Bump version to 0.0.26

Implement R002 (NoAssertEquals) (#98 )
Add a note RE Black compat
2022-09-05 12:28:27 -04:00 · 2022-09-05 12:27:47 -04:00 · 2022-09-05 12:27:39 -04:00 · 2022-09-05 12:16:06 -04:00 · 2022-09-05 09:31:55 -04:00 · 2022-09-04 17:54:45 -04:00
52 changed files with 2421 additions and 556 deletions
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,16 +2,16 @@ name: CI

 on:
  push:
-    branches: [ main ]
+    branches: [main]
  pull_request:
-    branches: [ main ]
+    branches: [main]

 jobs:
  cargo_build:
    name: "cargo build"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -33,7 +33,7 @@ jobs:
    name: "cargo fmt"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -55,7 +55,7 @@ jobs:
    name: "cargo clippy"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -77,7 +77,7 @@ jobs:
    name: "cargo test"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -99,13 +99,13 @@ jobs:
    name: "maturin build"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
      - uses: actions/setup-python@v4
        with:
-          python-version: '3.10'
+          python-version: "3.10"
      - run: pip install maturin
      - uses: actions/cache@v3
        env:
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -227,9 +227,9 @@ jobs:
        os: [ubuntu-latest, macos-latest]
        target: [x86_64, aarch64]
        python-version:
-          - '3.7'
-          - '3.8'
-          - '3.9'
+          - "3.7"
+          - "3.8"
+          - "3.9"
        exclude:
          - os: macos-latest
            target: aarch64
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 # Local cache
-.cache
+.ruff_cache
 resources/test/cpython

 ###
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,5 @@
+repos:
+  - repo: https://github.com/charliermarsh/ruff
+    rev: v0.0.26
+    hooks:
+      - id: lint
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -0,0 +1,7 @@
+- id: lint
+  name: ruff lint
+  description: Run ruff to lint Python files.
+  entry: ruff
+  language: python
+  types_or: [python]
+  pass_filenames: true
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3

+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "ahash"
 version = "0.7.6"
@@ -197,6 +203,12 @@ dependencies = [
 "byteorder",
 ]

+[[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -362,6 +374,12 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "chunked_transfer"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"
+
 [[package]]
 name = "clap"
 version = "3.2.16"
@@ -465,6 +483,15 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "crc32fast"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+dependencies = [
+ "cfg-if 1.0.0",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.6"
@@ -550,6 +577,15 @@ dependencies = [
 "generic-array 0.14.6",
 ]

+[[package]]
+name = "directories"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f51c5d4ddabd36886dd3e1438cb358cdcb0d7c499cb99cb4ac2e38e18b5cb210"
+dependencies = [
+ "dirs-sys",
+]
+
 [[package]]
 name = "dirs"
 version = "2.0.2"
@@ -664,12 +700,32 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"

+[[package]]
+name = "flate2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f82b0f4c27ad9f8bfd1f3208d882da2b09c301bc1c828fd3a00d0216d2fbbff6"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"

+[[package]]
+name = "form_urlencoded"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
+dependencies = [
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "fsevent"
 version = "0.4.0"
@@ -914,6 +970,17 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "idna"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.1"
@@ -1084,6 +1151,12 @@ dependencies = [
 "twox-hash",
 ]

+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -1108,6 +1181,15 @@ dependencies = [
 "autocfg",
 ]

+[[package]]
+name = "miniz_oxide"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f5c75688da582b8ffc1f1799e9db273f32133c49e048f614d22ec3256773ccc"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "mio"
 version = "0.6.23"
@@ -1260,9 +1342,9 @@ dependencies = [

 [[package]]
 name = "once_cell"
-version = "1.13.0"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18a6dbe30758c9f83eb00cbea4ac95966305f5a7772f3f42ebfc7fc7eddbd8e1"
+checksum = "074864da206b4973b84eb91683020dbefd6a8c3f0f38e054d93954e891935e4e"

 [[package]]
 name = "opaque-debug"
@@ -1311,6 +1393,12 @@ dependencies = [
 "windows-sys",
 ]

+[[package]]
+name = "percent-encoding"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
+
 [[package]]
 name = "petgraph"
 version = "0.6.2"
@@ -1639,9 +1727,24 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "ring"
+version = "0.16.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3053cf52e236a3ed746dfc745aa9cacf1b791d846bdaf412f60a8d7d6e17c8fc"
+dependencies = [
+ "cc",
+ "libc",
+ "once_cell",
+ "spin",
+ "untrusted",
+ "web-sys",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "ruff"
-version = "0.0.23"
+version = "0.0.26"
 dependencies = [
 "anyhow",
 "bincode",
@@ -1657,19 +1760,33 @@ dependencies = [
 "glob",
 "log",
 "notify",
+ "once_cell",
 "rayon",
 "regex",
 "rustpython-parser",
 "serde",
 "serde_json",
 "toml",
+ "update-informer",
 "walkdir",
 ]

+[[package]]
+name = "rustls"
+version = "0.20.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aab8ee6c7097ed6057f43c187a62418d0c05a4bd5f18b3571db50ee0f9ce033"
+dependencies = [
+ "log",
+ "ring",
+ "sct",
+ "webpki",
+]
+
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1613f6c6990011a4bc559e79aaf28d715f9f729b#1613f6c6990011a4bc559e79aaf28d715f9f729b"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=ff6112d7c70729be76eaad8c9e5b8ef24d13de99#ff6112d7c70729be76eaad8c9e5b8ef24d13de99"
 dependencies = [
 "num-bigint",
 "rustpython-compiler-core",
@@ -1678,7 +1795,7 @@ dependencies = [
 [[package]]
 name = "rustpython-compiler-core"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1613f6c6990011a4bc559e79aaf28d715f9f729b#1613f6c6990011a4bc559e79aaf28d715f9f729b"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=ff6112d7c70729be76eaad8c9e5b8ef24d13de99#ff6112d7c70729be76eaad8c9e5b8ef24d13de99"
 dependencies = [
 "bincode",
 "bitflags",
@@ -1695,7 +1812,7 @@ dependencies = [
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1613f6c6990011a4bc559e79aaf28d715f9f729b#1613f6c6990011a4bc559e79aaf28d715f9f729b"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=ff6112d7c70729be76eaad8c9e5b8ef24d13de99#ff6112d7c70729be76eaad8c9e5b8ef24d13de99"
 dependencies = [
 "ahash",
 "anyhow",
@@ -1743,6 +1860,22 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"

+[[package]]
+name = "sct"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d53dcdb7c9f8158937a7981b48accfd39a43af418591a5d008c7b22b5e1b7ca4"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93f6841e709003d68bb2deee8c343572bf446003ec20a583e76f7b15cebf3711"
+
 [[package]]
 name = "serde"
 version = "1.0.143"
@@ -1874,13 +2007,19 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+
 [[package]]
 name = "ssri"
 version = "7.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a9cec0d388f39fbe79d7aa600e8d38053bf97b1bc8d350da7c0ba800d0f423f2"
 dependencies = [
- "base64",
+ "base64 0.10.1",
 "digest 0.8.1",
 "hex 0.3.2",
 "serde",
@@ -2018,6 +2157,21 @@ dependencies = [
 "crunchy",
 ]

+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
 [[package]]
 name = "toml"
 version = "0.5.9"
@@ -2095,12 +2249,27 @@ dependencies = [
 "unic-common",
 ]

+[[package]]
+name = "unicode-bidi"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"

+[[package]]
+name = "unicode-normalization"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "854cbdc4f7bc6ae19c820d44abdc3277ac3e1b2b93db20a636825d9322fb60e6"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.3"
@@ -2113,6 +2282,56 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eec8e807a365e5c972debc47b8f06d361b37b94cfd18d48f7adc715fb86404dd"

+[[package]]
+name = "untrusted"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
+
+[[package]]
+name = "update-informer"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f154aee470c0882ea0f3b1cc2a46c5f4d24f282655f7b0cec065614fe24c447f"
+dependencies = [
+ "directories",
+ "semver",
+ "serde",
+ "serde_json",
+ "ureq",
+]
+
+[[package]]
+name = "ureq"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97acb4c28a254fd7a4aeec976c46a7fa404eac4d7c134b30c75144846d7cb8f"
+dependencies = [
+ "base64 0.13.0",
+ "chunked_transfer",
+ "flate2",
+ "log",
+ "once_cell",
+ "rustls",
+ "serde",
+ "serde_json",
+ "url",
+ "webpki",
+ "webpki-roots",
+]
+
+[[package]]
+name = "url"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507c383b2d33b5fc35d1861e77e6b383d158b2da5e14fe51b83dfedf6fd578c"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "value-bag"
 version = "1.0.0-alpha.9"
@@ -2240,6 +2459,25 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "webpki"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f095d78192e208183081cc07bc5515ef55216397af48b873e5edcd72637fa1bd"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
+[[package]]
+name = "webpki-roots"
+version = "0.22.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1c760f0d366a6c24a02ed7816e23e691f5d92291f94d15e836006fd11b04daf"
+dependencies = [
+ "webpki",
+]
+
 [[package]]
 name = "wepoll-ffi"
 version = "0.1.2"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.0.23"
+version = "0.0.26"
 edition = "2021"

 [lib]
@@ -18,15 +18,17 @@ common-path = { version = "1.0.0" }
 dirs = { version = "4.0.0" }
 fern = { version = "0.6.1" }
 filetime = { version = "0.2.17" }
-glob = { version = "0.3.0"}
+glob = { version = "0.3.0" }
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
+once_cell = { version = "1.13.1" }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1613f6c6990011a4bc559e79aaf28d715f9f729b" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "ff6112d7c70729be76eaad8c9e5b8ef24d13de99" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 toml = { version = "0.5.9" }
+update-informer = { version = "0.5.0", default_features = false, features = ["pypi"] }
 walkdir = { version = "2.3.2" }

 [profile.release]
--- a/README.md
+++ b/README.md
@@ -17,8 +17,9 @@ An extremely fast Python linter, written in Rust.
 - 🐍 Installable via `pip`
 - 🤝 Python 3.10 compatibility
 - 🛠️ `pyproject.toml` support
- 📦 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired cache semantics
- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` semantics
+- 📦 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired cache support
+- 🔧 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired `--fix` support
+- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` support

 _ruff is a proof-of-concept and not yet intended for production use. It supports only a small subset
 of the Flake8 rules, and may crash on your codebase._
@@ -51,6 +52,16 @@ You can run ruff in `--watch` mode to automatically re-run on-change:
 ruff path/to/code/ --watch
 ```

+ruff also works with [Pre-Commit](https://pre-commit.com) (requires Cargo on system):
+
+```yaml
+repos:
+- repo: https://github.com/charliermarsh/ruff
+  rev: v0.0.26
+  hooks:
+    - id: lint
+```
+
 ## Configuration

 ruff is configurable both via `pyproject.toml` and the command line.
@@ -75,7 +86,7 @@ ruff path/to/code/ --select F401 F403
 See `ruff --help` for more:

 ```shell
-ruff
+ruff (v0.0.26)
 An extremely fast Python linter.

 USAGE:
@@ -86,6 +97,7 @@ ARGS:

 OPTIONS:
    -e, --exit-zero             Exit with status code "0", even upon detecting errors
+    -f, --fix                   Attempt to automatically fix lint errors
    -h, --help                  Print help information
        --ignore <IGNORE>...    Comma-separated list of error codes to ignore
    -n, --no-cache              Disable cache reads
@@ -96,6 +108,37 @@ OPTIONS:
    -w, --watch                 Run in watch mode by re-running whenever files change
 ```

+### Compatibility with Black
+
+ruff is intended to be compatible with [Black](https://github.com/psf/black), and should be
+compatible out-of-the-box as long as the `line-length` setting is consistent between the two.
+
+As a project, ruff is designed to be used alongside Black and, as such, will defer implementing
+lint rules that are obviated by Black (e.g., stylistic rules).
+
+## Rules
+
+| Code | Name | Message |
+| ---- | ----- | ------- |
+| E402 | ModuleImportNotAtTopOfFile | Module level import not at top of file |
+| E501 | LineTooLong | Line too long |
+| F401 | UnusedImport | `...` imported but unused |
+| F403 | ImportStarUsage | Unable to detect undefined names |
+| F541 | FStringMissingPlaceholders | f-string without any placeholders |
+| F631 | AssertTuple | Assert test is a non-empty tuple, which is always `True` |
+| F634 | IfTuple | If test is a tuple, which is always `True` |
+| F704 | YieldOutsideFunction | a `yield` or `yield from` statement outside of a function/method |
+| F706 | ReturnOutsideFunction | a `return` statement outside of a function/method |
+| F707 | DefaultExceptNotLast | an `except:` block as not the last exception handler |
+| F821 | UndefinedName | Undefined name `...` |
+| F822 | UndefinedExport | Undefined name `...` in `__all__` |
+| F823 | UndefinedLocal | Local variable `...` referenced before assignment |
+| F831 | DuplicateArgumentName | Duplicate argument name in function definition |
+| F841 | UnusedVariable | Local variable `...` is assigned to but never used |
+| F901 | RaiseNotImplemented | `raise NotImplemented` should be `raise NotImplementedError` |
+| R001 | UselessObjectInheritance | Class `...` inherits from object |
+| R002 | NoAssertEquals | `assertEquals` is deprecated, use `assertEqual` instead |
+
 ## Development

 ruff is written in Rust (1.63.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
@@ -104,7 +147,7 @@ for development.
 Assuming you have `cargo` installed, you can run:

