Hello, world!")
    |
+
+ARG.py:255:20: ARG002 Unused method argument: `y`
+    |
+253 | ###
+254 | class C:
+255 |     def f(self, x, y):
+    |                    ^ ARG002
+256 |         """Docstring."""
+257 |         msg = t"{x}..."
+    |
--- a/crates/ruff_linter/src/rules/isort/mod.rs
+++ b/crates/ruff_linter/src/rules/isort/mod.rs
@@ -912,6 +912,7 @@ mod tests {
    #[test_case(Path::new("docstring.pyi"))]
    #[test_case(Path::new("docstring_only.py"))]
    #[test_case(Path::new("empty.py"))]
+    #[test_case(Path::new("multiple_strings.py"))]
    fn required_imports(path: &Path) -> Result<()> {
        let snapshot = format!("required_imports_{}", path.to_string_lossy());
        let diagnostics = test_path(
--- a/crates/ruff_linter/src/rules/isort/snapshots/ruff_linterrulesisorttestsrequired_imports_multiple_strings.py.snap
+++ b/crates/ruff_linter/src/rules/isort/snapshots/ruff_linterrulesisorttestsrequired_imports_multiple_strings.py.snap
@@ -0,0 +1,18 @@
+---
+source: crates/ruff_linter/src/rules/isort/mod.rs
+---
+multiple_strings.py:1:1: I002 [*] Missing required import: `from __future__ import annotations`
+ℹ Safe fix
+1 1 | """This is a docstring."""
+  2 |+from __future__ import annotations
+2 3 | "This is not a docstring."
+3 4 | "This is also not a docstring."
+4 5 | 
+
+multiple_strings.py:1:1: I002 [*] Missing required import: `from __future__ import generator_stop`
+ℹ Safe fix
+1 1 | """This is a docstring."""
+  2 |+from __future__ import generator_stop
+2 3 | "This is not a docstring."
+3 4 | "This is also not a docstring."
+4 5 |
--- a/crates/ruff_linter/src/rules/pep8_naming/rules/invalid_function_name.rs
+++ b/crates/ruff_linter/src/rules/pep8_naming/rules/invalid_function_name.rs
@@ -1,9 +1,7 @@
-use ruff_python_ast::{Decorator, Stmt};
-
 use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::identifier::Identifier;
+use ruff_python_ast::{Decorator, Stmt, identifier::Identifier};
 use ruff_python_semantic::SemanticModel;
-use ruff_python_semantic::analyze::visibility;
+use ruff_python_semantic::analyze::{class::any_base_class, visibility};
 use ruff_python_stdlib::str;

 use crate::Violation;
@@ -84,6 +82,41 @@ pub(crate) fn invalid_function_name(
        return;
    }

