Bump version to 0.0.173

Detect unused arguments

.github/workflows/ruff.yaml

@@ -1,9 +1,8 @@
 name: "[ruff] Release"
 
 on:
-  create:
-    tags:
-      - v*
+  release:
+    types: [published]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.167
+    rev: v0.0.173
     hooks:
       - id: ruff
 

Cargo.lock

@@ -724,7 +724,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8-to-ruff"
-version = "0.0.167-dev.0"
+version = "0.0.173-dev.0"
 dependencies = [
  "anyhow",
  "clap 4.0.29",
@@ -1821,7 +1821,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.167"
+version = "0.0.173"
 dependencies = [
  "annotate-snippets 0.9.1",
  "anyhow",
@@ -1874,7 +1874,7 @@ dependencies = [
 
 [[package]]
 name = "ruff_dev"
-version = "0.0.167"
+version = "0.0.173"
 dependencies = [
  "anyhow",
  "clap 4.0.29",
@@ -1892,7 +1892,7 @@ dependencies = [
 
 [[package]]
 name = "ruff_macros"
-version = "0.0.161"
+version = "0.0.173"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -6,7 +6,7 @@ members = [
 
 [package]
 name = "ruff"
-version = "0.0.167"
+version = "0.0.173"
 edition = "2021"
 rust-version = "1.65.0"
 
@@ -41,7 +41,7 @@ quick-junit = { version = "0.3.2" }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
 ropey = { version = "1.5.0", features = ["cr_lines", "simd"], default-features = false }
-ruff_macros = { version = "0.0.161", path = "ruff_macros" }
+ruff_macros = { version = "0.0.173", path = "ruff_macros" }
 rustc-hash = { version = "1.1.0" }
 rustpython-ast = { features = ["unparse"], git = "https://github.com/RustPython/RustPython.git", rev = "28f9f65ccc625f00835d84bbb5fba274dce5aa89" }
 rustpython-common = { git = "https://github.com/RustPython/RustPython.git", rev = "28f9f65ccc625f00835d84bbb5fba274dce5aa89" }

LICENSE

@@ -388,6 +388,56 @@ are:
     SOFTWARE.
   """
 
+- flake8-import-conventions, licensed as follows:
+  """
+    MIT License
+
+    Copyright (c) 2021 João Palmeiro
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+  """
+
+- flake8-unused-arguments, licensed as follows:
+  """
+    MIT License
+
+    Copyright (c) 2019 Nathan Hoad
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+  """
+
 - isort, licensed as follows:
   """
     The MIT License (MIT)

README.md

@@ -72,7 +72,7 @@ of [Conda](https://docs.conda.io/en/latest/):
    1. [Pyflakes (F)](#pyflakes-f)
    1. [pycodestyle (E, W)](#pycodestyle-e-w)
    1. [mccabe (C90)](#mccabe-c90)
-   1. [isort (I00)](#isort-i00)
+   1. [isort (I)](#isort-i)
    1. [pydocstyle (D)](#pydocstyle-d)
    1. [pyupgrade (UP)](#pyupgrade-up)
    1. [pep8-naming (N)](#pep8-naming-n)
@@ -89,7 +89,8 @@ of [Conda](https://docs.conda.io/en/latest/):
    1. [flake8-print (T20)](#flake8-print-t20)
    1. [flake8-quotes (Q)](#flake8-quotes-q)
    1. [flake8-return (RET)](#flake8-return-ret)
-   1. [flake8-tidy-imports (I25)](#flake8-tidy-imports-i25)
+   1. [flake8-tidy-imports (TID)](#flake8-tidy-imports-tid)
+   1. [flake8-unused-arguments (ARG)](#flake8-unused-arguments-arg)
    1. [eradicate (ERA)](#eradicate-era)
    1. [pygrep-hooks (PGH)](#pygrep-hooks-pgh)
    1. [Pylint (PLC, PLE, PLR, PLW)](#pylint-plc-ple-plr-plw)
@@ -146,7 +147,7 @@ Ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.167
+    rev: v0.0.173
     hooks:
       - id: ruff
 ```
@@ -437,11 +438,13 @@ For more, see [Pyflakes](https://pypi.org/project/pyflakes/2.5.0/) on PyPI.
 | F706 | ReturnOutsideFunction | `return` statement outside of a function/method |  |
 | F707 | DefaultExceptNotLast | An `except` block as not the last exception handler |  |
 | F722 | ForwardAnnotationSyntaxError | Syntax error in forward annotation: `...` |  |
+| F811 | RedefinedWhileUnused | Redefinition of unused `...` from line 1 |  |
 | 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 |  |
+| F842 | UnusedAnnotation | Local variable `...` is annotated but never used |  |
 | F901 | RaiseNotImplemented | `raise NotImplemented` should be `raise NotImplementedError` | 🛠 |
 
 ### pycodestyle (E, W)
@@ -475,7 +478,7 @@ For more, see [mccabe](https://pypi.org/project/mccabe/0.7.0/) on PyPI.
 | ---- | ---- | ------- | --- |
 | C901 | FunctionIsTooComplex | `...` is too complex (10) |  |
 
-### isort (I00)
+### isort (I)
 
 For more, see [isort](https://pypi.org/project/isort/5.10.1/) on PyPI.
 
@@ -514,6 +517,7 @@ For more, see [pydocstyle](https://pypi.org/project/pydocstyle/6.1.1/) on PyPI.
 | D214 | SectionNotOverIndented | Section is over-indented ("Returns") | 🛠 |
 | D215 | SectionUnderlineNotOverIndented | Section underline is over-indented ("Returns") | 🛠 |
 | D300 | UsesTripleQuotes | Use """triple double quotes""" |  |
+| D301 | UsesRPrefixForBackslashedContent | Use r""" if any backslashes in a docstring |  |
 | D400 | EndsInPeriod | First line should end with a period | 🛠 |
 | D402 | NoSignature | First line should not be the function's signature |  |
 | D403 | FirstLineCapitalized | First word of the first line should be properly capitalized |  |
@@ -760,13 +764,25 @@ For more, see [flake8-return](https://pypi.org/project/flake8-return/1.2.0/) on
 | RET507 | SuperfluousElseContinue | Unnecessary `else` after `continue` statement |  |
 | RET508 | SuperfluousElseBreak | Unnecessary `else` after `break` statement |  |
 
-### flake8-tidy-imports (I25)
+### flake8-tidy-imports (TID)
 
 For more, see [flake8-tidy-imports](https://pypi.org/project/flake8-tidy-imports/4.8.0/) on PyPI.
 
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
-| I252 | BannedRelativeImport | Relative imports are banned |  |
+| TID252 | BannedRelativeImport | Relative imports are banned |  |
+
+### flake8-unused-arguments (ARG)
+
+For more, see [flake8-unused-arguments](https://pypi.org/project/flake8-unused-arguments/0.0.12/) on PyPI.
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| ARG001 | UnusedFunctionArgument | Unused function argument: `...` |  |
+| ARG002 | UnusedMethodArgument | Unused method argument: `...` |  |
+| ARG003 | UnusedClassMethodArgument | Unused class method argument: `...` |  |
+| ARG004 | UnusedStaticMethodArgument | Unused static method argument: `...` |  |
+| ARG005 | UnusedLambdaArgument | Unused lambda argument: `...` |  |
 
 ### eradicate (ERA)
 
@@ -795,9 +811,9 @@ For more, see [Pylint](https://pypi.org/project/pylint/2.15.7/) on PyPI.
 | PLC3002 | UnnecessaryDirectLambdaCall | Lambda expression called directly. Execute the expression inline instead. |  |
 | PLE1142 | AwaitOutsideAsync | `await` should be used within an async function |  |
 | PLR0206 | PropertyWithParameters | Cannot have defined parameters for properties |  |
-| PLR0402 | ConsiderUsingFromImport | Consider using `from ... import ...` |  |
-| PLR1701 | ConsiderMergingIsinstance | Consider merging these isinstance calls: `isinstance(..., (...))` |  |
-| PLR1722 | ConsiderUsingSysExit | Consider using `sys.exit()` | 🛠 |
+| PLR0402 | ConsiderUsingFromImport | Use `from ... import ...` in lieu of alias |  |
+| PLR1701 | ConsiderMergingIsinstance | Merge these isinstance calls: `isinstance(..., (...))` |  |
+| PLR1722 | UseSysExit | Use `sys.exit()` instead of `exit` | 🛠 |
 | PLW0120 | UselessElseOnLoop | Else clause on loop without a break statement, remove the else and de-indent all the code inside it |  |
 
 ### Ruff-specific rules (RUF)
@@ -935,7 +951,7 @@ automatically convert your existing configuration.)
 Ruff can be used as a drop-in replacement for Flake8 when used (1) without or with a small number of
 plugins, (2) alongside Black, and (3) on Python 3 code.
 
-Under those conditions, Ruff implements every rule in Flake8, with the exception of `F811`.
+Under those conditions, Ruff implements every rule in Flake8.
 
 Ruff also re-implements some of the most popular Flake8 plugins and related code quality tools
 natively, including:
@@ -967,6 +983,12 @@ natively, including:
 - [`pygrep-hooks`](https://github.com/pre-commit/pygrep-hooks) (1/10)
 - [`autoflake`](https://pypi.org/project/autoflake/) (1/7)
 
+Note that, in some cases, Ruff uses different error code prefixes than would be found in the
+originating Flake8 plugins. For example, Ruff uses `TID252` to represent the `I252` rule from
+`flake8-tidy-imports`. This helps minimize conflicts across plugins and allows any individual plugin
+to be toggled on or off with a single (e.g.) `--select TID`, as opposed to `--select I2` (to avoid
+conflicts with the `isort` rules, like `I001`).
+
 Beyond the rule set, Ruff suffers from the following limitations vis-à-vis Flake8:
 
 1. Ruff does not yet support a few Python 3.9 and 3.10 language features, including structural
@@ -1465,7 +1487,7 @@ fix = true
 
 A list of check code prefixes to consider autofix-able.
 
-**Default value**: `["A", "ANN", "B", "BLE", "C", "D", "E", "F", "FBT", "I", "M", "N", "Q", "RUF", "S", "T", "U", "W", "YTT"]`
+**Default value**: `["A", "ANN", "ARG", "B", "BLE", "C", "D", "E", "ERA", "F", "FBT", "I", "ICN", "N", "PGH", "PLC", "PLE", "PLR", "PLW", "Q", "RET", "RUF", "S", "T", "TID", "UP", "W", "YTT"]`
 
 **Type**: `Vec<CheckCodePrefix>`
 
@@ -1782,7 +1804,7 @@ The conventional aliases for imports. These aliases can be extended by the `exte
 
 **Default value**: `{"altair": "alt", "matplotlib.pyplot": "plt", "numpy": "np", "pandas": "pd", "seaborn": "sns"}`
 
-**Type**: `BTreeMap<String, String>`
+**Type**: `FxHashMap<String, String>`
 
 **Example usage**:
 
@@ -1804,7 +1826,7 @@ A mapping of modules to their conventional import aliases. These aliases will be
 
 **Default value**: `{}`
 
-**Type**: `BTreeMap<String, String>`
+**Type**: `FxHashMap<String, String>`
 
 **Example usage**:
 
@@ -1961,6 +1983,10 @@ from .utils import (
 )
 ```
 