 ```shell
-cargo run resources/test/src
+cargo run resources/test/fixtures
 cargo fmt
 cargo clippy
 cargo test
@@ -131,46 +174,22 @@ Add this `pyproject.toml` to the CPython directory:
 [tool.linter]
 line-length = 88
 exclude = [
-    "Lib/ctypes/test/test_numbers.py",
-    "Lib/dataclasses.py",
    "Lib/lib2to3/tests/data/bom.py",
    "Lib/lib2to3/tests/data/crlf.py",
    "Lib/lib2to3/tests/data/different_encoding.py",
    "Lib/lib2to3/tests/data/false_encoding.py",
    "Lib/lib2to3/tests/data/py2_test_grammar.py",
-    "Lib/sqlite3/test/factory.py",
-    "Lib/sqlite3/test/hooks.py",
-    "Lib/sqlite3/test/regression.py",
-    "Lib/sqlite3/test/transactions.py",
-    "Lib/sqlite3/test/types.py",
    "Lib/test/bad_coding2.py",
    "Lib/test/badsyntax_3131.py",
    "Lib/test/badsyntax_pep3120.py",
    "Lib/test/encoded_modules/module_iso_8859_1.py",
    "Lib/test/encoded_modules/module_koi8_r.py",
-    "Lib/test/sortperf.py",
-    "Lib/test/test_email/torture_test.py",
    "Lib/test/test_fstring.py",
-    "Lib/test/test_genericpath.py",
-    "Lib/test/test_getopt.py",
    "Lib/test/test_grammar.py",
-    "Lib/test/test_htmlparser.py",
-    "Lib/test/test_importlib/stubs.py",
-    "Lib/test/test_importlib/test_files.py",
-    "Lib/test/test_importlib/test_metadata_api.py",
-    "Lib/test/test_importlib/test_open.py",
    "Lib/test/test_importlib/test_util.py",
    "Lib/test/test_named_expressions.py",
    "Lib/test/test_patma.py",
-    "Lib/test/test_peg_generator/__main__.py",
-    "Lib/test/test_pipes.py",
    "Lib/test/test_source_encoding.py",
-    "Lib/test/test_weakref.py",
-    "Lib/test/test_webbrowser.py",
-    "Lib/tkinter/__main__.py",
-    "Lib/tkinter/test/test_tkinter/test_variables.py",
-    "Modules/_decimal/libmpdec/literature/fnt.py",
-    "Modules/_decimal/tests/deccheck.py",
    "Tools/c-analyzer/c_parser/parser/_delim.py",
    "Tools/i18n/pygettext.py",
    "Tools/test2to3/maintest.py",
@@ -215,6 +234,7 @@ hyperfine --ignore-failure --warmup 5 \
 ```

 In order, these evaluate:
+
 - ruff
 - Pylint
 - PyFlakes
--- a/examples/generate_rules_table.rs
+++ b/examples/generate_rules_table.rs
@@ -0,0 +1,37 @@
+/// Generate a Markdown-compatible table of supported lint rules.
+use ruff::checks::CheckKind;
+
+fn main() {
+    let mut check_kinds: Vec<CheckKind> = vec![
+        CheckKind::AssertTuple,
+        CheckKind::DefaultExceptNotLast,
+        CheckKind::DuplicateArgumentName,
+        CheckKind::FStringMissingPlaceholders,
+        CheckKind::IfTuple,
+        CheckKind::ImportStarUsage,
+        CheckKind::LineTooLong,
+        CheckKind::ModuleImportNotAtTopOfFile,
+        CheckKind::NoAssertEquals,
+        CheckKind::RaiseNotImplemented,
+        CheckKind::ReturnOutsideFunction,
+        CheckKind::UndefinedExport("...".to_string()),
+        CheckKind::UndefinedLocal("...".to_string()),
+        CheckKind::UndefinedName("...".to_string()),
+        CheckKind::UnusedImport("...".to_string()),
+        CheckKind::UnusedVariable("...".to_string()),
+        CheckKind::UselessObjectInheritance("...".to_string()),
+        CheckKind::YieldOutsideFunction,
+    ];
+    check_kinds.sort_by_key(|check_kind| check_kind.code());
+
+    println!("| Code | Name | Message |");
+    println!("| ---- | ----- | ------- |");
+    for check_kind in check_kinds {
+        println!(
+            "| {} | {} | {} |",
+            check_kind.code().as_str(),
+            check_kind.name(),
+            check_kind.body()
+        );
+    }
+}
--- a/examples/print_ast.rs
+++ b/examples/print_ast.rs
@@ -0,0 +1,25 @@
+/// Print the AST for a given Python file.
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::{Parser, ValueHint};
+use rustpython_parser::parser;
+
+use ruff::fs;
+
+#[derive(Debug, Parser)]
+struct Cli {
+    #[clap(parse(from_os_str), value_hint = ValueHint::FilePath, required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let contents = fs::read_file(&cli.file)?;
+    let python_ast = parser::parse_program(&contents, &cli.file.to_string_lossy())?;
+
+    println!("{:#?}", python_ast);
+
+    Ok(())
+}
--- a/examples/print_tokens.rs
+++ b/examples/print_tokens.rs
@@ -0,0 +1,25 @@
+/// Print the token stream for a given Python file.
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::{Parser, ValueHint};
+use rustpython_parser::lexer;
+
+use ruff::fs;
+
+#[derive(Debug, Parser)]
+struct Cli {
+    #[clap(parse(from_os_str), value_hint = ValueHint::FilePath, required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let contents = fs::read_file(&cli.file)?;
+    for (_, tok, _) in lexer::make_tokenizer(&contents).flatten() {
+        println!("{:#?}", tok);
+    }
+
+    Ok(())
+}
--- a/resources/test/fixtures/E402.py
+++ b/resources/test/fixtures/E402.py
@@ -0,0 +1,28 @@
+"""Top-level docstring."""
+import a
+
+try:
+    import b
+except ImportError:
+    pass
+else:
+    pass
+
+import c
+
+if x > 0:
+    import d
+else:
+    import e
+
+y = x + 1
+
+import f
+
+
+def foo() -> None:
+    import e
+
+
+if __name__ == "__main__":
+    import g
--- a/resources/test/fixtures/E501.py
+++ b/resources/test/fixtures/E501.py
--- a/resources/test/fixtures/F401.py
+++ b/resources/test/fixtures/F401.py
@@ -1,3 +1,4 @@
+from __future__ import all_feature_names
 import os
 import functools
 from collections import (
@@ -10,9 +11,15 @@ import multiprocessing.process
 import logging.config
 import logging.handlers

+from blah import ClassA, ClassB, ClassC
+

 class X:
    def a(self) -> "namedtuple":
        x = os.environ["1"]
        y = Counter()
        z = multiprocessing.pool.ThreadPool()
+
+
+__all__ = ["ClassA"] + ["ClassB"]
+__all__ += ["ClassC"]
--- a/resources/test/fixtures/F403.py
+++ b/resources/test/fixtures/F403.py
--- a/resources/test/fixtures/F541.py
+++ b/resources/test/fixtures/F541.py
--- a/resources/test/fixtures/F631.py
+++ b/resources/test/fixtures/F631.py
@@ -0,0 +1,4 @@
+assert (False, "x")
+assert (False,)
+assert ()
+assert True
--- a/resources/test/fixtures/F634.py
+++ b/resources/test/fixtures/F634.py
@@ -6,3 +6,5 @@ for _ in range(5):
        pass
    elif (3, 4):
        pass
+    elif ():
+        pass
--- a/resources/test/fixtures/F704.py
+++ b/resources/test/fixtures/F704.py
--- a/resources/test/fixtures/F706.py
+++ b/resources/test/fixtures/F706.py
--- a/resources/test/fixtures/F707.py
+++ b/resources/test/fixtures/F707.py
@@ -0,0 +1,46 @@
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+finally:
+    pass
+
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+else:
+    pass
+
+try:
+    pass
+except:
+    pass
+
+try:
+    pass
+except ValueError:
+    pass
+except:
+    pass
+
+try:
+    pass
+except ValueError:
+    pass
+
+try:
+    pass
+finally:
+    pass
--- a/resources/test/fixtures/F821.py
+++ b/resources/test/fixtures/F821.py
--- a/resources/test/fixtures/F822.py
+++ b/resources/test/fixtures/F822.py
@@ -0,0 +1,3 @@
+a = 1
+
+__all__ = ["a", "b"]
--- a/resources/test/fixtures/F823.py
+++ b/resources/test/fixtures/F823.py
@@ -15,3 +15,13 @@ def baz():
    global my_var
    global my_dict
    my_dict[my_var] += 1
+
+
+def dec(x):
+    return x
+
+
+@dec
+def f():
+    dec = 1
+    return dec
--- a/resources/test/fixtures/F831.py
+++ b/resources/test/fixtures/F831.py
--- a/resources/test/fixtures/F841.py
+++ b/resources/test/fixtures/F841.py
--- a/resources/test/fixtures/F901.py
+++ b/resources/test/fixtures/F901.py
--- a/resources/test/fixtures/R001.py
+++ b/resources/test/fixtures/R001.py
@@ -0,0 +1,141 @@
+class A:
+    ...
+
+
+class A(object):
+    ...
+
+
+class A(
+    object,
+):
+    ...
+
+
+class A(
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+):
+    ...
+
+
+class A(
+    #
+    object
+):
+    ...
+
+
+class A(
+    object
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object
+    #
+):
+    ...
+
+
+class A(
+    #
+    object
+    #
+):
+    ...
+
+
+class B(A, object):
+    ...
+
+
+class B(object, A):
+    ...
+
+
+class B(
+    object,
+    A,
+):
+    ...
+
+
+class B(
+    A,
+    object,
+):
+    ...
+
+
+class B(
+    object,
+    # Comment on A.
+    A,
+):
+    ...
+
+
+class B(
+    # Comment on A.
+    A,
+    object,
+):
+    ...
+
+
+def f():
+    class A(object):
+        ...
+
+
+class A(
+    object,
+):
+    ...
+
+
+class A(
+    object,  # )
+):
+    ...
+
+
+class A(
+    object  # )
+    ,
+):
+    ...
+
+
+object = A
+
+
+class B(object):
+    ...
--- a/resources/test/fixtures/R002.py
+++ b/resources/test/fixtures/R002.py
@@ -0,0 +1,3 @@
+self.assertEquals (1, 2)
+self.assertEquals(1, 2)
+self.assertEqual(3, 4)
--- a/resources/test/fixtures/init.py
+++ b/resources/test/fixtures/init.py
--- a/resources/test/fixtures/bar/init.py
+++ b/resources/test/fixtures/bar/init.py
--- a/resources/test/fixtures/bar/migrations/init.py
+++ b/resources/test/fixtures/bar/migrations/init.py
--- a/resources/test/fixtures/bar/migrations/migration.py
+++ b/resources/test/fixtures/bar/migrations/migration.py
--- a/resources/test/fixtures/excluded.py
+++ b/resources/test/fixtures/excluded.py
--- a/resources/test/fixtures/foo/init.py
+++ b/resources/test/fixtures/foo/init.py
--- a/resources/test/fixtures/foo/migrations/init.py
+++ b/resources/test/fixtures/foo/migrations/init.py
--- a/resources/test/fixtures/foo/migrations/migration.py
+++ b/resources/test/fixtures/foo/migrations/migration.py
--- a/resources/test/fixtures/pyproject.toml
+++ b/resources/test/fixtures/pyproject.toml
@@ -2,16 +2,22 @@
 line-length = 88
 exclude = ["excluded.py", "**/migrations"]
 select = [
+    "E402",
    "E501",
    "F401",
    "F403",
    "F541",
+    "F631",
    "F634",
    "F704",
    "F706",
+    "F707",
    "F821",
+    "F822",
+    "F823",
    "F831",
-    "F832",
    "F841",
    "F901",
+    "R001",
+    "R002",
 ]
--- a/src/ast_ops.rs
+++ b/src/ast_ops.rs
@@ -0,0 +1,148 @@
+use std::collections::BTreeMap;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use rustpython_parser::ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
+
+fn id() -> usize {
+    static COUNTER: AtomicUsize = AtomicUsize::new(1);
+    COUNTER.fetch_add(1, Ordering::Relaxed)
+}
+
+pub enum ScopeKind {
+    Class,
+    Function,
+    Generator,
+    Module,
+}
+
+pub struct Scope {
+    pub id: usize,
+    pub kind: ScopeKind,
+    pub values: BTreeMap<String, Binding>,
+}
+
+impl Scope {
+    pub fn new(kind: ScopeKind) -> Self {
+        Scope {
+            id: id(),
+            kind,
+            values: BTreeMap::new(),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub enum BindingKind {
+    Argument,
+    Assignment,
+    Builtin,
+    ClassDefinition,
+    Definition,
+    Export(Vec<String>),
+    FutureImportation,
+    Importation(String),
+    StarImportation,
+    SubmoduleImportation(String),
+}
+
+#[derive(Clone, Debug)]
+pub struct Binding {
+    pub kind: BindingKind,
+    pub location: Location,
+    pub used: Option<usize>,
+}
+
+/// Extract the names bound to a given __all__ assignment.
+pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
+    let mut names: Vec<String> = vec![];
+
+    fn add_to_names(names: &mut Vec<String>, elts: &[Expr]) {
+        for elt in elts {
+            if let ExprKind::Constant {
+                value: Constant::Str(value),
+                ..
+            } = &elt.node
+            {
+                names.push(value.to_string())
+            }
+        }
+    }
+
+    // Grab the existing bound __all__ values.
+    if let StmtKind::AugAssign { .. } = &stmt.node {
+        if let Some(binding) = scope.values.get("__all__") {
+            if let BindingKind::Export(existing) = &binding.kind {
+                names.extend(existing.clone());
+            }
+        }
+    }
+
+    if let Some(value) = match &stmt.node {
+        StmtKind::Assign { value, .. } => Some(value),
+        StmtKind::AnnAssign { value, .. } => value.as_ref(),
+        StmtKind::AugAssign { value, .. } => Some(value),
+        _ => None,
+    } {
+        match &value.node {
+            ExprKind::List { elts, .. } | ExprKind::Tuple { elts, .. } => {
+                add_to_names(&mut names, elts)
+            }
+            ExprKind::BinOp { left, right, .. } => {
+                let mut current_left = left;
+                let mut current_right = right;
+                while let Some(elts) = match &current_right.node {
+                    ExprKind::List { elts, .. } => Some(elts),
+                    ExprKind::Tuple { elts, .. } => Some(elts),
+                    _ => None,
+                } {
+                    add_to_names(&mut names, elts);
+                    match &current_left.node {
+                        ExprKind::BinOp { left, right, .. } => {
+                            current_left = left;
+                            current_right = right;
+                        }
+                        ExprKind::List { elts, .. } | ExprKind::Tuple { elts, .. } => {
+                            add_to_names(&mut names, elts);
+                            break;
+                        }
+                        _ => break,
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
+    names
+}
+
+/// Struct used to efficiently slice source code at (row, column) Locations.
+pub struct SourceCodeLocator<'a> {
+    content: &'a str,
+    offsets: Vec<usize>,
+    initialized: bool,
+}
+
+impl<'a> SourceCodeLocator<'a> {
+    pub fn new(content: &'a str) -> Self {
+        SourceCodeLocator {
+            content,
+            offsets: vec![],
+            initialized: false,
+        }
+    }
+
+    pub fn slice_source_code(&mut self, location: &Location) -> &'a str {
+        if !self.initialized {
+            let mut offset = 0;
+            for i in self.content.lines() {
+                self.offsets.push(offset);
+                offset += i.len();
+                offset += 1;
+            }
+            self.initialized = true;
+        }
+        let offset = self.offsets[location.row() - 1] + location.column() - 1;
+        &self.content[offset..]
+    }
+}
--- a/src/autofix.rs
+++ b/src/autofix.rs
@@ -0,0 +1,216 @@
+use std::fs;
+use std::path::Path;
+
+use anyhow::Result;
+use rustpython_parser::ast::Location;
+
+use crate::checks::{Check, Fix};
+
+#[derive(Hash)]
+pub enum Mode {
+    Generate,
+    Apply,
+    None,
+}
+
+impl From<bool> for Mode {
+    fn from(value: bool) -> Self {
+        match value {
+            true => Mode::Apply,
+            false => Mode::None,
+        }
+    }
+}
+
+/// Auto-fix errors in a file, and write the fixed source code to disk.
+pub fn fix_file(checks: &mut [Check], contents: &str, path: &Path) -> Result<()> {
+    if checks.iter().all(|check| check.fix.is_none()) {
+        return Ok(());
+    }
+
+    let output = apply_fixes(
+        checks.iter_mut().filter_map(|check| check.fix.as_mut()),
+        contents,
+    );
+
+    fs::write(path, output).map_err(|e| e.into())
+}
+
+/// Apply a series of fixes.
+fn apply_fixes<'a>(fixes: impl Iterator<Item = &'a mut Fix>, contents: &str) -> String {
+    let lines: Vec<&str> = contents.lines().collect();
+
+    let mut output = "".to_string();
+    let mut last_pos: Location = Location::new(0, 0);
+
+    for fix in fixes {
+        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
+        if last_pos > fix.start {
+            continue;
+        }
+
+        if fix.start.row() > last_pos.row() {
+            if last_pos.row() > 0 || last_pos.column() > 0 {
+                output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
+                output.push('\n');
+            }
+            for line in &lines[last_pos.row()..fix.start.row() - 1] {
+                output.push_str(line);
+                output.push('\n');
+            }
+            output.push_str(&lines[fix.start.row() - 1][..fix.start.column() - 1]);
+            output.push_str(&fix.content);
+        } else {
+            output.push_str(
+                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.start.column() - 1],
+            );
+            output.push_str(&fix.content);
+        }
+
+        last_pos = fix.end;
+        fix.applied = true;
+    }
+
+    if last_pos.row() > 0 || last_pos.column() > 0 {
+        output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
+        output.push('\n');
+    }
+    for line in &lines[last_pos.row()..] {
+        output.push_str(line);
+        output.push('\n');
+    }
+
+    output
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use rustpython_parser::ast::Location;
+
+    use crate::autofix::apply_fixes;
+    use crate::checks::Fix;
+
+    #[test]
+    fn empty_file() -> Result<()> {
+        let mut fixes = vec![];
+        let actual = apply_fixes(fixes.iter_mut(), "");
+        let expected = "";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_single_replacement() -> Result<()> {
+        let mut fixes = vec![Fix {
+            content: "Bar".to_string(),
+            start: Location::new(1, 9),
+            end: Location::new(1, 15),
+            applied: false,
+        }];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+        ...