+    let parent_class = semantic
+        .current_statement_parent()
+        .and_then(|parent| parent.as_class_def_stmt());
+
+    // Ignore the visit_* methods of the ast.NodeVisitor and ast.NodeTransformer classes.
+    if name.starts_with("visit_")
+        && parent_class.is_some_and(|class| {
+            any_base_class(class, semantic, &mut |superclass| {
+                let qualified = semantic.resolve_qualified_name(superclass);
+                qualified.is_some_and(|name| {
+                    matches!(name.segments(), ["ast", "NodeVisitor" | "NodeTransformer"])
+                })
+            })
+        })
+    {
+        return;
+    }
+
+    // Ignore the do_* methods of the http.server.BaseHTTPRequestHandler class
+    if name.starts_with("do_")
+        && parent_class.is_some_and(|class| {
+            any_base_class(class, semantic, &mut |superclass| {
+                let qualified = semantic.resolve_qualified_name(superclass);
+                qualified.is_some_and(|name| {
+                    matches!(
+                        name.segments(),
+                        ["http", "server", "BaseHTTPRequestHandler"]
+                    )
+                })
+            })
+        })
+    {
+        return;
+    }
+
    checker.report_diagnostic(
        InvalidFunctionName {
            name: name.to_string(),
--- a/crates/ruff_linter/src/rules/pep8_naming/snapshots/ruff_linterrulespep8_namingtestsN802_N802.py.snap
+++ b/crates/ruff_linter/src/rules/pep8_naming/snapshots/ruff_linterrulespep8_namingtestsN802_N802.py.snap
@@ -37,3 +37,21 @@ N802.py:40:9: N802 Function name `testTest` should be lowercase
   |         ^^^^^^^^ N802
 41 |         assert True
   |
+
+N802.py:65:9: N802 Function name `bad_Name` should be lowercase
+   |
+63 |         pass
+64 |
+65 |     def bad_Name(self):
+   |         ^^^^^^^^ N802
+66 |         pass
+   |
+
+N802.py:84:9: N802 Function name `dont_GET` should be lowercase
+   |
+82 |         pass
+83 |
+84 |     def dont_GET(self):
+   |         ^^^^^^^^ N802
+85 |         pass
+   |
--- a/crates/ruff_linter/src/rules/pylint/rules/invalid_envvar_value.rs
+++ b/crates/ruff_linter/src/rules/pylint/rules/invalid_envvar_value.rs
@@ -18,11 +18,15 @@ use crate::checkers::ast::Checker;
 ///
 /// ## Example
 /// ```python
+/// import os
+///
 /// os.getenv(1)
 /// ```
 ///
 /// Use instead:
 /// ```python
+/// import os
+///
 /// os.getenv("1")
 /// ```
 #[derive(ViolationMetadata)]
--- a/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linterrulespylinttestsPLR6301_no_self_use.py.snap
+++ b/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linterrulespylinttestsPLR6301_no_self_use.py.snap
@@ -75,3 +75,21 @@ no_self_use.py:140:9: PLR6301 Method `unused_message_2` could be a function, cla
 141 |         msg = ""
 142 |         raise NotImplementedError(x)
    |
+
+no_self_use.py:145:9: PLR6301 Method `developer_greeting` could be a function, class method, or static method
+    |
+144 | class TPerson:
+145 |     def developer_greeting(self, name):  # [no-self-use]
+    |         ^^^^^^^^^^^^^^^^^^ PLR6301
+146 |         print(t"Greetings {name}!")
+    |
+
+no_self_use.py:151:9: PLR6301 Method `tstring` could be a function, class method, or static method
+    |
+149 |         print(t"Hello from {self.name} !")
+150 |
+151 |     def tstring(self, x):
+    |         ^^^^^^^ PLR6301
+152 |         msg = t"{x}"
+153 |         raise NotImplementedError(msg)
+    |
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/deprecated_c_element_tree.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/deprecated_c_element_tree.rs
@@ -14,12 +14,12 @@ use crate::{AlwaysFixableViolation, Edit, Fix};
 ///
 /// ## Example
 /// ```python
-/// from xml.etree import cElementTree
+/// from xml.etree import cElementTree as ET
 /// ```
 ///
 /// Use instead:
 /// ```python
-/// from xml.etree import ElementTree
+/// from xml.etree import ElementTree as ET
 /// ```
 ///
 /// ## References
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/pep695/non_pep695_generic_class.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/pep695/non_pep695_generic_class.rs
@@ -43,7 +43,7 @@ use super::{
 /// ## Example
 ///
 /// ```python
-/// from typing import TypeVar
+/// from typing import Generic, TypeVar
 ///
 /// T = TypeVar("T")
 ///
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/pep695/non_pep695_type_alias.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/pep695/non_pep695_type_alias.rs
@@ -40,12 +40,18 @@ use super::{
 ///
 /// ## Example
 /// ```python
+/// from typing import Annotated, TypeAlias, TypeAliasType
+/// from annotated_types import Gt
+///
 /// ListOfInt: TypeAlias = list[int]
 /// PositiveInt = TypeAliasType("PositiveInt", Annotated[int, Gt(0)])
 /// ```
 ///
 /// Use instead:
 /// ```python
+/// from typing import Annotated
+/// from annotated_types import Gt
+///
 /// type ListOfInt = list[int]
 /// type PositiveInt = Annotated[int, Gt(0)]
 /// ```
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/timeout_error_alias.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/timeout_error_alias.rs
@@ -27,6 +27,8 @@ use crate::{AlwaysFixableViolation, Edit, Fix};
 ///
 /// ## Example
 /// ```python
+/// import asyncio
+///
 /// raise asyncio.TimeoutError
 /// ```
 ///
--- a/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linterrulespyupgradetestsUP012.py.snap
+++ b/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linterrulespyupgradetestsUP012.py.snap
@@ -576,6 +576,8 @@ UP012.py:86:5: UP012 [*] Unnecessary call to `encode` as UTF-8
 85 | # Refer: https://github.com/astral-sh/ruff/issues/11736
 86 | x: '"foo".encode("utf-8")'
   |     ^^^^^^^^^^^^^^^^^^^^^ UP012
+87 |
+88 | # AttributeError for t-strings so skip lint
   |
   = help: Rewrite as bytes literal