+Note that this setting is only effective when combined with `combine-as-imports = true`.
+When `combine-as-imports` isn't enabled, every aliased `import from` will be given its
+own line, in which case, wrapping is not necessary.
+
 **Default value**: `false`
 
 **Type**: `bool`
@@ -1970,6 +1996,7 @@ from .utils import (
 ```toml
 [tool.ruff.isort]
 force-wrap-aliases = true
+combine-as-imports = true
 ```
 
 ---

flake8_to_ruff/Cargo.lock

@@ -771,7 +771,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8_to_ruff"
-version = "0.0.167"
+version = "0.0.173"
 dependencies = [
  "anyhow",
  "clap",
@@ -1975,7 +1975,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.167"
+version = "0.0.173"
 dependencies = [
  "anyhow",
  "bincode",

flake8_to_ruff/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "flake8-to-ruff"
-version = "0.0.167-dev.0"
+version = "0.0.173-dev.0"
 edition = "2021"
 
 [lib]

flake8_to_ruff/src/converter.rs

@@ -512,6 +512,7 @@ mod tests {
                 CheckCodePrefix::D214,
                 CheckCodePrefix::D215,
                 CheckCodePrefix::D300,
+                CheckCodePrefix::D301,
                 CheckCodePrefix::D400,
                 CheckCodePrefix::D403,
                 CheckCodePrefix::D404,

flake8_to_ruff/src/parser.rs

@@ -135,7 +135,6 @@ fn tokenize_files_to_codes_mapping(value: &str) -> Vec<Token> {
 }
 
 /// Parse a 'files-to-codes' mapping, mimicking Flake8's internal logic.
-///
 /// See: <https://github.com/PyCQA/flake8/blob/7dfe99616fc2f07c0017df2ba5fa884158f3ea8a/src/flake8/utils.py#L45>
 pub fn parse_files_to_codes_mapping(value: &str) -> Result<Vec<PatternPrefixPair>> {
     if value.trim().is_empty() {

flake8_to_ruff/src/plugin.rs

@@ -162,6 +162,7 @@ impl DocstringConvention {
                 // CheckCodePrefix::D214,
                 // CheckCodePrefix::D215,
                 CheckCodePrefix::D300,
+                CheckCodePrefix::D301,
                 CheckCodePrefix::D400,
                 CheckCodePrefix::D402,
                 CheckCodePrefix::D403,
@@ -209,6 +210,7 @@ impl DocstringConvention {
                 CheckCodePrefix::D214,
                 CheckCodePrefix::D215,
                 CheckCodePrefix::D300,
+                CheckCodePrefix::D301,
                 CheckCodePrefix::D400,
                 // CheckCodePrefix::D402,
                 CheckCodePrefix::D403,
@@ -257,6 +259,7 @@ impl DocstringConvention {
                 CheckCodePrefix::D214,
                 // CheckCodePrefix::D215,
                 CheckCodePrefix::D300,
+                CheckCodePrefix::D301,
                 // CheckCodePrefix::D400,
                 CheckCodePrefix::D402,
                 CheckCodePrefix::D403,

resources/test/fixtures/eradicate/ERA001.py

@@ -5,9 +5,11 @@ a = 4
 #foo(1, 2, 3)
 
 def foo(x, y, z):
-    contentet = 1 # print('hello')
+    content = 1 # print('hello')
     print(x, y, z)
 
     # This is a real comment.
     #return True
     return False
+
+#import os  # noqa: ERA001

resources/test/fixtures/flake8_return/RET504.py

@@ -130,6 +130,12 @@ def x():
     return val
 
 
+def x():
+    a = 1
+    print(f"a={a}")
+    return a
+
+
 # Test cases for using value for assignment then returning it
 # See:https://github.com/afonasev/flake8-return/issues/47
 def resolve_from_url(self, url: str) -> dict:

resources/test/fixtures/flake8_unused_arguments/ARG.py

@@ -0,0 +1,137 @@
+from abc import abstractmethod
+from typing_extensions import override
+
+
+###
+# Unused arguments on functions.
+###
+def f(self, x):
+    print("Hello, world!")
+
+
+def f(cls, x):
+    print("Hello, world!")
+
+
+def f(self, x):
+    ...
+
+
+def f(cls, x):
+    ...
+
+
+###
+# Unused arguments on lambdas.
+###
+lambda x: print("Hello, world!")
+
+
+class X:
+    ###
+    # Unused arguments.
+    ###
+    def f(self, x):
+        print("Hello, world!")
+
+    def f(self, /, x):
+        print("Hello, world!")
+
+    def f(cls, x):
+        print("Hello, world!")
+
+    @classmethod
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    def f(x):
+        print("Hello, world!")
+
+    ###
+    # Unused arguments attached to empty functions (OK).
+    ###
+    def f(self, x):
+        ...
+
+    def f(self, /, x):
+        ...
+
+    def f(cls, x):
+        ...
+
+    @classmethod
+    def f(cls, x):
+        ...
+
+    @staticmethod
+    def f(cls, x):
+        ...
+
+    @staticmethod
+    def f(x):
+        ...
+
+    ###
+    # Unused functions attached to abstract methods (OK).
+    ###
+    @abstractmethod
+    def f(self, x):
+        print("Hello, world!")
+
+    @abstractmethod
+    def f(self, /, x):
+        print("Hello, world!")
+
+    @abstractmethod
+    def f(cls, x):
+        print("Hello, world!")
+
+    @classmethod
+    @abstractmethod
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    @abstractmethod
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    @abstractmethod
+    def f(x):
+        print("Hello, world!")
+
+    ###
+    # Unused functions attached to overrides (OK).
+    ###
+    @override
+    def f(self, x):
+        print("Hello, world!")
+
+    @override
+    def f(self, /, x):
+        print("Hello, world!")
+
+    @override
+    def f(cls, x):
+        print("Hello, world!")
+
+    @classmethod
+    @override
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    @override
+    def f(cls, x):
+        print("Hello, world!")
+
+    @staticmethod
+    @override
+    def f(x):
+        print("Hello, world!")