+",
+        );
+
+        let expected = "class A(Bar):
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_single_removal() -> Result<()> {
+        let mut fixes = vec![Fix {
+            content: "".to_string(),
+            start: Location::new(1, 8),
+            end: Location::new(1, 16),
+            applied: false,
+        }];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+        ...
+",
+        );
+
+        let expected = "class A:
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_double_removal() -> Result<()> {
+        let mut fixes = vec![
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 8),
+                end: Location::new(1, 17),
+                applied: false,
+            },
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 17),
+                end: Location::new(1, 24),
+                applied: false,
+            },
+        ];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object, object):
+        ...
+",
+        );
+
+        let expected = "class A:
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn ignore_overlapping_fixes() -> Result<()> {
+        let mut fixes = vec![
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 8),
+                end: Location::new(1, 16),
+                applied: false,
+            },
+            Fix {
+                content: "ignored".to_string(),
+                start: Location::new(1, 10),
+                end: Location::new(1, 12),
+                applied: false,
+            },
+        ];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+    ...
+",
+        );
+
+        let expected = "class A:
+    ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,7 +1,9 @@
 use std::collections::hash_map::DefaultHasher;
+use std::fs::Metadata;
 use std::hash::{Hash, Hasher};
 use std::path::Path;

+use crate::autofix;
 use cacache::Error::EntryNotFound;
 use filetime::FileTime;
 use log::error;
@@ -69,9 +71,10 @@ fn cache_dir() -> &'static str {
    "./.ruff_cache"
 }

-fn cache_key(path: &Path, settings: &Settings) -> String {
+fn cache_key(path: &Path, settings: &Settings, autofix: &autofix::Mode) -> String {
    let mut hasher = DefaultHasher::new();
    settings.hash(&mut hasher);
+    autofix.hash(&mut hasher);
    format!(
        "{}@{}@{}",
        path.canonicalize().unwrap().to_string_lossy(),
@@ -80,22 +83,28 @@ fn cache_key(path: &Path, settings: &Settings) -> String {
    )
 }

-pub fn get(path: &Path, settings: &Settings, mode: &Mode) -> Option<Vec<Message>> {
+pub fn get(
+    path: &Path,
+    metadata: &Metadata,
+    settings: &Settings,
+    autofix: &autofix::Mode,
+    mode: &Mode,
+) -> Option<Vec<Message>> {
    if !mode.allow_read() {
        return None;
    };

-    match cacache::read_sync(cache_dir(), cache_key(path, settings)) {
-        Ok(encoded) => match path.metadata() {
-            Ok(m) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
-                Ok(CheckResult { metadata, messages }) => {
-                    if FileTime::from_last_modification_time(&m).unix_seconds() == metadata.mtime {
-                        return Some(messages);
-                    }
+    match cacache::read_sync(cache_dir(), cache_key(path, settings, autofix)) {
+        Ok(encoded) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
+            Ok(CheckResult {
+                metadata: CacheMetadata { mtime },
+                messages,
+            }) => {
+                if FileTime::from_last_modification_time(metadata).unix_seconds() == mtime {
+                    return Some(messages);
                }
-                Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
-            },
-            Err(e) => error!("Failed to read metadata from path: {e:?}"),
+            }
+            Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
        },
        Err(EntryNotFound(_, _)) => {}
        Err(e) => error!("Failed to read from cache: {e:?}"),
@@ -103,24 +112,29 @@ pub fn get(path: &Path, settings: &Settings, mode: &Mode) -> Option<Vec<Message>
    None
 }

-pub fn set(path: &Path, settings: &Settings, messages: &[Message], mode: &Mode) {
+pub fn set(
+    path: &Path,
+    metadata: &Metadata,
+    settings: &Settings,
+    autofix: &autofix::Mode,
+    messages: &[Message],
+    mode: &Mode,
+) {
    if !mode.allow_write() {
        return;
    };

-    if let Ok(metadata) = path.metadata() {
-        let check_result = CheckResultRef {
-            metadata: &CacheMetadata {
-                mtime: FileTime::from_last_modification_time(&metadata).unix_seconds(),
-            },
-            messages,
-        };
-        if let Err(e) = cacache::write_sync(
-            cache_dir(),
-            cache_key(path, settings),
-            bincode::serialize(&check_result).unwrap(),
-        ) {
-            error!("Failed to write to cache: {e:?}")
-        }
+    let check_result = CheckResultRef {
+        metadata: &CacheMetadata {
+            mtime: FileTime::from_last_modification_time(metadata).unix_seconds(),
+        },
+        messages,
+    };
+    if let Err(e) = cacache::write_sync(
+        cache_dir(),
+        cache_key(path, settings, autofix),
+        bincode::serialize(&check_result).unwrap(),
+    ) {
+        error!("Failed to write to cache: {e:?}")
    }
 }
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -1,5 +1,5 @@
-use std::collections::{BTreeMap, BTreeSet};
-use std::sync::atomic::{AtomicUsize, Ordering};
+use std::collections::BTreeSet;
+use std::path::Path;

 use rustpython_parser::ast::{
    Arg, Arguments, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprContext, ExprKind,
@@ -7,81 +7,50 @@ use rustpython_parser::ast::{
 };
 use rustpython_parser::parser;

+use crate::ast_ops::{
+    extract_all_names, Binding, BindingKind, Scope, ScopeKind, SourceCodeLocator,
+};
 use crate::builtins::{BUILTINS, MAGIC_GLOBALS};
-use crate::check_ast::ScopeKind::{Class, Function, Generator, Module};
-use crate::checks::{Check, CheckCode, CheckKind};
+use crate::checks::{Check, CheckCode, CheckKind, Fix};
 use crate::settings::Settings;
-use crate::visitor;
 use crate::visitor::{walk_excepthandler, Visitor};
-
-fn id() -> usize {
-    static COUNTER: AtomicUsize = AtomicUsize::new(1);
-    COUNTER.fetch_add(1, Ordering::Relaxed)
-}
-
-enum ScopeKind {
-    Class,
-    Function,
-    Generator,
-    Module,
-}
-
-struct Scope {
-    id: usize,
-    kind: ScopeKind,
-    values: BTreeMap<String, Binding>,
-}
-
-impl Scope {
-    fn new(kind: ScopeKind) -> Self {
-        Scope {
-            id: id(),
-            kind,
-            values: BTreeMap::new(),
-        }
-    }
-}
-
-#[derive(Clone)]
-enum BindingKind {
-    Argument,
-    Assignment,
-    Definition,
-    ClassDefinition,
-    Builtin,
-    FutureImportation,
-    Importation(String),
-    StarImportation,
-    SubmoduleImportation(String),
-}
-
-#[derive(Clone)]
-struct Binding {
-    kind: BindingKind,
-    location: Location,
-    used: Option<usize>,
-}
+use crate::{autofix, fixer, visitor};

 struct Checker<'a> {
+    locator: SourceCodeLocator<'a>,
    settings: &'a Settings,
+    autofix: &'a autofix::Mode,
+    path: &'a str,
    checks: Vec<Check>,
    scopes: Vec<Scope>,
    dead_scopes: Vec<Scope>,
    deferred: Vec<String>,
    in_f_string: bool,
    in_annotation: bool,
+    seen_non_import: bool,
+    seen_docstring: bool,
 }

 impl Checker<'_> {
-    pub fn new(settings: &Settings) -> Checker {
+    pub fn new<'a>(
+        settings: &'a Settings,
+        autofix: &'a autofix::Mode,
+        path: &'a str,
+        content: &'a str,
+    ) -> Checker<'a> {
        Checker {
            settings,
+            autofix,
+            path,
+            locator: SourceCodeLocator::new(content),
            checks: vec![],
            scopes: vec![],
            dead_scopes: vec![],
            deferred: vec![],
            in_f_string: false,
            in_annotation: false,
+            seen_non_import: false,
+            seen_docstring: false,
        }
    }
 }
@@ -109,18 +78,24 @@ impl Visitor for Checker<'_> {
                    }
                }
            }
-            StmtKind::FunctionDef { name, .. } => {
-                self.add_binding(
-                    name.to_string(),
-                    Binding {
-                        kind: BindingKind::Definition,
-                        used: None,
-                        location: stmt.location,
-                    },
-                );
-                self.push_scope(Scope::new(Function));
+            StmtKind::FunctionDef {
+                name,
+                decorator_list,
+                returns,
+                ..
            }
-            StmtKind::AsyncFunctionDef { name, .. } => {
+            | StmtKind::AsyncFunctionDef {
+                name,
+                decorator_list,
+                returns,
+                ..
+            } => {
+                for expr in decorator_list {
+                    self.visit_expr(expr, Some(stmt));
+                }
+                for expr in returns {
+                    self.visit_annotation(expr);
+                }
                self.add_binding(
                    name.to_string(),
                    Binding {
@@ -129,7 +104,7 @@ impl Visitor for Checker<'_> {
                        location: stmt.location,
                    },
                );
-                self.push_scope(Scope::new(Function));
+                self.push_scope(Scope::new(ScopeKind::Function));
            }
            StmtKind::Return { .. } => {
                if self
@@ -139,19 +114,87 @@ impl Visitor for Checker<'_> {
                {
                    if let Some(scope) = self.scopes.last() {
                        match scope.kind {
-                            Class | Module => {
-                                self.checks.push(Check {
-                                    kind: CheckKind::ReturnOutsideFunction,
-                                    location: stmt.location,
-                                });
+                            ScopeKind::Class | ScopeKind::Module => {
+                                self.checks.push(Check::new(
+                                    CheckKind::ReturnOutsideFunction,
+                                    stmt.location,
+                                ));
                            }
                            _ => {}
                        }
                    }
                }
            }
-            StmtKind::ClassDef { .. } => self.push_scope(Scope::new(Class)),
+            StmtKind::ClassDef {
+                name,
+                bases,
+                keywords,
+                decorator_list,
+                ..
+            } => {
+                if self.settings.select.contains(&CheckCode::R001) {
+                    for expr in bases {
+                        if let ExprKind::Name { id, .. } = &expr.node {
+                            if id == "object" {
+                                let scope = self.scopes.last().expect("No current scope found.");
+                                match scope.values.get(id) {
+                                    None
+                                    | Some(Binding {
+                                        kind: BindingKind::Builtin,
+                                        ..
+                                    }) => {
+                                        let mut check = Check::new(
+                                            CheckKind::UselessObjectInheritance(name.to_string()),
+                                            expr.location,
+                                        );
+                                        if matches!(self.autofix, autofix::Mode::Generate)
+                                            || matches!(self.autofix, autofix::Mode::Apply)
+                                        {
+                                            if let Some(fix) = fixer::remove_class_def_base(
+                                                &mut self.locator,
+                                                &stmt.location,
+                                                expr.location,
+                                                bases,
+                                                keywords,
+                                            ) {
+                                                check.amend(fix);
+                                            }
+                                        } else {
+                                        }
+                                        self.checks.push(check);
+                                    }
+                                    _ => {}
+                                }
+                            }
+                        }
+                    }
+                }
+
+                for expr in bases {
+                    self.visit_expr(expr, Some(stmt))
+                }
+                for keyword in keywords {
+                    self.visit_keyword(keyword)
+                }
+                for expr in decorator_list {
+                    self.visit_expr(expr, Some(stmt))
+                }
+                self.push_scope(Scope::new(ScopeKind::Class))
+            }
            StmtKind::Import { names } => {
+                if self
+                    .settings
+                    .select
+                    .contains(CheckKind::ModuleImportNotAtTopOfFile.code())
+                    && self.seen_non_import
+                    && stmt.location.column() == 1
+                {
+                    self.checks.push(Check::new(
+                        CheckKind::ModuleImportNotAtTopOfFile,
+                        stmt.location,
+                    ));
+                }
+
                for alias in names {
                    if alias.node.name.contains('.') && alias.node.asname.is_none() {
                        // TODO(charlie): Multiple submodule imports with the same parent module
@@ -189,18 +232,30 @@ impl Visitor for Checker<'_> {
                }
            }
            StmtKind::ImportFrom { names, module, .. } => {
+                if self
+                    .settings
+                    .select
+                    .contains(CheckKind::ModuleImportNotAtTopOfFile.code())
+                    && self.seen_non_import
+                    && stmt.location.column() == 1
+                {
+                    self.checks.push(Check::new(
+                        CheckKind::ModuleImportNotAtTopOfFile,
+                        stmt.location,
+                    ));
+                }
+
                for alias in names {
                    let name = alias
                        .node
                        .asname
                        .clone()
                        .unwrap_or_else(|| alias.node.name.clone());
-                    if let Some("future") = module.as_deref() {
+                    if let Some("__future__") = module.as_deref() {
                        self.add_binding(
                            name,
                            Binding {
                                kind: BindingKind::FutureImportation,
-
                                used: Some(self.scopes.last().expect("No current scope found.").id),
                                location: stmt.location,
                            },
@@ -210,7 +265,6 @@ impl Visitor for Checker<'_> {
                            name,
                            Binding {
                                kind: BindingKind::StarImportation,
-
                                used: None,
                                location: stmt.location,
                            },
@@ -221,10 +275,8 @@ impl Visitor for Checker<'_> {
                            .select
                            .contains(CheckKind::ImportStarUsage.code())
                        {
-                            self.checks.push(Check {
-                                kind: CheckKind::ImportStarUsage,
-                                location: stmt.location,
-                            });
+                            self.checks
+                                .push(Check::new(CheckKind::ImportStarUsage, stmt.location));
                        }
                    } else {
                        let binding = Binding {
@@ -241,11 +293,11 @@ impl Visitor for Checker<'_> {
            }
            StmtKind::If { test, .. } => {
                if self.settings.select.contains(CheckKind::IfTuple.code()) {
-                    if let ExprKind::Tuple { .. } = test.node {
-                        self.checks.push(Check {
-                            kind: CheckKind::IfTuple,
-                            location: stmt.location,
-                        });
+                    if let ExprKind::Tuple { elts, .. } = &test.node {
+                        if !elts.is_empty() {
+                            self.checks
+                                .push(Check::new(CheckKind::IfTuple, stmt.location));
+                        }
                    }
                }