@@ -585,3 +587,6 @@ UP012.py:86:5: UP012 [*] Unnecessary call to `encode` as UTF-8
 85 85 | # Refer: https://github.com/astral-sh/ruff/issues/11736
 86    |-x: '"foo".encode("utf-8")'
   86 |+x: 'b"foo"'
+87 87 | 
+88 88 | # AttributeError for t-strings so skip lint
+89 89 | (t"foo{bar}").encode("utf-8")
--- a/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linterrulespyupgradetestsUP018.py.snap
+++ b/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linterrulespyupgradetestsUP018.py.snap
@@ -660,6 +660,7 @@ UP018.py:90:1: UP018 [*] Unnecessary `int` call (rewrite as a literal)
   90 |+1 and None
 91 91 | float(1.)and None
 92 92 | bool(True)and()
+93 93 | 

 UP018.py:91:1: UP018 [*] Unnecessary `float` call (rewrite as a literal)
   |
@@ -678,6 +679,8 @@ UP018.py:91:1: UP018 [*] Unnecessary `float` call (rewrite as a literal)
 91    |-float(1.)and None
   91 |+1. and None
 92 92 | bool(True)and()
+93 93 | 
+94 94 | 

 UP018.py:92:1: UP018 [*] Unnecessary `bool` call (rewrite as a literal)
   |
@@ -694,3 +697,6 @@ UP018.py:92:1: UP018 [*] Unnecessary `bool` call (rewrite as a literal)
 91 91 | float(1.)and None
 92    |-bool(True)and()
   92 |+True and()
+93 93 | 
+94 94 | 
+95 95 | # t-strings are not native literals
--- a/crates/ruff_linter/src/rules/refurb/rules/for_loop_writes.rs
+++ b/crates/ruff_linter/src/rules/refurb/rules/for_loop_writes.rs
@@ -19,22 +19,26 @@ use crate::rules::refurb::helpers::parenthesize_loop_iter_if_necessary;
 ///
 /// ## Example
 /// ```python
+/// from pathlib import Path
+///
 /// with Path("file").open("w") as f:
 ///     for line in lines:
 ///         f.write(line)
 ///
-/// with Path("file").open("wb") as f:
-///     for line in lines:
-///         f.write(line.encode())
+/// with Path("file").open("wb") as f_b:
+///     for line_b in lines_b:
+///         f_b.write(line_b.encode())
 /// ```
 ///
 /// Use instead:
 /// ```python
+/// from pathlib import Path
+///
 /// with Path("file").open("w") as f:
 ///     f.writelines(lines)
 ///
-/// with Path("file").open("wb") as f:
-///     f.writelines(line.encode() for line in lines)
+/// with Path("file").open("wb") as f_b:
+///     f_b.writelines(line_b.encode() for line_b in lines_b)
 /// ```
 ///
 /// ## Fix safety
--- a/crates/ruff_linter/src/rules/refurb/rules/implicit_cwd.rs
+++ b/crates/ruff_linter/src/rules/refurb/rules/implicit_cwd.rs
@@ -14,11 +14,15 @@ use crate::{checkers::ast::Checker, importer::ImportRequest};
 ///
 /// ## Example
 /// ```python
+/// from pathlib import Path
+///
 /// cwd = Path().resolve()
 /// ```
 ///
 /// Use instead:
 /// ```python
+/// from pathlib import Path
+///
 /// cwd = Path.cwd()
 /// ```
 ///
--- a/Show More
+++ b/Show More