resources/test/fixtures/isort/insert_empty_lines.pyi

@@ -0,0 +1,41 @@
+import a
+import b
+x = 1
+import os
+import sys
+def f():
+    pass
+if True:
+    x = 1
+    import collections
+    import typing
+class X: pass
+y = 1
+import os
+import sys
+"""Docstring"""
+
+if True:
+    import os
+
+
+def f():
+    pass
+
+
+if True:
+    import os
+def f():
+    pass
+
+if True:
+    x = 1
+    import collections
+    import typing
+    class X: pass
+
+if True:
+    x = 1
+    import collections
+    import typing
+    def f(): pass

resources/test/fixtures/pyflakes/F811_0.py

@@ -0,0 +1,11 @@
+def foo(x):
+    return x
+
+
+@foo
+def bar():
+    pass
+
+
+def bar():
+    pass

resources/test/fixtures/pyflakes/F811_1.py

@@ -0,0 +1 @@
+import fu as FU, bar as FU

resources/test/fixtures/pyflakes/F811_10.py

@@ -0,0 +1,8 @@
+"""Test that importing a module twice using a nested does not issue a warning."""
+try:
+    if True:
+        if True:
+            import os
+except:
+    import os
+os.path

resources/test/fixtures/pyflakes/F811_11.py

@@ -0,0 +1,9 @@
+try:
+    from aa import mixer
+except AttributeError:
+    from bb import mixer
+except RuntimeError:
+    from cc import mixer
+except:
+    from dd import mixer
+mixer(123)

resources/test/fixtures/pyflakes/F811_12.py

@@ -0,0 +1,7 @@
+try:
+    from aa import mixer
+except ImportError:
+    pass
+else:
+    from bb import mixer
+mixer(123)

resources/test/fixtures/pyflakes/F811_13.py

@@ -0,0 +1,8 @@
+try:
+    import funca
+except ImportError:
+    from bb import funca
+    from bb import funcb
+else:
+    from bbb import funcb
+print(funca, funcb)

resources/test/fixtures/pyflakes/F811_14.py

@@ -0,0 +1,10 @@
+try:
+    import b
+except ImportError:
+    b = Ellipsis
+    from bb import a
+else:
+    from aa import a
+finally:
+    a = 42
+print(a, b)

resources/test/fixtures/pyflakes/F811_15.py

@@ -0,0 +1,5 @@
+import fu
+
+
+def fu():
+    pass

resources/test/fixtures/pyflakes/F811_16.py

@@ -0,0 +1,9 @@
+"""Test that shadowing a global with a nested function generates a warning."""
+
+import fu
+
+
+def bar():
+    def baz():
+        def fu():
+            pass

resources/test/fixtures/pyflakes/F811_17.py

@@ -0,0 +1,10 @@
+"""Test that shadowing a global name with a nested function generates a warning."""
+import fu
+
+
+def bar():
+    import fu
+
+    def baz():
+        def fu():
+            pass

resources/test/fixtures/pyflakes/F811_18.py

@@ -0,0 +1,14 @@
+"""Test that a global import which is redefined locally, but used later in another scope does not generate a warning."""
+
+import unittest, transport
+
+
+class GetTransportTestCase(unittest.TestCase):
+    def test_get_transport(self):
+        transport = 'transport'
+        self.assertIsNotNone(transport)
+
+
+class TestTransportMethodArgs(unittest.TestCase):
+    def test_send_defaults(self):
+        transport.Transport()

resources/test/fixtures/pyflakes/F811_19.py

@@ -0,0 +1,7 @@
+"""If an imported name is redefined by a class statement which also uses that name in the bases list, no warning is emitted."""
+
+from fu import bar
+
+
+class bar(bar):
+    pass

resources/test/fixtures/pyflakes/F811_2.py

@@ -0,0 +1 @@
+from moo import fu as FU, bar as FU

resources/test/fixtures/pyflakes/F811_20.py

@@ -0,0 +1,14 @@
+"""
+ Test that shadowing a global with a class attribute does not produce a
+ warning.
+ """
+
+import fu
+
+
+class bar:
+    # STOPSHIP: This errors.
+    fu = 1
+
+
+print(fu)

resources/test/fixtures/pyflakes/F811_3.py

@@ -0,0 +1 @@
+import fu; fu = 3

resources/test/fixtures/pyflakes/F811_4.py

@@ -0,0 +1 @@
+import fu; fu, bar = 3

resources/test/fixtures/pyflakes/F811_5.py

@@ -0,0 +1 @@
+import fu; [fu, bar] = 3

resources/test/fixtures/pyflakes/F811_6.py

@@ -0,0 +1,7 @@
+"""Test that importing a module twice within an if block does raise a warning."""
+
+i = 2
+if i == 1:
+    import os
+    import os
+os.path

resources/test/fixtures/pyflakes/F811_7.py

@@ -0,0 +1,8 @@
+"""Test that importing a module twice in if-else blocks does not raise a warning."""
+
+i = 2
+if i == 1:
+    import os
+else:
+    import os
+os.path

resources/test/fixtures/pyflakes/F811_8.py

@@ -0,0 +1,8 @@
+"""Test that importing a module twice in a try block does raise a warning."""
+
+try:
+    import os
+    import os
+except:
+    pass
+os.path

resources/test/fixtures/pyflakes/F811_9.py

@@ -0,0 +1,7 @@
+"""Test that importing a module twice in a try block does not raise a warning."""
+
+try:
+    import os
+except:
+    import os
+os.path

resources/test/fixtures/pyflakes/F842.py

@@ -0,0 +1,13 @@
+def f():
+    name: str
+    age: int
+
+
+class A:
+    name: str
+    age: int
+
+
+class B:
+    name: str = "Bob"
+    age: int = 18

resources/test/fixtures/pylint/useless_else_on_loop.py

@@ -75,7 +75,7 @@ def test_break_in_orelse_deep():
 
 
 def test_break_in_orelse_deep2():
-    """should rise a useless-else-on-loop message, as the break statement is only
+    """should raise a useless-else-on-loop message, as the break statement is only
     for the inner for loop
     """
     for _ in range(10):
@@ -101,3 +101,15 @@ def test_break_in_orelse_deep3():
     else:
         return True
     return False
+
+
+def test_break_in_if_orelse():
+    """should raise a useless-else-on-loop message due to break in else"""
+    for _ in range(10):
+        if 1 < 2:  # pylint: disable=comparison-of-constants
+            pass
+        else:
+            break
+    else:
+        return True
+    return False

ruff_dev/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff_dev"
-version = "0.0.167"
+version = "0.0.173"
 edition = "2021"
 
 [dependencies]

ruff_dev/src/generate_check_code_prefix.rs

@@ -8,7 +8,7 @@ use anyhow::Result;
 use clap::Parser;
 use codegen::{Scope, Type, Variant};
 use itertools::Itertools;
-use ruff::checks::{CheckCode, REDIRECTS};
+use ruff::checks::{CheckCode, CODE_REDIRECTS, PREFIX_REDIRECTS};
 use strum::IntoEnumIterator;
 
 const FILE: &str = "src/checks_gen.rs";
@@ -39,34 +39,26 @@ pub fn main(cli: &Cli) -> Result<()> {
         }
     }
 