            }
@@ -260,19 +312,19 @@ impl Visitor for Checker<'_> {
                            ExprKind::Call { func, .. } => {
                                if let ExprKind::Name { id, .. } = &func.node {
                                    if id == "NotImplemented" {
-                                        self.checks.push(Check {
-                                            kind: CheckKind::RaiseNotImplemented,
-                                            location: stmt.location,
-                                        });
+                                        self.checks.push(Check::new(
+                                            CheckKind::RaiseNotImplemented,
+                                            stmt.location,
+                                        ));
                                    }
                                }
                            }
                            ExprKind::Name { id, .. } => {
                                if id == "NotImplemented" {
-                                    self.checks.push(Check {
-                                        kind: CheckKind::RaiseNotImplemented,
-                                        location: stmt.location,
-                                    });
+                                    self.checks.push(Check::new(
+                                        CheckKind::RaiseNotImplemented,
+                                        stmt.location,
+                                    ));
                                }
                            }
                            _ => {}
@@ -280,7 +332,54 @@ impl Visitor for Checker<'_> {
                    }
                }
            }
-            StmtKind::AugAssign { target, .. } => self.handle_node_load(target),
+            StmtKind::AugAssign { target, .. } => {
+                self.seen_non_import = true;
+                self.handle_node_load(target);
+            }
+            StmtKind::Assert { test, .. } => {
+                self.seen_non_import = true;
+                if self.settings.select.contains(CheckKind::AssertTuple.code()) {
+                    if let ExprKind::Tuple { elts, .. } = &test.node {
+                        if !elts.is_empty() {
+                            self.checks
+                                .push(Check::new(CheckKind::AssertTuple, stmt.location));
+                        }
+                    }
+                }
+            }
+            StmtKind::Try { handlers, .. } => {
+                if self
+                    .settings
+                    .select
+                    .contains(CheckKind::DefaultExceptNotLast.code())
+                {
+                    for (idx, handler) in handlers.iter().enumerate() {
+                        let ExcepthandlerKind::ExceptHandler { type_, .. } = &handler.node;
+                        if type_.is_none() && idx < handlers.len() - 1 {
+                            self.checks.push(Check::new(
+                                CheckKind::DefaultExceptNotLast,
+                                handler.location,
+                            ));
+                        }
+                    }
+                }
+            }
+            StmtKind::Expr { value } => {
+                if !self.seen_docstring {
+                    if let ExprKind::Constant {
+                        value: Constant::Str(_),
+                        ..
+                    } = &value.node
+                    {
+                        self.seen_docstring = true;
+                    }
+                } else {
+                    self.seen_non_import = true;
+                }
+            }
+            StmtKind::Delete { .. } | StmtKind::Assign { .. } | StmtKind::AnnAssign { .. } => {
+                self.seen_non_import = true;
+            }
            _ => {}
        }

@@ -304,10 +403,10 @@ impl Visitor for Checker<'_> {
                        && name != "__traceback_supplement__"
                        && matches!(binding.kind, BindingKind::Assignment)
                    {
-                        self.checks.push(Check {
-                            kind: CheckKind::UnusedVariable(name.to_string()),
-                            location: binding.location,
-                        });
+                        self.checks.push(Check::new(
+                            CheckKind::UnusedVariable(name.to_string()),
+                            binding.location,
+                        ));
                    }
                }

@@ -332,23 +431,54 @@ impl Visitor for Checker<'_> {
    fn visit_annotation(&mut self, expr: &Expr) {
        let initial = self.in_annotation;
        self.in_annotation = true;
-        self.visit_expr(expr);
+        self.visit_expr(expr, None);
        self.in_annotation = initial;
    }

-    fn visit_expr(&mut self, expr: &Expr) {
+    fn visit_expr(&mut self, expr: &Expr, parent: Option<&Stmt>) {
        let initial = self.in_f_string;
        match &expr.node {
            ExprKind::Name { ctx, .. } => match ctx {
                ExprContext::Load => self.handle_node_load(expr),
-                ExprContext::Store => self.handle_node_store(expr),
+                ExprContext::Store => self.handle_node_store(expr, parent),
                ExprContext::Del => self.handle_node_delete(expr),
            },
+            ExprKind::Call { func, .. } => {
+                if self.settings.select.contains(&CheckCode::R002) {
+                    if let ExprKind::Attribute { value, attr, .. } = &func.node {
+                        if attr == "assertEquals" {
+                            if let ExprKind::Name { id, .. } = &value.node {
+                                if id == "self" {
+                                    let mut check =
+                                        Check::new(CheckKind::NoAssertEquals, expr.location);
+                                    if matches!(self.autofix, autofix::Mode::Generate)
+                                        || matches!(self.autofix, autofix::Mode::Apply)
+                                    {
+                                        check.amend(Fix {
+                                            content: "assertEqual".to_string(),
+                                            start: Location::new(
+                                                func.location.row(),
+                                                func.location.column() + 1,
+                                            ),
+                                            end: Location::new(
+                                                func.location.row(),
+                                                func.location.column() + 1 + "assertEquals".len(),
+                                            ),
+                                            applied: false,
+                                        });
+                                    }
+                                    self.checks.push(check);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
            ExprKind::GeneratorExp { .. }
            | ExprKind::ListComp { .. }
            | ExprKind::DictComp { .. }
-            | ExprKind::SetComp { .. } => self.push_scope(Scope::new(Generator)),
-            ExprKind::Lambda { .. } => self.push_scope(Scope::new(Function)),
+            | ExprKind::SetComp { .. } => self.push_scope(Scope::new(ScopeKind::Generator)),
+            ExprKind::Lambda { .. } => self.push_scope(Scope::new(ScopeKind::Function)),
            ExprKind::Yield { .. } | ExprKind::YieldFrom { .. } => {
                let scope = self.scopes.last().expect("No current scope found.");
                if self
@@ -358,10 +488,8 @@ impl Visitor for Checker<'_> {
                    && matches!(scope.kind, ScopeKind::Class)
                    || matches!(scope.kind, ScopeKind::Module)
                {
-                    self.checks.push(Check {
-                        kind: CheckKind::YieldOutsideFunction,
-                        location: expr.location,
-                    });
+                    self.checks
+                        .push(Check::new(CheckKind::YieldOutsideFunction, expr.location));
                }
            }
            ExprKind::JoinedStr { values } => {
@@ -374,10 +502,10 @@ impl Visitor for Checker<'_> {
                        .iter()
                        .any(|value| matches!(value.node, ExprKind::FormattedValue { .. }))
                {
-                    self.checks.push(Check {
-                        kind: CheckKind::FStringMissingPlaceholders,
-                        location: expr.location,
-                    });
+                    self.checks.push(Check::new(
+                        CheckKind::FStringMissingPlaceholders,
+                        expr.location,
+                    ));
                }
                self.in_f_string = true;
            }
@@ -413,24 +541,30 @@ impl Visitor for Checker<'_> {
                Some(name) => {
                    let scope = self.scopes.last().expect("No current scope found.");
                    if scope.values.contains_key(name) {
-                        self.handle_node_store(&Expr::new(
+                        self.handle_node_store(
+                            &Expr::new(
+                                excepthandler.location,
+                                ExprKind::Name {
+                                    id: name.to_string(),
+                                    ctx: ExprContext::Store,
+                                },
+                            ),
+                            None,
+                        );
+                    }
+
+                    let scope = self.scopes.last().expect("No current scope found.");
+                    let prev_definition = scope.values.get(name).cloned();
+                    self.handle_node_store(
+                        &Expr::new(
                            excepthandler.location,
                            ExprKind::Name {
                                id: name.to_string(),
                                ctx: ExprContext::Store,
                            },
-                        ));
-                    }
-
-                    let scope = self.scopes.last().expect("No current scope found.");
-                    let prev_definition = scope.values.get(name).cloned();
-                    self.handle_node_store(&Expr::new(
-                        excepthandler.location,
-                        ExprKind::Name {
-                            id: name.to_string(),
-                            ctx: ExprContext::Store,
-                        },
-                    ));
+                        ),
+                        None,
+                    );

                    walk_excepthandler(self, excepthandler);

@@ -438,10 +572,10 @@ impl Visitor for Checker<'_> {
                    if let Some(binding) = scope.values.remove(name) {
                        if self.settings.select.contains(&CheckCode::F841) && binding.used.is_none()
                        {
-                            self.checks.push(Check {
-                                kind: CheckKind::UnusedVariable(name.to_string()),
-                                location: excepthandler.location,
-                            });
+                            self.checks.push(Check::new(
+                                CheckKind::UnusedVariable(name.to_string()),
+                                excepthandler.location,
+                            ));
                        }
                    }

@@ -479,10 +613,8 @@ impl Visitor for Checker<'_> {
            for arg in all_arguments {
                let ident = &arg.node.arg;
                if idents.contains(ident.as_str()) {
-                    self.checks.push(Check {
-                        kind: CheckKind::DuplicateArgumentName,
-                        location: arg.location,
-                    });
+                    self.checks
+                        .push(Check::new(CheckKind::DuplicateArgumentName, arg.location));
                    break;
                }
                idents.insert(ident);
@@ -559,7 +691,7 @@ impl Checker<'_> {
            let mut first_iter = true;
            let mut in_generators = false;
            for scope in self.scopes.iter_mut().rev() {
-                if matches!(scope.kind, Class) {
+                if matches!(scope.kind, ScopeKind::Class) {
                    if id == "__class__" {
                        return;
                    } else if !first_iter && !in_generators {
@@ -572,38 +704,41 @@ impl Checker<'_> {
                }

                first_iter = false;
-                in_generators = matches!(scope.kind, Generator);
+                in_generators = matches!(scope.kind, ScopeKind::Generator);
            }

            if self.settings.select.contains(&CheckCode::F821) {
-                self.checks.push(Check {
-                    kind: CheckKind::UndefinedName(id.clone()),
-                    location: expr.location,
-                })
+                self.checks.push(Check::new(
+                    CheckKind::UndefinedName(id.clone()),
+                    expr.location,
+                ))
            }
        }
    }

-    fn handle_node_store(&mut self, expr: &Expr) {
+    fn handle_node_store(&mut self, expr: &Expr, parent: Option<&Stmt>) {
        if let ExprKind::Name { id, .. } = &expr.node {
-            if self.settings.select.contains(&CheckCode::F832) {
-                let current = self.scopes.last().expect("No current scope found.");
-                if matches!(current.kind, ScopeKind::Function) && !current.values.contains_key(id) {
-                    for scope in self.scopes.iter().rev().skip(1) {
-                        if matches!(scope.kind, ScopeKind::Function) || matches!(scope.kind, Module)
-                        {
-                            let used = scope
-                                .values
-                                .get(id)
-                                .map(|binding| binding.used)
-                                .unwrap_or_default();
-                            if let Some(scope_id) = used {
-                                if scope_id == current.id {
-                                    self.checks.push(Check {
-                                        kind: CheckKind::UndefinedLocal(id.clone()),
-                                        location: expr.location,
-                                    });
-                                }
+            let current = self.scopes.last().expect("No current scope found.");
+
+            if self.settings.select.contains(&CheckCode::F823)
+                && matches!(current.kind, ScopeKind::Function)
+                && !current.values.contains_key(id)
+            {
+                for scope in self.scopes.iter().rev().skip(1) {
+                    if matches!(scope.kind, ScopeKind::Function)
+                        || matches!(scope.kind, ScopeKind::Module)
+                    {
+                        let used = scope
+                            .values
+                            .get(id)
+                            .map(|binding| binding.used)
+                            .unwrap_or_default();
+                        if let Some(scope_id) = used {
+                            if scope_id == current.id {
+                                self.checks.push(Check::new(
+                                    CheckKind::UndefinedLocal(id.clone()),
+                                    expr.location,
+                                ));
                            }
                        }
                    }
@@ -611,14 +746,36 @@ impl Checker<'_> {
            }

            // TODO(charlie): Handle alternate binding types (like `Annotation`).
-            self.add_binding(
-                id.to_string(),
-                Binding {
-                    kind: BindingKind::Assignment,
-                    used: None,
-                    location: expr.location,
-                },
-            );
+            if id == "__all__"
+                && matches!(current.kind, ScopeKind::Module)
+                && match parent {
+                    None => false,
+                    Some(stmt) => {
+                        matches!(stmt.node, StmtKind::Assign { .. })
+                            || matches!(stmt.node, StmtKind::AugAssign { .. })
+                            || matches!(stmt.node, StmtKind::AnnAssign { .. })
+                    }
+                }
+            {
+                // Really need parent here.
+                self.add_binding(
+                    id.to_string(),
+                    Binding {
+                        kind: BindingKind::Export(extract_all_names(parent.unwrap(), current)),
+                        used: None,
+                        location: expr.location,
+                    },
+                );
+            } else {
+                self.add_binding(
+                    id.to_string(),
+                    Binding {
+                        kind: BindingKind::Assignment,