-    // Add any aliases (e.g., "U001" to "UP001").
-    for (alias, check_code) in REDIRECTS.iter() {
-        // Compute the length of the prefix and suffix for both codes.
-        let code_str: String = check_code.as_ref().to_string();
-        let code_prefix_len = code_str
-            .chars()
-            .take_while(|char| char.is_alphabetic())
-            .count();
-        let code_suffix_len = code_str.len() - code_prefix_len;
-        let alias_prefix_len = alias
-            .chars()
-            .take_while(|char| char.is_alphabetic())
-            .count();
-        let alias_suffix_len = alias.len() - alias_prefix_len;
-        assert_eq!(code_suffix_len, alias_suffix_len);
-        for i in 0..=code_suffix_len {
-            let source = code_str[..code_prefix_len + i].to_string();
-            let destination = alias[..alias_prefix_len + i].to_string();
-            if source != destination {
-                prefix_to_codes.insert(
-                    destination,
-                    prefix_to_codes
-                        .get(&source)
-                        .unwrap_or_else(|| panic!("Unknown CheckCode: {source:?}"))
-                        .clone(),
-                );
-            }
-        }
+    // Add any prefix aliases (e.g., "U" to "UP").
+    for (alias, source) in PREFIX_REDIRECTS.iter() {
+        prefix_to_codes.insert(
+            (*alias).to_string(),
+            prefix_to_codes
+                .get(&(*source).to_string())
+                .unwrap_or_else(|| panic!("Unknown CheckCode: {source:?}"))
+                .clone(),
+        );
+    }
+
+    // Add any check code aliases (e.g., "U001" to "UP001").
+    for (alias, check_code) in CODE_REDIRECTS.iter() {
+        prefix_to_codes.insert(
+            (*alias).to_string(),
+            prefix_to_codes
+                .get(&check_code.as_ref().to_string())
+                .unwrap_or_else(|| panic!("Unknown CheckCode: {alias:?}"))
+                .clone(),
+        );
     }
 
     let mut scope = Scope::new();
@@ -113,10 +105,10 @@ pub fn main(cli: &Cli) -> Result<()> {
         .line("#[allow(clippy::match_same_arms)]")
         .line("match self {");
     for (prefix, codes) in &prefix_to_codes {
-        if let Some(target) = REDIRECTS.get(&prefix.as_str()) {
+        if let Some(target) = CODE_REDIRECTS.get(&prefix.as_str()) {
             gen = gen.line(format!(
                 "CheckCodePrefix::{prefix} => {{ eprintln!(\"{{}}{{}} {{}}\", \
-                 \"warning\".yellow().bold(), \":\".bold(), \"`{}` has been renamed to \
+                 \"warning\".yellow().bold(), \":\".bold(), \"`{}` has been remapped to \
                  `{}`\".bold()); \n vec![{}] }}",
                 prefix,
                 target.as_ref(),
@@ -125,6 +117,18 @@ pub fn main(cli: &Cli) -> Result<()> {
                     .map(|code| format!("CheckCode::{}", code.as_ref()))
                     .join(", ")
             ));
+        } else if let Some(target) = PREFIX_REDIRECTS.get(&prefix.as_str()) {
+            gen = gen.line(format!(
+                "CheckCodePrefix::{prefix} => {{ eprintln!(\"{{}}{{}} {{}}\", \
+                 \"warning\".yellow().bold(), \":\".bold(), \"`{}` has been remapped to \
+                 `{}`\".bold()); \n vec![{}] }}",
+                prefix,
+                target,
+                codes
+                    .iter()
+                    .map(|code| format!("CheckCode::{}", code.as_ref()))
+                    .join(", ")
+            ));
         } else {
             gen = gen.line(format!(
                 "CheckCodePrefix::{prefix} => vec![{}],",
@@ -187,7 +191,9 @@ pub fn main(cli: &Cli) -> Result<()> {
     output.push_str("pub const CATEGORIES: &[CheckCodePrefix] = &[");
     output.push('\n');
     for prefix in prefix_to_codes.keys() {
-        if prefix.chars().all(char::is_alphabetic) {
+        if prefix.chars().all(char::is_alphabetic)
+            && !PREFIX_REDIRECTS.contains_key(&prefix.as_str())
+        {
             output.push_str(&format!("CheckCodePrefix::{prefix},"));
             output.push('\n');
         }

ruff_macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff_macros"
-version = "0.0.161"
+version = "0.0.173"
 edition = "2021"
 
 [lib]

src/ast/branch_detection.rs

@@ -0,0 +1,105 @@
+use std::cmp::Ordering;
+
+use rustc_hash::FxHashMap;
+use rustpython_ast::ExcepthandlerKind::ExceptHandler;
+use rustpython_ast::Stmt;
+use rustpython_parser::ast::StmtKind;
+
+use crate::ast::types::RefEquality;
+
+/// Return the common ancestor of `left` and `right` below `stop`, or `None`.
+fn common_ancestor<'a>(
+    left: &'a RefEquality<'a, Stmt>,
+    right: &'a RefEquality<'a, Stmt>,
+    stop: Option<&'a RefEquality<'a, Stmt>>,
+    depths: &'a FxHashMap<RefEquality<'a, Stmt>, usize>,
+    child_to_parent: &'a FxHashMap<RefEquality<'a, Stmt>, RefEquality<'a, Stmt>>,
+) -> Option<&'a RefEquality<'a, Stmt>> {
+    if let Some(stop) = stop {
+        if left == stop || right == stop {
+            return None;
+        }
+    }
+    if left == right {
+        return Some(left);
+    }
+
+    let left_depth = depths.get(left)?;
+    let right_depth = depths.get(right)?;
+    match left_depth.cmp(right_depth) {
+        Ordering::Less => common_ancestor(
+            left,
+            child_to_parent.get(right)?,
+            stop,
+            depths,
+            child_to_parent,
+        ),
+        Ordering::Equal => common_ancestor(
+            child_to_parent.get(left)?,
+            child_to_parent.get(right)?,
+            stop,
+            depths,
+            child_to_parent,
+        ),
+        Ordering::Greater => common_ancestor(
+            child_to_parent.get(left)?,
+            right,
+            stop,
+            depths,
+            child_to_parent,
+        ),
+    }
+}
+
+/// Return the alternative branches for a given node.
+fn alternatives<'a>(node: &'a RefEquality<'a, Stmt>) -> Vec<Vec<RefEquality<'a, Stmt>>> {
+    match &node.0.node {
+        StmtKind::If { body, .. } => vec![body.iter().map(RefEquality).collect()],
+        StmtKind::Try {
+            body,
+            handlers,
+            orelse,
+            ..
+        } => vec![body.iter().chain(orelse.iter()).map(RefEquality).collect()]
+            .into_iter()
+            .chain(handlers.iter().map(|handler| {
+                let ExceptHandler { body, .. } = &handler.node;
+                body.iter().map(RefEquality).collect()
+            }))
+            .collect(),
+        _ => vec![],
+    }
+}
+
+/// Return `true` if `node` is a descendent of any of the nodes in `ancestors`.
+fn descendant_of<'a>(
+    node: &RefEquality<'a, Stmt>,
+    ancestors: &[RefEquality<'a, Stmt>],
+    stop: &RefEquality<'a, Stmt>,
+    depths: &FxHashMap<RefEquality<'a, Stmt>, usize>,
+    child_to_parent: &FxHashMap<RefEquality<'a, Stmt>, RefEquality<'a, Stmt>>,
+) -> bool {
+    ancestors.iter().any(|ancestor| {
+        common_ancestor(node, ancestor, Some(stop), depths, child_to_parent).is_some()
+    })
+}
+
+/// Return `true` if `left` and `right` are on different branches of an `if` or
+/// `try` statement.
+pub fn different_forks<'a>(
+    left: &RefEquality<'a, Stmt>,
+    right: &RefEquality<'a, Stmt>,
+    depths: &FxHashMap<RefEquality<'a, Stmt>, usize>,
+    child_to_parent: &FxHashMap<RefEquality<'a, Stmt>, RefEquality<'a, Stmt>>,
+) -> bool {
+    if let Some(ancestor) = common_ancestor(left, right, None, depths, child_to_parent) {
+        for items in alternatives(ancestor) {
+            let l = descendant_of(left, &items, ancestor, depths, child_to_parent);
+            let r = descendant_of(right, &items, ancestor, depths, child_to_parent);
+            if l ^ r {
+                return true;
+            }
+        }
+    }
+    false
+}

src/ast/cast.rs

@@ -0,0 +1,9 @@
+use rustpython_ast::{Expr, Stmt, StmtKind};
+
+pub fn decorator_list(stmt: &Stmt) -> &Vec<Expr> {
+    match &stmt.node {
+        StmtKind::FunctionDef { decorator_list, .. }
+        | StmtKind::AsyncFunctionDef { decorator_list, .. } => decorator_list,
+        _ => panic!("Expected StmtKind::FunctionDef | StmtKind::AsyncFunctionDef"),
+    }
+}