+                        used: None,
+                        location: expr.location,
+                    },
+                );
+            }
        }
    }

@@ -628,10 +785,10 @@ impl Checker<'_> {
            if current.values.remove(id).is_none()
                && self.settings.select.contains(&CheckCode::F821)
            {
-                self.checks.push(Check {
-                    kind: CheckKind::UndefinedName(id.clone()),
-                    location: expr.location,
-                })
+                self.checks.push(Check::new(
+                    CheckKind::UndefinedName(id.clone()),
+                    expr.location,
+                ))
            }
        }
    }
@@ -639,24 +796,57 @@ impl Checker<'_> {
    fn check_deferred(&mut self, path: &str) {
        for value in self.deferred.clone() {
            if let Ok(expr) = &parser::parse_expression(&value, path) {
-                self.visit_expr(expr);
+                self.visit_expr(expr, None);
            }
        }
    }

    fn check_dead_scopes(&mut self) {
-        if self.settings.select.contains(&CheckCode::F401) {
-            // TODO(charlie): Handle `__all__`.
-            for scope in &self.dead_scopes {
-                for (_, binding) in scope.values.iter().rev() {
-                    if binding.used.is_none() {
+        if !self.settings.select.contains(&CheckCode::F822)
+            && !self.settings.select.contains(&CheckCode::F401)
+        {
+            return;
+        }
+
+        for scope in &self.dead_scopes {
+            let all_binding = scope.values.get("__all__");
+            let all_names = all_binding.and_then(|binding| match &binding.kind {
+                BindingKind::Export(names) => Some(names),
+                _ => None,
+            });
+
+            if self.settings.select.contains(&CheckCode::F822)
+                && !Path::new(self.path).ends_with("__init__.py")
+            {
+                if let Some(binding) = all_binding {
+                    if let Some(names) = all_names {
+                        for name in names {
+                            if !scope.values.contains_key(name) {
+                                self.checks.push(Check::new(
+                                    CheckKind::UndefinedExport(name.to_string()),
+                                    binding.location,
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+
+            if self.settings.select.contains(&CheckCode::F401) {
+                for (name, binding) in scope.values.iter().rev() {
+                    let used = binding.used.is_some()
+                        || all_names
+                            .map(|names| names.contains(name))
+                            .unwrap_or_default();
+
+                    if !used {
                        match &binding.kind {
                            BindingKind::Importation(full_name)
                            | BindingKind::SubmoduleImportation(full_name) => {
-                                self.checks.push(Check {
-                                    kind: CheckKind::UnusedImport(full_name.to_string()),
-                                    location: binding.location,
-                                });
+                                self.checks.push(Check::new(
+                                    CheckKind::UnusedImport(full_name.to_string()),
+                                    binding.location,
+                                ));
                            }
                            _ => {}
                        }
@@ -667,9 +857,15 @@ impl Checker<'_> {
    }
 }

-pub fn check_ast(python_ast: &Suite, settings: &Settings, path: &str) -> Vec<Check> {
-    let mut checker = Checker::new(settings);
-    checker.push_scope(Scope::new(Module));
+pub fn check_ast(
+    python_ast: &Suite,
+    content: &str,
+    settings: &Settings,
+    autofix: &autofix::Mode,
+    path: &str,
+) -> Vec<Check> {
+    let mut checker = Checker::new(settings, autofix, path, content);
+    checker.push_scope(Scope::new(ScopeKind::Module));
    checker.bind_builtins();

    for stmt in python_ast {
--- a/src/check_lines.rs
+++ b/src/check_lines.rs
@@ -3,8 +3,24 @@ use rustpython_parser::ast::Location;
 use crate::checks::{Check, CheckKind};
 use crate::settings::Settings;

+/// Whether the given line is too long and should be reported.
+fn should_enforce_line_length(line: &str, limit: usize) -> bool {
+    if line.len() > limit {
+        let mut chunks = line.split_whitespace();
+        if let (Some(first), Some(_)) = (chunks.next(), chunks.next()) {
+            // Do not enforce the line length for commented lines with a single word
+            !(first == "#" && chunks.next().is_none())
+        } else {
+            // Single word / no printable chars - no way to make the line shorter
+            false
+        }
+    } else {
+        false
+    }
+}
+
 pub fn check_lines(checks: &mut Vec<Check>, contents: &str, settings: &Settings) {
-    let enforce_line_too_ling = settings.select.contains(CheckKind::LineTooLong.code());
+    let enforce_line_too_long = settings.select.contains(CheckKind::LineTooLong.code());

    let mut line_checks = vec![];
    let mut ignored = vec![];
@@ -18,16 +34,13 @@ pub fn check_lines(checks: &mut Vec<Check>, contents: &str, settings: &Settings)
        }

        // Enforce line length.
-        if enforce_line_too_ling && line.len() > settings.line_length {
-            let chunks: Vec<&str> = line.split_whitespace().collect();
-            if !(chunks.len() == 1 || (chunks.len() == 2 && chunks[0] == "#")) {
-                let check = Check {
-                    kind: CheckKind::LineTooLong,
-                    location: Location::new(row + 1, settings.line_length + 1),
-                };
-                if !check.is_inline_ignored(line) {
-                    line_checks.push(check);
-                }
+        if enforce_line_too_long && should_enforce_line_length(line, settings.line_length) {
+            let check = Check::new(
+                CheckKind::LineTooLong,
+                Location::new(row + 1, settings.line_length + 1),
+            );
+            if !check.is_inline_ignored(line) {
+                line_checks.push(check);
            }
        }
    }
--- a/src/checks.rs
+++ b/src/checks.rs
@@ -1,24 +1,31 @@
 use std::str::FromStr;

 use anyhow::Result;
+use once_cell::sync::Lazy;
 use regex::Regex;
 use rustpython_parser::ast::Location;
 use serde::{Deserialize, Serialize};

 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Hash, PartialOrd, Ord)]
 pub enum CheckCode {
+    E402,
    E501,
    F401,
    F403,
    F541,
+    F631,
    F634,
    F704,
    F706,
+    F707,
    F821,
+    F822,
+    F823,
    F831,
-    F832,
    F841,
    F901,
+    R001,
+    R002,
 }

 impl FromStr for CheckCode {
@@ -26,18 +33,24 @@ impl FromStr for CheckCode {

    fn from_str(s: &str) -> Result<Self> {
        match s {
+            "E402" => Ok(CheckCode::E402),
            "E501" => Ok(CheckCode::E501),
            "F401" => Ok(CheckCode::F401),
            "F403" => Ok(CheckCode::F403),
            "F541" => Ok(CheckCode::F541),
+            "F631" => Ok(CheckCode::F631),
            "F634" => Ok(CheckCode::F634),
            "F704" => Ok(CheckCode::F704),
            "F706" => Ok(CheckCode::F706),
+            "F707" => Ok(CheckCode::F707),
            "F821" => Ok(CheckCode::F821),
+            "F822" => Ok(CheckCode::F822),
+            "F823" => Ok(CheckCode::F823),
            "F831" => Ok(CheckCode::F831),
-            "F832" => Ok(CheckCode::F832),
            "F841" => Ok(CheckCode::F841),
            "F901" => Ok(CheckCode::F901),
+            "R001" => Ok(CheckCode::R001),
+            "R002" => Ok(CheckCode::R002),
            _ => Err(anyhow::anyhow!("Unknown check code: {s}")),
        }
    }
@@ -46,36 +59,48 @@ impl FromStr for CheckCode {
 impl CheckCode {
    pub fn as_str(&self) -> &str {
        match self {
+            CheckCode::E402 => "E402",
            CheckCode::E501 => "E501",
            CheckCode::F401 => "F401",
            CheckCode::F403 => "F403",
            CheckCode::F541 => "F541",
+            CheckCode::F631 => "F631",
            CheckCode::F634 => "F634",
            CheckCode::F704 => "F704",
            CheckCode::F706 => "F706",
+            CheckCode::F707 => "F707",
            CheckCode::F821 => "F821",
+            CheckCode::F822 => "F822",
+            CheckCode::F823 => "F823",
            CheckCode::F831 => "F831",
-            CheckCode::F832 => "F832",
            CheckCode::F841 => "F841",
            CheckCode::F901 => "F901",
+            CheckCode::R001 => "R001",
+            CheckCode::R002 => "R002",
        }
    }

    /// The source for the check (either the AST, or the physical lines).
    pub fn lint_source(&self) -> &'static LintSource {
        match self {
+            CheckCode::E402 => &LintSource::AST,
            CheckCode::E501 => &LintSource::Lines,
            CheckCode::F401 => &LintSource::AST,
            CheckCode::F403 => &LintSource::AST,
            CheckCode::F541 => &LintSource::AST,
+            CheckCode::F631 => &LintSource::AST,
            CheckCode::F634 => &LintSource::AST,
            CheckCode::F704 => &LintSource::AST,
            CheckCode::F706 => &LintSource::AST,
+            CheckCode::F707 => &LintSource::AST,
            CheckCode::F821 => &LintSource::AST,
+            CheckCode::F822 => &LintSource::AST,
+            CheckCode::F823 => &LintSource::AST,
            CheckCode::F831 => &LintSource::AST,
-            CheckCode::F832 => &LintSource::AST,
            CheckCode::F841 => &LintSource::AST,
            CheckCode::F901 => &LintSource::AST,
+            CheckCode::R001 => &LintSource::AST,
+            CheckCode::R002 => &LintSource::AST,
        }
    }
 }
@@ -88,42 +113,84 @@ pub enum LintSource {

 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub enum CheckKind {
+    AssertTuple,
+    DefaultExceptNotLast,
    DuplicateArgumentName,
    FStringMissingPlaceholders,
    IfTuple,
    ImportStarUsage,
    LineTooLong,
+    ModuleImportNotAtTopOfFile,
+    NoAssertEquals,
    RaiseNotImplemented,
-    YieldOutsideFunction,
    ReturnOutsideFunction,
-    UndefinedName(String),
+    UndefinedExport(String),
    UndefinedLocal(String),
-    UnusedVariable(String),
+    UndefinedName(String),
    UnusedImport(String),
+    UnusedVariable(String),
+    UselessObjectInheritance(String),
+    YieldOutsideFunction,
 }

 impl CheckKind {
+    /// The name of the check.
+    pub fn name(&self) -> &'static str {
+        match self {
+            CheckKind::AssertTuple => "AssertTuple",
+            CheckKind::DefaultExceptNotLast => "DefaultExceptNotLast",
+            CheckKind::DuplicateArgumentName => "DuplicateArgumentName",
+            CheckKind::FStringMissingPlaceholders => "FStringMissingPlaceholders",
+            CheckKind::IfTuple => "IfTuple",
+            CheckKind::ImportStarUsage => "ImportStarUsage",
+            CheckKind::LineTooLong => "LineTooLong",
+            CheckKind::ModuleImportNotAtTopOfFile => "ModuleImportNotAtTopOfFile",
+            CheckKind::NoAssertEquals => "NoAssertEquals",
+            CheckKind::RaiseNotImplemented => "RaiseNotImplemented",
+            CheckKind::ReturnOutsideFunction => "ReturnOutsideFunction",
+            CheckKind::UndefinedExport(_) => "UndefinedExport",
+            CheckKind::UndefinedLocal(_) => "UndefinedLocal",
+            CheckKind::UndefinedName(_) => "UndefinedName",
+            CheckKind::UnusedImport(_) => "UnusedImport",
+            CheckKind::UnusedVariable(_) => "UnusedVariable",
+            CheckKind::UselessObjectInheritance(_) => "UselessObjectInheritance",
+            CheckKind::YieldOutsideFunction => "YieldOutsideFunction",
+        }
+    }
+
    /// A four-letter shorthand code for the check.
    pub fn code(&self) -> &'static CheckCode {
        match self {
+            CheckKind::AssertTuple => &CheckCode::F631,
+            CheckKind::DefaultExceptNotLast => &CheckCode::F707,
            CheckKind::DuplicateArgumentName => &CheckCode::F831,
            CheckKind::FStringMissingPlaceholders => &CheckCode::F541,
            CheckKind::IfTuple => &CheckCode::F634,
            CheckKind::ImportStarUsage => &CheckCode::F403,
            CheckKind::LineTooLong => &CheckCode::E501,
+            CheckKind::ModuleImportNotAtTopOfFile => &CheckCode::E402,
+            CheckKind::NoAssertEquals => &CheckCode::R002,
            CheckKind::RaiseNotImplemented => &CheckCode::F901,
-            CheckKind::YieldOutsideFunction => &CheckCode::F704,
            CheckKind::ReturnOutsideFunction => &CheckCode::F706,
+            CheckKind::UndefinedExport(_) => &CheckCode::F822,
+            CheckKind::UndefinedLocal(_) => &CheckCode::F823,
            CheckKind::UndefinedName(_) => &CheckCode::F821,
-            CheckKind::UndefinedLocal(_) => &CheckCode::F832,
-            CheckKind::UnusedVariable(_) => &CheckCode::F841,
            CheckKind::UnusedImport(_) => &CheckCode::F401,
+            CheckKind::UnusedVariable(_) => &CheckCode::F841,
+            CheckKind::UselessObjectInheritance(_) => &CheckCode::R001,
+            CheckKind::YieldOutsideFunction => &CheckCode::F704,
        }
    }

    /// The body text for the check.
    pub fn body(&self) -> String {
        match self {
+            CheckKind::AssertTuple => {
+                "Assert test is a non-empty tuple, which is always `True`".to_string()
+            }
+            CheckKind::DefaultExceptNotLast => {
+                "an `except:` block as not the last exception handler".to_string()
+            }
            CheckKind::DuplicateArgumentName => {
                "Duplicate argument name in function definition".to_string()
            }
@@ -133,43 +200,103 @@ impl CheckKind {
            CheckKind::IfTuple => "If test is a tuple, which is always `True`".to_string(),
            CheckKind::ImportStarUsage => "Unable to detect undefined names".to_string(),
            CheckKind::LineTooLong => "Line too long".to_string(),
-            CheckKind::RaiseNotImplemented => {
-                "'raise NotImplemented' should be 'raise NotImplementedError".to_string()
+            CheckKind::ModuleImportNotAtTopOfFile => {
+                "Module level import not at top of file".to_string()
            }
-            CheckKind::YieldOutsideFunction => {
-                "a `yield` or `yield from` statement outside of a function/method".to_string()
+            CheckKind::NoAssertEquals => {
+                "`assertEquals` is deprecated, use `assertEqual` instead".to_string()
+            }
+            CheckKind::RaiseNotImplemented => {
+                "`raise NotImplemented` should be `raise NotImplementedError`".to_string()
            }
            CheckKind::ReturnOutsideFunction => {
                "a `return` statement outside of a function/method".to_string()
            }
+            CheckKind::UndefinedExport(name) => {
+                format!("Undefined name `{name}` in `__all__`")
+            }
            CheckKind::UndefinedName(name) => {
                format!("Undefined name `{name}`")
            }
-            CheckKind::UnusedVariable(name) => {
-                format!("Local variable `{name}` is assigned to but never used")
-            }
            CheckKind::UndefinedLocal(name) => {
                format!("Local variable `{name}` referenced before assignment")
            }
            CheckKind::UnusedImport(name) => format!("`{name}` imported but unused"),
+            CheckKind::UnusedVariable(name) => {
+                format!("Local variable `{name}` is assigned to but never used")
+            }
+            CheckKind::UselessObjectInheritance(name) => {
+                format!("Class `{name}` inherits from object")
+            }
+            CheckKind::YieldOutsideFunction => {
+                "a `yield` or `yield from` statement outside of a function/method".to_string()
+            }
+        }
+    }
+
+    /// Whether the check kind is (potentially) fixable.
+    pub fn fixable(&self) -> bool {
+        match self {
+            CheckKind::AssertTuple => false,
+            CheckKind::DefaultExceptNotLast => false,
+            CheckKind::DuplicateArgumentName => false,
+            CheckKind::FStringMissingPlaceholders => false,
+            CheckKind::IfTuple => false,
+            CheckKind::ImportStarUsage => false,
+            CheckKind::LineTooLong => false,
+            CheckKind::ModuleImportNotAtTopOfFile => false,
+            CheckKind::NoAssertEquals => true,
+            CheckKind::RaiseNotImplemented => false,
+            CheckKind::ReturnOutsideFunction => false,
+            CheckKind::UndefinedExport(_) => false,
+            CheckKind::UndefinedLocal(_) => false,
+            CheckKind::UndefinedName(_) => false,
+            CheckKind::UnusedImport(_) => false,
+            CheckKind::UnusedVariable(_) => false,
+            CheckKind::UselessObjectInheritance(_) => true,