src/ast/function_type.rs

@@ -0,0 +1,65 @@
+use rustc_hash::{FxHashMap, FxHashSet};
+use rustpython_ast::Expr;
+
+use crate::ast::helpers::{
+    collect_call_paths, dealias_call_path, match_call_path, to_module_and_member,
+};
+use crate::ast::types::{Scope, ScopeKind};
+
+const CLASS_METHODS: [&str; 3] = ["__new__", "__init_subclass__", "__class_getitem__"];
+const METACLASS_BASES: [(&str, &str); 2] = [("", "type"), ("abc", "ABCMeta")];
+
+pub enum FunctionType {
+    Function,
+    Method,
+    ClassMethod,
+    StaticMethod,
+}
+
+/// Classify a function based on its scope, name, and decorators.
+pub fn classify(
+    scope: &Scope,
+    name: &str,
+    decorator_list: &[Expr],
+    from_imports: &FxHashMap<&str, FxHashSet<&str>>,
+    import_aliases: &FxHashMap<&str, &str>,
+    classmethod_decorators: &[String],
+    staticmethod_decorators: &[String],
+) -> FunctionType {
+    let ScopeKind::Class(scope) = &scope.kind else {
+        return FunctionType::Function;
+    };
+    // Special-case class method, like `__new__`.
+    if CLASS_METHODS.contains(&name)
+        || scope.bases.iter().any(|expr| {
+            // The class itself extends a known metaclass, so all methods are class methods.
+            let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
+            METACLASS_BASES
+                .iter()
+                .any(|(module, member)| match_call_path(&call_path, module, member, from_imports))
+        })
+        || decorator_list.iter().any(|expr| {
+            // The method is decorated with a class method decorator (like `@classmethod`).
+            let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
+            classmethod_decorators.iter().any(|decorator| {
+                let (module, member) = to_module_and_member(decorator);
+                match_call_path(&call_path, module, member, from_imports)
+            })
+        })
+    {
+        FunctionType::ClassMethod
+    } else if decorator_list.iter().any(|expr| {
+        // The method is decorated with a static method decorator (like
+        // `@staticmethod`).
+        let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
+        staticmethod_decorators.iter().any(|decorator| {
+            let (module, member) = to_module_and_member(decorator);
+            match_call_path(&call_path, module, member, from_imports)
+        })
+    }) {
+        FunctionType::StaticMethod
+    } else {
+        // It's an instance method.
+        FunctionType::Method
+    }
+}

src/ast/mod.rs

@@ -1,3 +1,6 @@
+pub mod branch_detection;
+pub mod cast;
+pub mod function_type;
 pub mod helpers;
 pub mod operations;
 pub mod relocate;

src/ast/operations.rs

@@ -3,10 +3,10 @@ use rustpython_parser::ast::{Constant, Expr, ExprKind, Stmt, StmtKind};
 use rustpython_parser::lexer;
 use rustpython_parser::lexer::Tok;
 
-use crate::ast::types::{BindingKind, Scope};
+use crate::ast::types::{Binding, BindingKind, Scope};
 
 /// Extract the names bound to a given __all__ assignment.
-pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
+pub fn extract_all_names(stmt: &Stmt, scope: &Scope, bindings: &[Binding]) -> Vec<String> {
     fn add_to_names(names: &mut Vec<String>, elts: &[Expr]) {
         for elt in elts {
             if let ExprKind::Constant {
@@ -23,8 +23,8 @@ pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<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 {
+        if let Some(index) = scope.values.get("__all__") {
+            if let BindingKind::Export(existing) = &bindings[*index].kind {
                 names.extend_from_slice(existing);
             }
         }

src/ast/types.rs

@@ -1,7 +1,7 @@
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 use rustc_hash::FxHashMap;
-use rustpython_ast::{Expr, Keyword, Stmt};
+use rustpython_ast::{Arguments, Expr, Keyword, Stmt};
 use rustpython_parser::ast::{Located, Location};
 
 fn id() -> usize {
@@ -30,36 +30,54 @@ impl Range {
     }
 }
 
-#[derive(Clone, Debug)]
-pub struct FunctionScope {
+#[derive(Debug)]
+pub struct FunctionDef<'a> {
+    pub name: &'a str,
+    pub args: &'a Arguments,
+    pub body: &'a [Stmt],
+    pub decorator_list: &'a [Expr],
+    // pub returns: Option<&'a Expr>,
+    // pub type_comment: Option<&'a str>,
+    // TODO(charlie): Create AsyncFunctionDef to mirror the AST.
     pub async_: bool,
-    pub uses_locals: bool,
 }
 
-#[derive(Clone, Debug)]
-pub struct ClassScope<'a> {
+#[derive(Debug)]
+pub struct ClassDef<'a> {
     pub name: &'a str,
     pub bases: &'a [Expr],
     pub keywords: &'a [Keyword],
+    // pub body: &'a [Stmt],
     pub decorator_list: &'a [Expr],
 }
 
-#[derive(Clone, Debug)]
+#[derive(Debug)]
+pub struct Lambda<'a> {
+    pub args: &'a Arguments,
+    pub body: &'a Expr,
+}
+
+#[derive(Debug)]
 pub enum ScopeKind<'a> {
-    Class(ClassScope<'a>),
-    Function(FunctionScope),
+    Class(ClassDef<'a>),
+    Function(FunctionDef<'a>),
     Generator,
     Module,
     Arg,
-    Lambda,
+    Lambda(Lambda<'a>),
 }
 
-#[derive(Clone, Debug)]
+#[derive(Debug)]
 pub struct Scope<'a> {
     pub id: usize,
     pub kind: ScopeKind<'a>,
     pub import_starred: bool,
-    pub values: FxHashMap<&'a str, Binding>,
+    pub uses_locals: bool,
+    /// A map from bound name to binding index.
+    pub values: FxHashMap<&'a str, usize>,
+    /// A list of (name, index) pairs for bindings that were overridden in the
+    /// scope.
+    pub overridden: Vec<(&'a str, usize)>,
 }
 
 impl<'a> Scope<'a> {
@@ -68,43 +86,122 @@ impl<'a> Scope<'a> {
             id: id(),
             kind,
             import_starred: false,
+            uses_locals: false,
             values: FxHashMap::default(),
+            overridden: Vec::new(),
         }
     }
 }
 
-#[derive(Clone, Debug)]
-pub struct BindingContext {
-    pub defined_by: usize,
-    pub defined_in: Option<usize>,
-}
-
 #[derive(Clone, Debug)]
 pub enum BindingKind {
     Annotation,
     Argument,
     Assignment,
-    // TODO(charlie): This seems to be a catch-all.
     Binding,
     LoopVar,
     Global,
     Nonlocal,
     Builtin,
     ClassDefinition,
-    Definition,
+    FunctionDefinition,
     Export(Vec<String>),
     FutureImportation,
     StarImportation(Option<usize>, Option<String>),
-    Importation(String, String, BindingContext),
-    FromImportation(String, String, BindingContext),
-    SubmoduleImportation(String, String, BindingContext),
+    Importation(String, String),
+    FromImportation(String, String),
+    SubmoduleImportation(String, String),
 }
 
 #[derive(Clone, Debug)]
-pub struct Binding {
+pub struct Binding<'a> {
     pub kind: BindingKind,
     pub range: Range,
+    /// The statement in which the `Binding` was defined.
+    pub source: Option<RefEquality<'a, Stmt>>,
     /// Tuple of (scope index, range) indicating the scope and range at which
     /// the binding was last used.
     pub used: Option<(usize, Range)>,
 }
+
+// Pyflakes defines the following binding hierarchy (via inheritance):
+//   Binding
+//    ExportBinding
+//    Annotation
+//    Argument
+//    Assignment
+//      NamedExprAssignment
+//    Definition
+//      FunctionDefinition
+//      ClassDefinition
+//      Builtin
+//      Importation
+//        SubmoduleImportation
+//        ImportationFrom
+//        StarImportation
+//        FutureImportation
+
+impl<'a> Binding<'a> {
+    pub fn is_definition(&self) -> bool {
+        matches!(
+            self.kind,
+            BindingKind::ClassDefinition
+                | BindingKind::FunctionDefinition
+                | BindingKind::Builtin
+                | BindingKind::FutureImportation
+                | BindingKind::StarImportation(..)
+                | BindingKind::Importation(..)
+                | BindingKind::FromImportation(..)
+                | BindingKind::SubmoduleImportation(..)
+        )
+    }
+
+    pub fn redefines(&self, existing: &'a Binding) -> bool {
+        match &self.kind {
+            BindingKind::Importation(_, full_name) | BindingKind::FromImportation(_, full_name) => {
+                if let BindingKind::SubmoduleImportation(_, existing_full_name) = &existing.kind {
+                    return full_name == existing_full_name;
+                }
+            }
+            BindingKind::SubmoduleImportation(_, full_name) => {
+                if let BindingKind::Importation(_, existing_full_name)
+                | BindingKind::FromImportation(_, existing_full_name)
+                | BindingKind::SubmoduleImportation(_, existing_full_name) = &existing.kind
+                {
+                    return full_name == existing_full_name;
+                }
+            }
+            BindingKind::Annotation => {
+                return false;
+            }
+            BindingKind::FutureImportation => {
+                return false;
+            }
+            BindingKind::StarImportation(..) => {
+                return false;
+            }
+            _ => {}
+        }
+        existing.is_definition()
+    }
+}
+
+#[derive(Debug, Copy, Clone)]
+pub struct RefEquality<'a, T>(pub &'a T);
+
+impl<'a, T> std::hash::Hash for RefEquality<'a, T> {
+    fn hash<H>(&self, state: &mut H)
+    where
+        H: std::hash::Hasher,
+    {
+        (self.0 as *const T).hash(state);
+    }
+}
+
+impl<'a, 'b, T> PartialEq<RefEquality<'b, T>> for RefEquality<'a, T> {
+    fn eq(&self, other: &RefEquality<'b, T>) -> bool {
+        std::ptr::eq(self.0, other.0)
+    }
+}
+
+impl<'a, T> Eq for RefEquality<'a, T> {}

src/ast/visitor.rs

@@ -159,8 +159,8 @@ pub fn walk_stmt<'a, V: Visitor<'a> + ?Sized>(visitor: &mut V, stmt: &'a Stmt) {
             orelse,
             ..
         } => {
-            visitor.visit_expr(target);
             visitor.visit_expr(iter);
+            visitor.visit_expr(target);
             for stmt in body {
                 visitor.visit_stmt(stmt);
             }
@@ -175,8 +175,8 @@ pub fn walk_stmt<'a, V: Visitor<'a> + ?Sized>(visitor: &mut V, stmt: &'a Stmt) {
             orelse,
             ..
         } => {
-            visitor.visit_expr(target);
             visitor.visit_expr(iter);
+            visitor.visit_expr(target);
             for stmt in body {
                 visitor.visit_stmt(stmt);
             }

src/ast/whitespace.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::str::Lines;
 
 use rustpython_ast::{Located, Location};
@@ -5,31 +6,26 @@ use rustpython_ast::{Located, Location};
 use crate::ast::types::Range;
 use crate::check_ast::Checker;
 
+/// Extract the leading indentation from a line.
+pub fn indentation<'a, T>(checker: &'a Checker, located: &'a Located<T>) -> Cow<'a, str> {
+    let range = Range::from_located(located);
+    checker.locator.slice_source_code_range(&Range {
+        location: Location::new(range.location.row(), 0),
+        end_location: Location::new(range.location.row(), range.location.column()),
+    })
+}
+
 /// Extract the leading words from a line of text.
-pub fn leading_words(line: &str) -> String {
-    line.trim()
-        .chars()
-        .take_while(|char| char.is_alphanumeric() || char.is_whitespace())
-        .collect()
+pub fn leading_words(line: &str) -> &str {
+    let line = line.trim();
+    line.find(|char: char| !char.is_alphanumeric() && !char.is_whitespace())
+        .map_or(line, |index| &line[..index])
 }
 
 /// Extract the leading whitespace from a line of text.
-pub fn leading_space(line: &str) -> String {
-    line.chars()
-        .take_while(|char| char.is_whitespace())
-        .collect()
-}
-
-/// Extract the leading indentation from a line.
-pub fn indentation<T>(checker: &Checker, located: &Located<T>) -> String {
-    let range = Range::from_located(located);
-    checker
-        .locator
-        .slice_source_code_range(&Range {
-            location: Location::new(range.location.row(), 0),
-            end_location: Location::new(range.location.row(), range.location.column()),
-        })
-        .to_string()
+pub fn leading_space(line: &str) -> &str {
+    line.find(|char: char| !char.is_whitespace())
+        .map_or(line, |index| &line[..index])
 }
 
 /// Replace any non-whitespace characters from an indentation string.

src/check_imports.rs

@@ -1,5 +1,7 @@
 //! Lint rules based on import analysis.
 
+use std::path::Path;
+
 use rustpython_parser::ast::Suite;
 
 use crate::ast::visitor::Visitor;
@@ -33,8 +35,9 @@ pub fn check_imports(
     directives: &IsortDirectives,
     settings: &Settings,
     autofix: bool,
+    path: &Path,
 ) -> Vec<Check> {
-    let mut tracker = ImportTracker::new(directives);
+    let mut tracker = ImportTracker::new(directives, path);
     for stmt in python_ast {
         tracker.visit_stmt(stmt);
     }

src/check_lines.rs

@@ -7,7 +7,7 @@ use rustpython_parser::ast::Location;
 
 use crate::ast::types::Range;
 use crate::autofix::Fix;
-use crate::checks::{Check, CheckCode, CheckKind, REDIRECTS};
+use crate::checks::{Check, CheckCode, CheckKind, CODE_REDIRECTS};
 use crate::noqa;
 use crate::noqa::{is_file_exempt, Directive};
 use crate::settings::Settings;
@@ -209,7 +209,7 @@ pub fn check_lines(
                     let mut invalid_codes = vec![];
                     let mut valid_codes = vec![];
                     for code in codes {
-                        let code = REDIRECTS.get(code).map_or(code, AsRef::as_ref);
+                        let code = CODE_REDIRECTS.get(code).map_or(code, AsRef::as_ref);
                         if matches.contains(&code) || settings.external.contains(code) {
                             valid_codes.push(code.to_string());
                         } else {