+            CheckKind::YieldOutsideFunction => false,
        }
    }
 }

-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Fix {
+    pub content: String,
+    pub start: Location,
+    pub end: Location,
+    pub applied: bool,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Check {
    pub kind: CheckKind,
    pub location: Location,
+    pub fix: Option<Fix>,
 }

+static NO_QA_REGEX: Lazy<Regex> = Lazy::new(|| {
+    Regex::new(r"(?i)# noqa(?::\s?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?").expect("Invalid regex")
+});
+static SPLIT_COMMA_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").expect("Invalid regex"));
+
 impl Check {
+    pub fn new(kind: CheckKind, location: Location) -> Self {
+        Self {
+            kind,
+            location,
+            fix: None,
+        }
+    }
+
+    pub fn amend(&mut self, fix: Fix) {
+        self.fix = Some(fix);
+    }
+
    pub fn is_inline_ignored(&self, line: &str) -> bool {
-        let re = Regex::new(r"(?i)# noqa(?::\s?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?").unwrap();
-        match re.captures(line) {
+        match NO_QA_REGEX.captures(line) {
            Some(caps) => match caps.name("codes") {
                Some(codes) => {
-                    let re = Regex::new(r"[,\s]").unwrap();
-                    for code in re
+                    for code in SPLIT_COMMA_REGEX
                        .split(codes.as_str())
                        .map(|code| code.trim())
                        .filter(|code| !code.is_empty())
--- a/src/fixer.rs
+++ b/src/fixer.rs
@@ -0,0 +1,126 @@
+use crate::ast_ops::SourceCodeLocator;
+use rustpython_parser::ast::{Expr, Keyword, Location};
+use rustpython_parser::lexer;
+use rustpython_parser::token::Tok;
+
+use crate::checks::Fix;
+
+/// Convert a location within a file (relative to `base`) to an absolute position.
+fn to_absolute(relative: &Location, base: &Location) -> Location {
+    if relative.row() == 1 {
+        Location::new(
+            relative.row() + base.row() - 1,
+            relative.column() + base.column() - 1,
+        )
+    } else {
+        Location::new(relative.row() + base.row() - 1, relative.column())
+    }
+}
+
+/// Generate a fix to remove a base from a ClassDef statement.
+pub fn remove_class_def_base(
+    locator: &mut SourceCodeLocator,
+    stmt_at: &Location,
+    expr_at: Location,
+    bases: &[Expr],
+    keywords: &[Keyword],
+) -> Option<Fix> {
+    let content = locator.slice_source_code(stmt_at);
+
+    // Case 1: `object` is the only base.
+    if bases.len() == 1 && keywords.is_empty() {
+        let mut fix_start = None;
+        let mut fix_end = None;
+        let mut count: usize = 0;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            if matches!(tok, Tok::Lpar) {
+                if count == 0 {
+                    fix_start = Some(to_absolute(&start, stmt_at));
+                }
+                count += 1;
+            }
+
+            if matches!(tok, Tok::Rpar) {
+                count -= 1;
+                if count == 0 {
+                    fix_end = Some(to_absolute(&end, stmt_at));
+                    break;
+                }
+            }
+        }
+
+        return match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        };
+    }
+
+    if bases
+        .iter()
+        .map(|node| node.location)
+        .chain(keywords.iter().map(|node| node.location))
+        .any(|location| location > expr_at)
+    {
+        // Case 2: `object` is _not_ the last node.
+        let mut fix_start: Option<Location> = None;
+        let mut fix_end: Option<Location> = None;
+        let mut seen_comma = false;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            let start = to_absolute(&start, stmt_at);
+            if seen_comma {
+                if matches!(tok, Tok::Newline) {
+                    fix_end = Some(end);
+                } else {
+                    fix_end = Some(start);
+                }
+                break;
+            }
+            if start == expr_at {
+                fix_start = Some(start);
+            }
+            if fix_start.is_some() && matches!(tok, Tok::Comma) {
+                seen_comma = true;
+            }
+        }
+
+        match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        }
+    } else {
+        // Case 3: `object` is the last node, so we have to find the last token that isn't a comma.
+        let mut fix_start: Option<Location> = None;
+        let mut fix_end: Option<Location> = None;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            let start = to_absolute(&start, stmt_at);
+            let end = to_absolute(&end, stmt_at);
+            if start == expr_at {
+                fix_end = Some(end);
+                break;
+            }
+            if matches!(tok, Tok::Comma) {
+                fix_start = Some(start);
+            }
+        }
+
+        match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        }
+    }
+}
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,11 @@
+mod ast_ops;
+mod autofix;
 mod builtins;
 mod cache;
 pub mod check_ast;
 mod check_lines;
 pub mod checks;
+mod fixer;
 pub mod fs;
 pub mod linter;
 pub mod logging;
--- a/src/linter.rs
+++ b/src/linter.rs
@@ -4,20 +4,15 @@ use anyhow::Result;
 use log::debug;
 use rustpython_parser::parser;

+use crate::autofix::fix_file;
 use crate::check_ast::check_ast;
 use crate::check_lines::check_lines;
 use crate::checks::{Check, LintSource};
 use crate::message::Message;
 use crate::settings::Settings;
-use crate::{cache, fs};
-
-pub fn check_path(path: &Path, settings: &Settings, mode: &cache::Mode) -> Result<Vec<Message>> {
-    // Check the cache.
-    if let Some(messages) = cache::get(path, settings, mode) {
-        debug!("Cache hit for: {}", path.to_string_lossy());
-        return Ok(messages);
-    }
+use crate::{autofix, cache, fs};

+fn check_path(path: &Path, settings: &Settings, autofix: &autofix::Mode) -> Result<Vec<Check>> {
    // Read the file from disk.
    let contents = fs::read_file(path)?;

@@ -32,22 +27,51 @@ pub fn check_path(path: &Path, settings: &Settings, mode: &cache::Mode) -> Resul
    {
        let path = path.to_string_lossy();
        let python_ast = parser::parse_program(&contents, &path)?;
-        checks.extend(check_ast(&python_ast, settings, &path));
+        checks.extend(check_ast(&python_ast, &contents, settings, autofix, &path));
    }

    // Run the lines-based checks.
    check_lines(&mut checks, &contents, settings);

+    Ok(checks)
+}
+
+pub fn lint_path(
+    path: &Path,
+    settings: &Settings,
+    mode: &cache::Mode,
+    autofix: &autofix::Mode,
+) -> Result<Vec<Message>> {
+    let metadata = path.metadata()?;
+
+    // Check the cache.
+    if let Some(messages) = cache::get(path, &metadata, settings, autofix, mode) {
+        debug!("Cache hit for: {}", path.to_string_lossy());
+        return Ok(messages);
+    }
+
+    // Read the file from disk.
+    let contents = fs::read_file(path)?;
+
+    // Generate checks.
+    let mut checks = check_path(path, settings, autofix)?;
+
+    // Apply autofix.
+    if matches!(autofix, autofix::Mode::Apply) {
+        fix_file(&mut checks, &contents, path)?;
+    };
+
    // Convert to messages.
    let messages: Vec<Message> = checks
        .into_iter()
        .map(|check| Message {
            kind: check.kind,
+            fixed: check.fix.map(|fix| fix.applied).unwrap_or_default(),
            location: check.location,
            filename: path.to_string_lossy().to_string(),
        })
        .collect();
-    cache::set(path, settings, &messages, mode);
+    cache::set(path, &metadata, settings, autofix, &messages, mode);

    Ok(messages)
 }
@@ -60,26 +84,49 @@ mod tests {
    use anyhow::Result;
    use rustpython_parser::ast::Location;

-    use crate::checks::{CheckCode, CheckKind};
+    use crate::checks::{Check, CheckCode, CheckKind, Fix};
    use crate::linter::check_path;
-    use crate::message::Message;
-    use crate::{cache, settings};
+    use crate::{autofix, settings};
+
+    #[test]
+    fn e402() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/E402.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::E402]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![Check {
+            kind: CheckKind::ModuleImportNotAtTopOfFile,
+            location: Location::new(20, 1),
+            fix: None,
+        }];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }

    #[test]
    fn e501() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/E501.py"),
+            Path::new("./resources/test/fixtures/E501.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::E501]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
-        let expected = vec![Message {
+        let expected = vec![Check {
            kind: CheckKind::LineTooLong,
            location: Location::new(5, 89),
-            filename: "./resources/test/src/E501.py".to_string(),
+            fix: None,
        }];
        assert_eq!(actual.len(), expected.len());
        for i in 0..actual.len() {
@@ -92,29 +139,29 @@ mod tests {
    #[test]
    fn f401() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F401.py"),
+            Path::new("./resources/test/fixtures/F401.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F401]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::UnusedImport("logging.handlers".to_string()),
-                location: Location::new(11, 1),
-                filename: "./resources/test/src/F401.py".to_string(),
+                location: Location::new(12, 1),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::UnusedImport("functools".to_string()),
-                location: Location::new(2, 1),
-                filename: "./resources/test/src/F401.py".to_string(),
-            },
-            Message {
-                kind: CheckKind::UnusedImport("collections.OrderedDict".to_string()),
                location: Location::new(3, 1),
-                filename: "./resources/test/src/F401.py".to_string(),
+                fix: None,
+            },
+            Check {
+                kind: CheckKind::UnusedImport("collections.OrderedDict".to_string()),
+                location: Location::new(4, 1),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -128,24 +175,24 @@ mod tests {
    #[test]
    fn f403() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F403.py"),
+            Path::new("./resources/test/fixtures/F403.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F403]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::ImportStarUsage,
                location: Location::new(1, 1),
-                filename: "./resources/test/src/F403.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::ImportStarUsage,
                location: Location::new(2, 1),
-                filename: "./resources/test/src/F403.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -158,29 +205,60 @@ mod tests {
    #[test]
    fn f541() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F541.py"),
+            Path::new("./resources/test/fixtures/F541.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F541]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::FStringMissingPlaceholders,
                location: Location::new(4, 7),
-                filename: "./resources/test/src/F541.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::FStringMissingPlaceholders,
                location: Location::new(5, 7),
-                filename: "./resources/test/src/F541.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::FStringMissingPlaceholders,
                location: Location::new(7, 7),
-                filename: "./resources/test/src/F541.py".to_string(),
+                fix: None,
+            },
+        ];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn f631() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/F631.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::F631]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![
+            Check {
+                kind: CheckKind::AssertTuple,
+                location: Location::new(1, 1),
+                fix: None,
+            },
+            Check {
+                kind: CheckKind::AssertTuple,
+                location: Location::new(2, 1),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -194,24 +272,24 @@ mod tests {
    #[test]
    fn f634() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F634.py"),
+            Path::new("./resources/test/fixtures/F634.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F634]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::IfTuple,
                location: Location::new(1, 1),
-                filename: "./resources/test/src/F634.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::IfTuple,
                location: Location::new(7, 5),
-                filename: "./resources/test/src/F634.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -225,29 +303,29 @@ mod tests {
    #[test]
    fn f704() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F704.py"),
+            Path::new("./resources/test/fixtures/F704.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F704]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::YieldOutsideFunction,
                location: Location::new(6, 5),
-                filename: "./resources/test/src/F704.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::YieldOutsideFunction,
                location: Location::new(9, 1),
-                filename: "./resources/test/src/F704.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::YieldOutsideFunction,
                location: Location::new(10, 1),
-                filename: "./resources/test/src/F704.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -261,24 +339,60 @@ mod tests {
    #[test]
    fn f706() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F706.py"),
+            Path::new("./resources/test/fixtures/F706.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F706]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::ReturnOutsideFunction,
                location: Location::new(6, 5),
-                filename: "./resources/test/src/F706.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::ReturnOutsideFunction,
                location: Location::new(9, 1),
-                filename: "./resources/test/src/F706.py".to_string(),
+                fix: None,
+            },
+        ];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn f707() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/F707.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::F707]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![
+            Check {
+                kind: CheckKind::DefaultExceptNotLast,
+                location: Location::new(3, 1),
+                fix: None,
+            },
+            Check {
+                kind: CheckKind::DefaultExceptNotLast,
+                location: Location::new(10, 1),
+                fix: None,
+            },
+            Check {
+                kind: CheckKind::DefaultExceptNotLast,
+                location: Location::new(19, 1),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -292,34 +406,34 @@ mod tests {
    #[test]
    fn f821() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F821.py"),
+            Path::new("./resources/test/fixtures/F821.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F821]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::UndefinedName("self".to_string()),
                location: Location::new(2, 12),
-                filename: "./resources/test/src/F821.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::UndefinedName("self".to_string()),
                location: Location::new(6, 13),
-                filename: "./resources/test/src/F821.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::UndefinedName("self".to_string()),
                location: Location::new(10, 9),
-                filename: "./resources/test/src/F821.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::UndefinedName("numeric_string".to_string()),
                location: Location::new(21, 12),
-                filename: "./resources/test/src/F821.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -330,32 +444,80 @@ mod tests {
        Ok(())
    }

+    #[test]
+    fn f822() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/F822.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::F822]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![Check {
+            kind: CheckKind::UndefinedExport("b".to_string()),
+            location: Location::new(3, 1),
+            fix: None,
+        }];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn f823() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/F823.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::F823]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![Check {
+            kind: CheckKind::UndefinedLocal("my_var".to_string()),
+            location: Location::new(6, 5),