src/checks.rs

@@ -87,11 +87,13 @@ pub enum CheckCode {
     F706,
     F707,
     F722,
+    F811,
     F821,
     F822,
     F823,
     F831,
     F841,
+    F842,
     F901,
     // pylint
     PLC0414,
@@ -160,7 +162,7 @@ pub enum CheckCode {
     // mccabe
     C901,
     // flake8-tidy-imports
-    I252,
+    TID252,
     // flake8-return
     RET501,
     RET502,
@@ -242,6 +244,7 @@ pub enum CheckCode {
     D214,
     D215,
     D300,
+    D301,
     D400,
     D402,
     D403,
@@ -292,6 +295,12 @@ pub enum CheckCode {
     FBT001,
     FBT002,
     FBT003,
+    // flake8-unused-arguments
+    ARG001,
+    ARG002,
+    ARG003,
+    ARG004,
+    ARG005,
     // flake8-import-conventions
     ICN001,
     // Ruff
@@ -326,6 +335,7 @@ pub enum CheckCategory {
     Flake8Quotes,
     Flake8Return,
     Flake8TidyImports,
+    Flake8UnusedArguments,
     Eradicate,
     PygrepHooks,
     Pylint,
@@ -364,6 +374,7 @@ impl CheckCategory {
             CheckCategory::Flake8Quotes => "flake8-quotes",
             CheckCategory::Flake8Return => "flake8-return",
             CheckCategory::Flake8TidyImports => "flake8-tidy-imports",
+            CheckCategory::Flake8UnusedArguments => "flake8-unused-arguments",
             CheckCategory::Isort => "isort",
             CheckCategory::McCabe => "mccabe",
             CheckCategory::PEP8Naming => "pep8-naming",
@@ -392,8 +403,9 @@ impl CheckCategory {
             CheckCategory::Flake8Print => vec![CheckCodePrefix::T20],
             CheckCategory::Flake8Quotes => vec![CheckCodePrefix::Q],
             CheckCategory::Flake8Return => vec![CheckCodePrefix::RET],
-            CheckCategory::Flake8TidyImports => vec![CheckCodePrefix::I25],
-            CheckCategory::Isort => vec![CheckCodePrefix::I00],
+            CheckCategory::Flake8TidyImports => vec![CheckCodePrefix::TID],
+            CheckCategory::Flake8UnusedArguments => vec![CheckCodePrefix::ARG],
+            CheckCategory::Isort => vec![CheckCodePrefix::I],
             CheckCategory::McCabe => vec![CheckCodePrefix::C90],
             CheckCategory::PEP8Naming => vec![CheckCodePrefix::N],
             CheckCategory::Pycodestyle => vec![CheckCodePrefix::E, CheckCodePrefix::W],
@@ -470,6 +482,10 @@ impl CheckCategory {
                 "https://pypi.org/project/flake8-tidy-imports/4.8.0/",
                 &Platform::PyPI,
             )),
+            CheckCategory::Flake8UnusedArguments => Some((
+                "https://pypi.org/project/flake8-unused-arguments/0.0.12/",
+                &Platform::PyPI,
+            )),
             CheckCategory::Isort => {
                 Some(("https://pypi.org/project/isort/5.10.1/", &Platform::PyPI))
             }
@@ -603,6 +619,7 @@ pub enum CheckKind {
     PercentFormatStarRequiresSequence,
     PercentFormatUnsupportedFormatCharacter(char),
     RaiseNotImplemented,
+    RedefinedWhileUnused(String, usize),
     ReturnOutsideFunction,
     StringDotFormatExtraNamedArguments(Vec<String>),
     StringDotFormatExtraPositionalArguments(Vec<String>),
@@ -612,6 +629,7 @@ pub enum CheckKind {
     TwoStarredExpressions,
     UndefinedExport(String),
     UndefinedLocal(String),
+    UnusedAnnotation(String),
     UndefinedName(String),
     UnusedImport(String, bool),
     UnusedVariable(String),
@@ -625,7 +643,7 @@ pub enum CheckKind {
     ConsiderUsingFromImport(String, String),
     AwaitOutsideAsync,
     UselessElseOnLoop,
-    ConsiderUsingSysExit,
+    UseSysExit(String),
     // flake8-builtins
     BuiltinVariableShadowing(String),
     BuiltinArgumentShadowing(String),
@@ -781,6 +799,7 @@ pub enum CheckKind {
     SectionUnderlineMatchesSectionLength(String),
     SectionUnderlineNotOverIndented(String),
     SkipDocstring,
+    UsesRPrefixForBackslashedContent,
     UsesTripleQuotes,
     // pep8-naming
     InvalidClassName(String),
@@ -817,6 +836,12 @@ pub enum CheckKind {
     BooleanPositionalValueInFunctionCall,
     // pygrep-hooks
     NoEval,
+    // flake8-unused-arguments
+    UnusedFunctionArgument(String),
+    UnusedMethodArgument(String),
+    UnusedClassMethodArgument(String),
+    UnusedStaticMethodArgument(String),
+    UnusedLambdaArgument(String),
     // flake8-import-conventions
     ImportAliasIsNotConventional(String, String),
     // Ruff
@@ -913,11 +938,13 @@ impl CheckCode {
             CheckCode::F706 => CheckKind::ReturnOutsideFunction,
             CheckCode::F707 => CheckKind::DefaultExceptNotLast,
             CheckCode::F722 => CheckKind::ForwardAnnotationSyntaxError("...".to_string()),
+            CheckCode::F811 => CheckKind::RedefinedWhileUnused("...".to_string(), 1),
             CheckCode::F821 => CheckKind::UndefinedName("...".to_string()),
             CheckCode::F822 => CheckKind::UndefinedExport("...".to_string()),
             CheckCode::F823 => CheckKind::UndefinedLocal("...".to_string()),
             CheckCode::F831 => CheckKind::DuplicateArgumentName,
             CheckCode::F841 => CheckKind::UnusedVariable("...".to_string()),
+            CheckCode::F842 => CheckKind::UnusedAnnotation("...".to_string()),
             CheckCode::F901 => CheckKind::RaiseNotImplemented,
             // pylint
             CheckCode::PLC0414 => CheckKind::UselessImportAlias,
@@ -931,7 +958,7 @@ impl CheckCode {
             CheckCode::PLR1701 => {
                 CheckKind::ConsiderMergingIsinstance("...".to_string(), vec!["...".to_string()])
             }
-            CheckCode::PLR1722 => CheckKind::ConsiderUsingSysExit,
+            CheckCode::PLR1722 => CheckKind::UseSysExit("exit".to_string()),
             CheckCode::PLW0120 => CheckKind::UselessElseOnLoop,
             // flake8-builtins
             CheckCode::A001 => CheckKind::BuiltinVariableShadowing("...".to_string()),
@@ -1003,7 +1030,7 @@ impl CheckCode {
             // flake8-debugger
             CheckCode::T100 => CheckKind::Debugger(DebuggerUsingType::Import("...".to_string())),
             // flake8-tidy-imports
-            CheckCode::I252 => CheckKind::BannedRelativeImport(Strictness::All),
+            CheckCode::TID252 => CheckKind::BannedRelativeImport(Strictness::All),
             // flake8-return
             CheckCode::RET501 => CheckKind::UnnecessaryReturnNone,
             CheckCode::RET502 => CheckKind::ImplicitReturnValue,
@@ -1090,6 +1117,7 @@ impl CheckCode {
             CheckCode::D214 => CheckKind::SectionNotOverIndented("Returns".to_string()),
             CheckCode::D215 => CheckKind::SectionUnderlineNotOverIndented("Returns".to_string()),
             CheckCode::D300 => CheckKind::UsesTripleQuotes,
+            CheckCode::D301 => CheckKind::UsesRPrefixForBackslashedContent,
             CheckCode::D400 => CheckKind::EndsInPeriod,
             CheckCode::D402 => CheckKind::NoSignature,
             CheckCode::D403 => CheckKind::FirstLineCapitalized,
@@ -1159,6 +1187,12 @@ impl CheckCode {
             CheckCode::FBT003 => CheckKind::BooleanPositionalValueInFunctionCall,
             // pygrep-hooks
             CheckCode::PGH001 => CheckKind::NoEval,
+            // flake8-unused-arguments
+            CheckCode::ARG001 => CheckKind::UnusedFunctionArgument("...".to_string()),
+            CheckCode::ARG002 => CheckKind::UnusedMethodArgument("...".to_string()),
+            CheckCode::ARG003 => CheckKind::UnusedClassMethodArgument("...".to_string()),
+            CheckCode::ARG004 => CheckKind::UnusedStaticMethodArgument("...".to_string()),
+            CheckCode::ARG005 => CheckKind::UnusedLambdaArgument("...".to_string()),
             // flake8-import-conventions
             CheckCode::ICN001 => {
                 CheckKind::ImportAliasIsNotConventional("...".to_string(), "...".to_string())
@@ -1188,6 +1222,11 @@ impl CheckCode {
             CheckCode::ANN205 => CheckCategory::Flake8Annotations,
             CheckCode::ANN206 => CheckCategory::Flake8Annotations,
             CheckCode::ANN401 => CheckCategory::Flake8Annotations,
+            CheckCode::ARG001 => CheckCategory::Flake8UnusedArguments,
+            CheckCode::ARG002 => CheckCategory::Flake8UnusedArguments,
+            CheckCode::ARG003 => CheckCategory::Flake8UnusedArguments,
+            CheckCode::ARG004 => CheckCategory::Flake8UnusedArguments,
+            CheckCode::ARG005 => CheckCategory::Flake8UnusedArguments,
             CheckCode::B002 => CheckCategory::Flake8Bugbear,
             CheckCode::B003 => CheckCategory::Flake8Bugbear,
             CheckCode::B004 => CheckCategory::Flake8Bugbear,
@@ -1259,6 +1298,7 @@ impl CheckCode {
             CheckCode::D214 => CheckCategory::Pydocstyle,
             CheckCode::D215 => CheckCategory::Pydocstyle,
             CheckCode::D300 => CheckCategory::Pydocstyle,
+            CheckCode::D301 => CheckCategory::Pydocstyle,
             CheckCode::D400 => CheckCategory::Pydocstyle,
             CheckCode::D402 => CheckCategory::Pydocstyle,
             CheckCode::D403 => CheckCategory::Pydocstyle,
@@ -1329,18 +1369,20 @@ impl CheckCode {