+            fix: None,
+        }];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
    #[test]
    fn f831() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F831.py"),
+            Path::new("./resources/test/fixtures/F831.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F831]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::DuplicateArgumentName,
                location: Location::new(1, 25),
-                filename: "./resources/test/src/F831.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::DuplicateArgumentName,
                location: Location::new(5, 28),
-                filename: "./resources/test/src/F831.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::DuplicateArgumentName,
                location: Location::new(9, 27),
-                filename: "./resources/test/src/F831.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -366,51 +528,27 @@ mod tests {
        Ok(())
    }

-    #[test]
-    fn f832() -> Result<()> {
-        let actual = check_path(
-            &Path::new("./resources/test/src/F832.py"),
-            &settings::Settings {
-                line_length: 88,
-                exclude: vec![],
-                select: BTreeSet::from([CheckCode::F832]),
-            },
-            &cache::Mode::None,
-        )?;
-        let expected = vec![Message {
-            kind: CheckKind::UndefinedLocal("my_var".to_string()),
-            location: Location::new(6, 5),
-            filename: "./resources/test/src/F832.py".to_string(),
-        }];
-        assert_eq!(actual.len(), expected.len());
-        for i in 0..actual.len() {
-            assert_eq!(actual[i], expected[i]);
-        }
-
-        Ok(())
-    }
-
    #[test]
    fn f841() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F841.py"),
+            Path::new("./resources/test/fixtures/F841.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F841]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::UnusedVariable("e".to_string()),
                location: Location::new(3, 1),
-                filename: "./resources/test/src/F841.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::UnusedVariable("z".to_string()),
                location: Location::new(16, 5),
-                filename: "./resources/test/src/F841.py".to_string(),
+                fix: None,
            },
        ];
        assert_eq!(actual.len(), expected.len());
@@ -424,24 +562,286 @@ mod tests {
    #[test]
    fn f901() -> Result<()> {
        let actual = check_path(
-            &Path::new("./resources/test/src/F901.py"),
+            Path::new("./resources/test/fixtures/F901.py"),
            &settings::Settings {
                line_length: 88,
                exclude: vec![],
                select: BTreeSet::from([CheckCode::F901]),
            },
-            &cache::Mode::None,
+            &autofix::Mode::Generate,
        )?;
        let expected = vec![
-            Message {
+            Check {
                kind: CheckKind::RaiseNotImplemented,
                location: Location::new(2, 5),
-                filename: "./resources/test/src/F901.py".to_string(),
+                fix: None,
            },
-            Message {
+            Check {
                kind: CheckKind::RaiseNotImplemented,
                location: Location::new(6, 5),
-                filename: "./resources/test/src/F901.py".to_string(),
+                fix: None,
+            },
+        ];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn r001() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/R001.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::R001]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(5, 9),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(5, 8),
+                    end: Location::new(5, 16),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(10, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(9, 8),
+                    end: Location::new(11, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(16, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(15, 8),
+                    end: Location::new(18, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(24, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(22, 8),
+                    end: Location::new(25, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(31, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(29, 8),
+                    end: Location::new(32, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(37, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(36, 8),
+                    end: Location::new(39, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(45, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(43, 8),
+                    end: Location::new(47, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(53, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(51, 8),
+                    end: Location::new(55, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(61, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(59, 8),
+                    end: Location::new(63, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(69, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(67, 8),
+                    end: Location::new(71, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(75, 12),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(75, 10),
+                    end: Location::new(75, 18),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(79, 9),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(79, 9),
+                    end: Location::new(79, 17),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(84, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(84, 5),
+                    end: Location::new(85, 5),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(92, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(91, 6),
+                    end: Location::new(92, 11),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(98, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(98, 5),
+                    end: Location::new(100, 5),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("B".to_string()),
+                location: Location::new(108, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(107, 6),
+                    end: Location::new(108, 11),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(114, 13),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(114, 12),
+                    end: Location::new(114, 20),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(119, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(118, 8),
+                    end: Location::new(120, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(125, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(124, 8),
+                    end: Location::new(126, 2),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::UselessObjectInheritance("A".to_string()),
+                location: Location::new(131, 5),
+                fix: Some(Fix {
+                    content: "".to_string(),
+                    start: Location::new(130, 8),
+                    end: Location::new(133, 2),
+                    applied: false,
+                }),
+            },
+        ];
+        assert_eq!(actual.len(), expected.len());
+        for i in 0..actual.len() {
+            assert_eq!(actual[i], expected[i]);
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn r002() -> Result<()> {
+        let actual = check_path(
+            Path::new("./resources/test/fixtures/R002.py"),
+            &settings::Settings {
+                line_length: 88,
+                exclude: vec![],
+                select: BTreeSet::from([CheckCode::R002]),
+            },
+            &autofix::Mode::Generate,
+        )?;
+        let expected = vec![
+            Check {
+                kind: CheckKind::NoAssertEquals,
+                location: Location::new(1, 19),
+                fix: Some(Fix {
+                    content: "assertEqual".to_string(),
+                    start: Location::new(1, 6),
+                    end: Location::new(1, 18),
+                    applied: false,
+                }),
+            },
+            Check {
+                kind: CheckKind::NoAssertEquals,
+                location: Location::new(2, 18),
+                fix: Some(Fix {
+                    content: "assertEqual".to_string(),
+                    start: Location::new(2, 6),
+                    end: Location::new(2, 18),
+                    applied: false,
+                }),
            },
        ];
        assert_eq!(actual.len(), expected.len());
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,14 +13,17 @@ use walkdir::DirEntry;

 use ::ruff::checks::CheckCode;
 use ::ruff::fs::iter_python_files;
-use ::ruff::linter::check_path;
+use ::ruff::linter::lint_path;
 use ::ruff::logging::set_up_logging;
 use ::ruff::message::Message;
 use ::ruff::settings::Settings;
 use ::ruff::tell_user;

+const CARGO_PKG_NAME: &str = env!("CARGO_PKG_NAME");
+const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
+
 #[derive(Debug, Parser)]
-#[clap(name = "ruff")]
+#[clap(name = format!("{CARGO_PKG_NAME} (v{CARGO_PKG_VERSION})"))]
 #[clap(about = "An extremely fast Python linter.", long_about = None)]
 struct Cli {
    #[clap(parse(from_os_str), value_hint = ValueHint::AnyPath, required = true)]
@@ -37,6 +40,9 @@ struct Cli {
    /// Run in watch mode by re-running whenever files change.
    #[clap(short, long, action)]
    watch: bool,
+    /// Attempt to automatically fix lint errors.
+    #[clap(short, long, action)]
+    fix: bool,
    /// Disable cache reads.
    #[clap(short, long, action)]
    no_cache: bool,
@@ -48,7 +54,12 @@ struct Cli {
    ignore: Vec<CheckCode>,
 }

-fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<Message>> {
+fn run_once(
+    files: &[PathBuf],
+    settings: &Settings,
+    cache: bool,
+    autofix: bool,
+) -> Result<Vec<Message>> {
    // Collect all the files to check.
    let start = Instant::now();
    let files: Vec<DirEntry> = files
@@ -62,7 +73,7 @@ fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<M
    let mut messages: Vec<Message> = files
        .par_iter()
        .map(|entry| {
-            check_path(entry.path(), settings, &cache.into()).unwrap_or_else(|e| {
+            lint_path(entry.path(), settings, &cache.into(), &autofix.into()).unwrap_or_else(|e| {
                error!("Failed to check {}: {e:?}", entry.path().to_string_lossy());
                vec![]
            })
@@ -77,13 +88,32 @@ fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<M
 }

 fn report_once(messages: &[Message]) -> Result<()> {
-    println!("Found {} error(s).", messages.len());
+    let (fixed, outstanding): (Vec<&Message>, Vec<&Message>) =
+        messages.iter().partition(|message| message.fixed);
+    let num_fixable = outstanding
+        .iter()
+        .filter(|message| message.kind.fixable())
+        .count();

-    if !messages.is_empty() {
-        println!();
-        for message in messages {
+    if !outstanding.is_empty() {
+        for message in &outstanding {
            println!("{}", message);
        }
+        println!();
+    }
+
+    if !fixed.is_empty() {
+        println!(
+            "Found {} error(s) ({} fixed).",
+            outstanding.len(),
+            fixed.len()
+        );
+    } else {
+        println!("Found {} error(s).", outstanding.len());
+    }
+
+    if num_fixable > 0 {
+        println!("{num_fixable} potentially fixable with the --fix option.");
    }

    Ok(())
@@ -121,11 +151,15 @@ fn inner_main() -> Result<ExitCode> {
    }

    if cli.watch {
+        if cli.fix {
+            println!("Warning: --fix is not enabled in watch mode.")
+        }
+
        // Perform an initial run instantly.
        clearscreen::clear()?;
        tell_user!("Starting linter in watch mode...\n");

-        let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+        let messages = run_once(&cli.files, &settings, !cli.no_cache, false)?;
        if !cli.quiet {
            report_continuously(&messages)?;
        }
@@ -145,7 +179,7 @@ fn inner_main() -> Result<ExitCode> {
                            clearscreen::clear()?;
                            tell_user!("File change detected...\n");

-                            let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+                            let messages = run_once(&cli.files, &settings, !cli.no_cache, false)?;
                            if !cli.quiet {
                                report_continuously(&messages)?;
                            }
@@ -156,11 +190,13 @@ fn inner_main() -> Result<ExitCode> {
            }
        }
    } else {
-        let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+        let messages = run_once(&cli.files, &settings, !cli.no_cache, cli.fix)?;
        if !cli.quiet {
            report_once(&messages)?;
        }

+        check_for_updates();
+
        if !messages.is_empty() && !cli.exit_zero {
            return Ok(ExitCode::FAILURE);
        }
@@ -169,6 +205,29 @@ fn inner_main() -> Result<ExitCode> {
    Ok(ExitCode::SUCCESS)
 }

+fn check_for_updates() {
+    use update_informer::{registry, Check};
+
+    let informer = update_informer::new(registry::PyPI, CARGO_PKG_NAME, CARGO_PKG_VERSION);
+
+    if let Some(new_version) = informer.check_version().ok().flatten() {
+        let msg = format!(
+            "A new version of {pkg_name} is available: v{pkg_version} -> {new_version}",
+            pkg_name = CARGO_PKG_NAME.italic().cyan(),
+            pkg_version = CARGO_PKG_VERSION,
+            new_version = new_version.to_string().green()
+        );
+
+        let cmd = format!(
+            "Run to update: {cmd} {pkg_name}",
+            cmd = "pip3 install --upgrade".green(),
+            pkg_name = CARGO_PKG_NAME.green()
+        );
+
+        println!("\n{msg}\n{cmd}");
+    }
+}
+
 fn main() -> ExitCode {
    match inner_main() {
        Ok(code) => code,
--- a/src/message.rs
+++ b/src/message.rs
@@ -7,25 +7,10 @@ use serde::{Deserialize, Serialize};

 use crate::checks::CheckKind;

-#[derive(Serialize, Deserialize)]
-#[serde(remote = "Location")]
-struct LocationDef {
-    #[serde(getter = "Location::row")]
-    row: usize,
-    #[serde(getter = "Location::column")]
-    column: usize,
-}
-
-impl From<LocationDef> for Location {
-    fn from(def: LocationDef) -> Location {
-        Location::new(def.row, def.column)
-    }
-}
-
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Message {
    pub kind: CheckKind,
-    #[serde(with = "LocationDef")]
+    pub fixed: bool,
    pub location: Location,
    pub filename: String,
 }
--- a/src/pyproject.rs
+++ b/src/pyproject.rs
@@ -216,18 +216,17 @@ other-attribute = 1

    #[test]
    fn find_and_parse_pyproject_toml() -> Result<()> {
-        let project_root = find_project_root([Path::new("resources/test/src/__init__.py")])
+        let project_root = find_project_root([Path::new("resources/test/fixtures/__init__.py")])
            .expect("Unable to find project root.");
-        assert_eq!(project_root, Path::new("resources/test/src"));
+        assert_eq!(project_root, Path::new("resources/test/fixtures"));

        let path = find_pyproject_toml(&project_root).expect("Unable to find pyproject.toml.");
-        assert_eq!(path, Path::new("resources/test/src/pyproject.toml"));
+        assert_eq!(path, Path::new("resources/test/fixtures/pyproject.toml"));

        let pyproject = parse_pyproject_toml(&path)?;
        let config = pyproject
            .tool
-            .map(|tool| tool.ruff)
-            .flatten()
+            .and_then(|tool| tool.ruff)
            .expect("Unable to find tool.ruff.");
        assert_eq!(
            config,
@@ -238,18 +237,24 @@ other-attribute = 1
                    Path::new("**/migrations").to_path_buf()
                ]),
                select: Some(BTreeSet::from([
+                    CheckCode::E402,
                    CheckCode::E501,
                    CheckCode::F401,
                    CheckCode::F403,
                    CheckCode::F541,
+                    CheckCode::F631,
                    CheckCode::F634,
                    CheckCode::F704,
                    CheckCode::F706,
+                    CheckCode::F707,
                    CheckCode::F821,
+                    CheckCode::F822,
+                    CheckCode::F823,
                    CheckCode::F831,
-                    CheckCode::F832,
                    CheckCode::F841,
                    CheckCode::F901,
+                    CheckCode::R001,
+                    CheckCode::R002,
                ])),
            }
        );
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -44,14 +44,17 @@ impl Settings {
                .collect(),
            select: config.select.unwrap_or_else(|| {
                BTreeSet::from([
+                    CheckCode::E402,
                    CheckCode::E501,
                    CheckCode::F401,
                    CheckCode::F403,
                    CheckCode::F541,
+                    CheckCode::F631,
                    CheckCode::F634,
                    CheckCode::F706,
+                    CheckCode::F707,
+                    CheckCode::F823,
                    CheckCode::F831,
-                    CheckCode::F832,
                    CheckCode::F901,
                ])
            }),
--- a/src/visitor.rs
+++ b/src/visitor.rs
@@ -11,7 +11,7 @@ pub trait Visitor {
    fn visit_annotation(&mut self, expr: &Expr) {
        walk_expr(self, expr);
    }
-    fn visit_expr(&mut self, expr: &Expr) {
+    fn visit_expr(&mut self, expr: &Expr, _parent: Option<&Stmt>) {
        walk_expr(self, expr);
    }
    fn visit_constant(&mut self, constant: &Constant) {
@@ -63,82 +63,43 @@ pub trait Visitor {

 pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
    match &stmt.node {
-        StmtKind::FunctionDef {
-            args,
-            body,
-            decorator_list,
-            returns,
-            ..
-        } => {
+        StmtKind::FunctionDef { args, body, .. } => {
            visitor.visit_arguments(args);
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
-            for expr in returns {
-                visitor.visit_annotation(expr);
-            }
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
        }
-        StmtKind::AsyncFunctionDef {
-            args,
-            body,
-            decorator_list,
-            returns,
-            ..
-        } => {
+        StmtKind::AsyncFunctionDef { args, body, .. } => {
            visitor.visit_arguments(args);
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
-            for expr in returns {
-                visitor.visit_annotation(expr);
-            }
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
        }
-        StmtKind::ClassDef {
-            bases,
-            keywords,
-            body,
-            decorator_list,
-            ..
-        } => {
-            for expr in bases {
-                visitor.visit_expr(expr)
-            }
-            for keyword in keywords {
-                visitor.visit_keyword(keyword)
-            }
+        StmtKind::ClassDef { body, .. } => {
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
        }
        StmtKind::Return { value } => {
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Delete { targets } => {
            for expr in targets {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Assign { targets, value, .. } => {
            for expr in targets {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
-            visitor.visit_expr(value)
+            visitor.visit_expr(value, Some(stmt))
        }
        StmtKind::AugAssign { target, op, value } => {
-            visitor.visit_expr(target);
+            visitor.visit_expr(target, Some(stmt));
            visitor.visit_operator(op);
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, Some(stmt));
        }
        StmtKind::AnnAssign {
            target,
@@ -146,10 +107,10 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            value,
            ..
        } => {
-            visitor.visit_expr(target);
+            visitor.visit_expr(target, Some(stmt));
            visitor.visit_annotation(annotation);
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::For {
@@ -159,8 +120,8 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            orelse,
            ..
        } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(iter);
+            visitor.visit_expr(target, Some(stmt));
+            visitor.visit_expr(iter, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -175,8 +136,8 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            orelse,
            ..
        } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(iter);
+            visitor.visit_expr(target, Some(stmt));
+            visitor.visit_expr(iter, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -185,7 +146,7 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::While { test, body, orelse } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -194,7 +155,7 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::If { test, body, orelse } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -220,17 +181,17 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
        }
        StmtKind::Match { subject, cases } => {
            // TODO(charlie): Handle `cases`.
-            visitor.visit_expr(subject);
+            visitor.visit_expr(subject, Some(stmt));
            for match_case in cases {
                visitor.visit_match_case(match_case);
            }
        }
        StmtKind::Raise { exc, cause } => {
            if let Some(expr) = exc {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            };
            if let Some(expr) = cause {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            };
        }
        StmtKind::Try {
@@ -253,9 +214,9 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::Assert { test, msg } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, None);
            if let Some(expr) = msg {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Import { names } => {
@@ -270,7 +231,7 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
        }
        StmtKind::Global { .. } => {}
        StmtKind::Nonlocal { .. } => {}
-        StmtKind::Expr { value } => visitor.visit_expr(value),
+        StmtKind::Expr { value } => visitor.visit_expr(value, Some(stmt)),
        StmtKind::Pass => {}
        StmtKind::Break => {}
        StmtKind::Continue => {}
@@ -282,55 +243,55 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
        ExprKind::BoolOp { op, values } => {
            visitor.visit_boolop(op);
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::NamedExpr { target, value } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(value);
+            visitor.visit_expr(target, None);
+            visitor.visit_expr(value, None);
        }
        ExprKind::BinOp { left, op, right } => {
-            visitor.visit_expr(left);
+            visitor.visit_expr(left, None);
            visitor.visit_operator(op);
-            visitor.visit_expr(right);
+            visitor.visit_expr(right, None);
        }
        ExprKind::UnaryOp { op, operand } => {
            visitor.visit_unaryop(op);
-            visitor.visit_expr(operand);
+            visitor.visit_expr(operand, None);
        }
        ExprKind::Lambda { args, body } => {
            visitor.visit_arguments(args);
-            visitor.visit_expr(body);
+            visitor.visit_expr(body, None);
        }
        ExprKind::IfExp { test, body, orelse } => {
-            visitor.visit_expr(test);
-            visitor.visit_expr(body);
-            visitor.visit_expr(orelse);
+            visitor.visit_expr(test, None);
+            visitor.visit_expr(body, None);
+            visitor.visit_expr(orelse, None);
        }
        ExprKind::Dict { keys, values } => {
            for expr in keys {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Set { elts } => {
            for expr in elts {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::ListComp { elt, generators } => {
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
-            visitor.visit_expr(elt);
+            visitor.visit_expr(elt, None);
        }
        ExprKind::SetComp { elt, generators } => {
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
-            visitor.visit_expr(elt);
+            visitor.visit_expr(elt, None);
        }
        ExprKind::DictComp {
            key,
@@ -340,33 +301,33 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
-            visitor.visit_expr(key);
-            visitor.visit_expr(value);
+            visitor.visit_expr(key, None);
+            visitor.visit_expr(value, None);
        }
        ExprKind::GeneratorExp { elt, generators } => {
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
-            visitor.visit_expr(elt);
+            visitor.visit_expr(elt, None);
        }
-        ExprKind::Await { value } => visitor.visit_expr(value),
+        ExprKind::Await { value } => visitor.visit_expr(value, None),
        ExprKind::Yield { value } => {
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
-        ExprKind::YieldFrom { value } => visitor.visit_expr(value),
+        ExprKind::YieldFrom { value } => visitor.visit_expr(value, None),
        ExprKind::Compare {
            left,
            ops,
            comparators,
        } => {
-            visitor.visit_expr(left);
+            visitor.visit_expr(left, None);
            for cmpop in ops {
                visitor.visit_cmpop(cmpop);
            }
            for expr in comparators {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Call {
@@ -374,9 +335,9 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
            args,
            keywords,
        } => {
-            visitor.visit_expr(func);
+            visitor.visit_expr(func, None);
            for expr in args {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            for keyword in keywords {
                visitor.visit_keyword(keyword);
@@ -385,28 +346,28 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
        ExprKind::FormattedValue {
            value, format_spec, ..
        } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            if let Some(expr) = format_spec {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::JoinedStr { values } => {
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Constant { value, .. } => visitor.visit_constant(value),
        ExprKind::Attribute { value, ctx, .. } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Subscript { value, slice, ctx } => {
-            visitor.visit_expr(value);
-            visitor.visit_expr(slice);
+            visitor.visit_expr(value, None);
+            visitor.visit_expr(slice, None);
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Starred { value, ctx } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Name { ctx, .. } => {
@@ -414,25 +375,25 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
        }
        ExprKind::List { elts, ctx } => {
            for expr in elts {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Tuple { elts, ctx } => {
            for expr in elts {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Slice { lower, upper, step } => {
            if let Some(expr) = lower {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            if let Some(expr) = upper {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            if let Some(expr) = step {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
        }
    }
@@ -447,10 +408,10 @@ pub fn walk_constant<V: Visitor + ?Sized>(visitor: &mut V, constant: &Constant)
 }

 pub fn walk_comprehension<V: Visitor + ?Sized>(visitor: &mut V, comprehension: &Comprehension) {
-    visitor.visit_expr(&comprehension.target);
-    visitor.visit_expr(&comprehension.iter);
+    visitor.visit_expr(&comprehension.target, None);
+    visitor.visit_expr(&comprehension.iter, None);
    for expr in &comprehension.ifs {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
 }

@@ -458,7 +419,7 @@ pub fn walk_excepthandler<V: Visitor + ?Sized>(visitor: &mut V, excepthandler: &
    match &excepthandler.node {
        ExcepthandlerKind::ExceptHandler { type_, body, .. } => {
            if let Some(expr) = type_ {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            for stmt in body {
                visitor.visit_stmt(stmt);
@@ -481,13 +442,13 @@ pub fn walk_arguments<V: Visitor + ?Sized>(visitor: &mut V, arguments: &Argument
        visitor.visit_arg(arg);
    }
    for expr in &arguments.kw_defaults {
-        visitor.visit_expr(expr)
+        visitor.visit_expr(expr, None)
    }
    if let Some(arg) = &arguments.kwarg {
        visitor.visit_arg(arg)
    }
    for expr in &arguments.defaults {
-        visitor.visit_expr(expr)
+        visitor.visit_expr(expr, None)
    }
 }

@@ -498,20 +459,20 @@ pub fn walk_arg<V: Visitor + ?Sized>(visitor: &mut V, arg: &Arg) {
 }

 pub fn walk_keyword<V: Visitor + ?Sized>(visitor: &mut V, keyword: &Keyword) {
-    visitor.visit_expr(&keyword.node.value);
+    visitor.visit_expr(&keyword.node.value, None);
 }

 pub fn walk_withitem<V: Visitor + ?Sized>(visitor: &mut V, withitem: &Withitem) {
-    visitor.visit_expr(&withitem.context_expr);
+    visitor.visit_expr(&withitem.context_expr, None);
    if let Some(expr) = &withitem.optional_vars {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
 }

 pub fn walk_match_case<V: Visitor + ?Sized>(visitor: &mut V, match_case: &MatchCase) {
    visitor.visit_pattern(&match_case.pattern);
    if let Some(expr) = &match_case.guard {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
    for stmt in &match_case.body {
        visitor.visit_stmt(stmt);
@@ -520,7 +481,7 @@ pub fn walk_match_case<V: Visitor + ?Sized>(visitor: &mut V, match_case: &MatchC

 pub fn walk_pattern<V: Visitor + ?Sized>(visitor: &mut V, pattern: &Pattern) {
    match &pattern.node {
-        PatternKind::MatchValue { value } => visitor.visit_expr(value),
+        PatternKind::MatchValue { value } => visitor.visit_expr(value, None),
        PatternKind::MatchSingleton { value } => visitor.visit_constant(value),
        PatternKind::MatchSequence { patterns } => {
            for pattern in patterns {
@@ -529,7 +490,7 @@ pub fn walk_pattern<V: Visitor + ?Sized>(visitor: &mut V, pattern: &Pattern) {
        }
        PatternKind::MatchMapping { keys, patterns, .. } => {
            for expr in keys {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            for pattern in patterns {
                visitor.visit_pattern(pattern);
@@ -541,7 +502,7 @@ pub fn walk_pattern<V: Visitor + ?Sized>(visitor: &mut V, pattern: &Pattern) {
            kwd_patterns,
            ..
        } => {
-            visitor.visit_expr(cls);
+            visitor.visit_expr(cls, None);
            for pattern in patterns {
                visitor.visit_pattern(pattern);
            }
Author	SHA1	Message	Date
Charlie Marsh	45db571935	Bump version to 0.0.26	2022-09-05 12:28:27 -04:00
Charlie Marsh	198e5cf27f	Implement R002 (NoAssertEquals) (#98 )	2022-09-05 12:27:47 -04:00
Charlie Marsh	79b6472c7c	Add a note RE Black compat	2022-09-05 12:27:39 -04:00
Charlie Marsh	f902d25dc7	Implement ESLint-style fix for R0205 (#97 )	2022-09-05 12:16:06 -04:00
Charlie Marsh	826bdfeb63	Add utility scripts for AST printing (#105 )	2022-09-05 09:31:55 -04:00
Charlie Marsh	a3fb0d6c20	Remove custom serialization for Location (#104 )	2022-09-04 17:54:45 -04:00
Charlie Marsh	3cf9e3b201	Implement E402 (ModuleImportNotAtTopOfFile) (#102 )	2022-09-04 16:20:36 -04:00
Charlie Marsh	533b4e752b	Reduce ignores in CPython benchmark	2022-09-04 16:13:35 -04:00
Charlie Marsh	cf45d520e6	Fix failing test	2022-09-04 12:02:21 -04:00
Harutaka Kawamura	b86414dc7a	Implement F707 (DefaultExceptNotLast) (#101 )	2022-09-04 11:55:06 -04:00
Charlie Marsh	8f6ab8b37a	Fix formatting of some rule messages	2022-09-04 09:52:31 -04:00
Harutaka Kawamura	312bfd8d2b	Implement F631 (AssertTuple) (#99 )	2022-09-04 08:39:49 -04:00
Harutaka Kawamura	e2f46537fd	Fix false positive for `IfTuple` (#96 )	2022-09-03 22:56:55 -04:00
Charlie Marsh	97cc30768d	Fix typo in enforce_line_too_long	2022-09-03 16:32:15 -04:00
Grachev Mikhail	d580f2eb90	Check for updates (#90 )	2022-09-03 16:31:44 -04:00
Dmitry Dygalo	507fecfd9a	perf: Avoid `Vec<&str>` allocation during line length checking (#95 )	2022-09-03 16:27:18 -04:00
Charlie Marsh	4319bd1755	Bump version to 0.0.25	2022-09-03 12:09:11 -04:00
Charlie Marsh	6bb6cb1783	Implement F822 (#94 )	2022-09-03 12:08:26 -04:00
Charlie Marsh	e9412c9452	Generate a list of supported lint rules (#93 )	2022-09-03 11:56:11 -04:00
Charlie Marsh	94faa7f301	Rename resources/test/src to resources/test/fixtures (#92 )	2022-09-03 11:49:03 -04:00
Charlie Marsh	5041f6530c	Implement R0205 (#91 )	2022-09-03 11:33:54 -04:00
Narawit Rakket	3c7716ef27	refactor: run `cargo clippy --fix` (#88 )	2022-09-02 17:01:24 -04:00
Charlie Marsh	26e1f4b6df	Bump version to 0.0.24	2022-09-02 10:18:40 -04:00
Charlie Marsh	17c08523dc	Remove rogue println	2022-09-02 10:18:12 -04:00
Charlie Marsh	221f4304ad	Add support for __all__ export bindings (#87 )	2022-09-02 10:17:31 -04:00
Charlie Marsh	c0131e65e5	Avoid putting decorators in the function scope (#86 )	2022-09-02 09:13:06 -04:00
Charlie Marsh	bf4722a62f	Fix future-to-__future__ typo (#85 )	2022-09-02 08:56:26 -04:00
Charlie Marsh	994f5d452c	Update .gitignore	2022-09-01 20:32:32 -04:00
Nikita Sobolev	741857cdf9	Use the latest version of `actions/checkout` (#79 )	2022-09-01 13:18:31 -04:00
Ariel Richtman	4f42f51bd2	Add pre-commit hook (#55 )	2022-09-01 13:01:28 -04:00
Dmitry Dygalo	5a3092e805	perf: Compile `Regex` once (#77 )	2022-09-01 12:49:29 -04:00
Charlie Marsh	0318406535	Re-sort lint rules	2022-09-01 12:39:25 -04:00
Sekky61	0c99b5aac5	Fix F832 --> F823 typo (#73 )	2022-09-01 12:37:34 -04:00
Kian-Meng Ang	b442402b13	Prettify md/yaml files (#74 )	2022-09-01 12:36:47 -04:00