             CheckCode::F706 => CheckCategory::Pyflakes,
             CheckCode::F707 => CheckCategory::Pyflakes,
             CheckCode::F722 => CheckCategory::Pyflakes,
+            CheckCode::F811 => CheckCategory::Pyflakes,
             CheckCode::F821 => CheckCategory::Pyflakes,
             CheckCode::F822 => CheckCategory::Pyflakes,
             CheckCode::F823 => CheckCategory::Pyflakes,
             CheckCode::F831 => CheckCategory::Pyflakes,
             CheckCode::F841 => CheckCategory::Pyflakes,
+            CheckCode::F842 => CheckCategory::Pyflakes,
             CheckCode::F901 => CheckCategory::Pyflakes,
             CheckCode::FBT001 => CheckCategory::Flake8BooleanTrap,
             CheckCode::FBT002 => CheckCategory::Flake8BooleanTrap,
             CheckCode::FBT003 => CheckCategory::Flake8BooleanTrap,
             CheckCode::I001 => CheckCategory::Isort,
+            CheckCode::TID252 => CheckCategory::Flake8TidyImports,
             CheckCode::ICN001 => CheckCategory::Flake8ImportConventions,
-            CheckCode::I252 => CheckCategory::Flake8TidyImports,
             CheckCode::N801 => CheckCategory::PEP8Naming,
             CheckCode::N802 => CheckCategory::PEP8Naming,
             CheckCode::N803 => CheckCategory::PEP8Naming,
@@ -1478,9 +1520,11 @@ impl CheckKind {
             CheckKind::TypeComparison => &CheckCode::E721,
             CheckKind::UndefinedExport(_) => &CheckCode::F822,
             CheckKind::UndefinedLocal(_) => &CheckCode::F823,
+            CheckKind::RedefinedWhileUnused(..) => &CheckCode::F811,
             CheckKind::UndefinedName(_) => &CheckCode::F821,
             CheckKind::UnusedImport(..) => &CheckCode::F401,
             CheckKind::UnusedVariable(_) => &CheckCode::F841,
+            CheckKind::UnusedAnnotation(_) => &CheckCode::F842,
             CheckKind::YieldOutsideFunction(_) => &CheckCode::F704,
             // pycodestyle warnings
             CheckKind::NoNewLineAtEndOfFile => &CheckCode::W292,
@@ -1493,7 +1537,7 @@ impl CheckKind {
             CheckKind::ConsiderMergingIsinstance(..) => &CheckCode::PLR1701,
             CheckKind::PropertyWithParameters => &CheckCode::PLR0206,
             CheckKind::ConsiderUsingFromImport(..) => &CheckCode::PLR0402,
-            CheckKind::ConsiderUsingSysExit => &CheckCode::PLR1722,
+            CheckKind::UseSysExit(_) => &CheckCode::PLR1722,
             CheckKind::UselessElseOnLoop => &CheckCode::PLW0120,
             // flake8-builtins
             CheckKind::BuiltinVariableShadowing(_) => &CheckCode::A001,
@@ -1550,7 +1594,7 @@ impl CheckKind {
             // flake8-debugger
             CheckKind::Debugger(_) => &CheckCode::T100,
             // flake8-tidy-imports
-            CheckKind::BannedRelativeImport(_) => &CheckCode::I252,
+            CheckKind::BannedRelativeImport(_) => &CheckCode::TID252,
             // flake8-return
             CheckKind::UnnecessaryReturnNone => &CheckCode::RET501,
             CheckKind::ImplicitReturnValue => &CheckCode::RET502,
@@ -1650,6 +1694,7 @@ impl CheckKind {
             CheckKind::SectionUnderlineMatchesSectionLength(_) => &CheckCode::D409,
             CheckKind::SectionUnderlineNotOverIndented(_) => &CheckCode::D215,
             CheckKind::SkipDocstring => &CheckCode::D418,
+            CheckKind::UsesRPrefixForBackslashedContent => &CheckCode::D301,
             CheckKind::UsesTripleQuotes => &CheckCode::D300,
             // pep8-naming
             CheckKind::InvalidClassName(_) => &CheckCode::N801,
@@ -1686,6 +1731,12 @@ impl CheckKind {
             CheckKind::BooleanPositionalValueInFunctionCall => &CheckCode::FBT003,
             // pygrep-hooks
             CheckKind::NoEval => &CheckCode::PGH001,
+            // flake8-unused-arguments
+            CheckKind::UnusedFunctionArgument(..) => &CheckCode::ARG001,
+            CheckKind::UnusedMethodArgument(..) => &CheckCode::ARG002,
+            CheckKind::UnusedClassMethodArgument(..) => &CheckCode::ARG003,
+            CheckKind::UnusedStaticMethodArgument(..) => &CheckCode::ARG004,
+            CheckKind::UnusedLambdaArgument(..) => &CheckCode::ARG005,
             // flake8-import-conventions
             CheckKind::ImportAliasIsNotConventional(..) => &CheckCode::ICN001,
             // Ruff
@@ -1810,6 +1861,9 @@ impl CheckKind {
             CheckKind::RaiseNotImplemented => {
                 "`raise NotImplemented` should be `raise NotImplementedError`".to_string()
             }
+            CheckKind::RedefinedWhileUnused(name, line) => {
+                format!("Redefinition of unused `{name}` from line {line}")
+            }
             CheckKind::ReturnOutsideFunction => {
                 "`return` statement outside of a function/method".to_string()
             }
@@ -1858,6 +1912,9 @@ impl CheckKind {
             CheckKind::UndefinedName(name) => {
                 format!("Undefined name `{name}`")
             }
+            CheckKind::UnusedAnnotation(name) => {
+                format!("Local variable `{name}` is annotated but never used")
+            }
             CheckKind::UnusedImport(name, ignore_init) => {
                 if *ignore_init {
                     format!(
@@ -1885,10 +1942,10 @@ impl CheckKind {
             }
             CheckKind::ConsiderMergingIsinstance(obj, types) => {
                 let types = types.join(", ");
-                format!("Consider merging these isinstance calls: `isinstance({obj}, ({types}))`")
+                format!("Merge these isinstance calls: `isinstance({obj}, ({types}))`")
             }
-            CheckKind::MisplacedComparisonConstant(comprison) => {
-                format!("Comparison should be {comprison}")
+            CheckKind::MisplacedComparisonConstant(comparison) => {
+                format!("Comparison should be {comparison}")
             }
             CheckKind::UnnecessaryDirectLambdaCall => "Lambda expression called directly. Execute \
                                                        the expression inline instead."
@@ -1897,7 +1954,7 @@ impl CheckKind {
                 "Cannot have defined parameters for properties".to_string()
             }
             CheckKind::ConsiderUsingFromImport(module, name) => {
-                format!("Consider using `from {module} import {name}`")
+                format!("Use `from {module} import {name}` in lieu of alias")
             }
             CheckKind::AwaitOutsideAsync => {
                 "`await` should be used within an async function".to_string()
@@ -1905,7 +1962,7 @@ impl CheckKind {
             CheckKind::UselessElseOnLoop => "Else clause on loop without a break statement, \
                                              remove the else and de-indent all the code inside it"
                 .to_string(),
-            CheckKind::ConsiderUsingSysExit => "Consider using `sys.exit()`".to_string(),
+            CheckKind::UseSysExit(name) => format!("Use `sys.exit()` instead of `{name}`"),
             // flake8-builtins
             CheckKind::BuiltinVariableShadowing(name) => {
                 format!("Variable `{name}` is shadowing a python builtin")
@@ -2296,6 +2353,9 @@ impl CheckKind {
             CheckKind::FirstLineCapitalized => {
                 "First word of the first line should be properly capitalized".to_string()
             }
+            CheckKind::UsesRPrefixForBackslashedContent => {
+                r#"Use r""" if any backslashes in a docstring"#.to_string()
+            }
             CheckKind::UsesTripleQuotes => r#"Use """triple double quotes""""#.to_string(),
             CheckKind::MultiLineSummaryFirstLine => {
                 "Multi-line docstring summary should start at the first line".to_string()
@@ -2477,6 +2537,18 @@ impl CheckKind {
             }
             // pygrep-hooks
             CheckKind::NoEval => "No builtin `eval()` allowed".to_string(),
+            // flake8-unused-arguments
+            CheckKind::UnusedFunctionArgument(name) => {
+                format!("Unused function argument: `{name}`")
+            }
+            CheckKind::UnusedMethodArgument(name) => format!("Unused method argument: `{name}`"),
+            CheckKind::UnusedClassMethodArgument(name) => {
+                format!("Unused class method argument: `{name}`")
+            }
+            CheckKind::UnusedStaticMethodArgument(name) => {
+                format!("Unused static method argument: `{name}`")
+            }
+            CheckKind::UnusedLambdaArgument(name) => format!("Unused lambda argument: `{name}`"),
             // flake8-import-conventions
             CheckKind::ImportAliasIsNotConventional(name, asname) => {
                 format!("`{name}` should be imported as `{asname}`")
@@ -2551,7 +2623,6 @@ impl CheckKind {
                 | CheckKind::BlankLineBeforeSection(..)
                 | CheckKind::CapitalizeSectionName(..)
                 | CheckKind::CommentedOutCode
-                | CheckKind::ConsiderUsingSysExit
                 | CheckKind::ConvertNamedTupleFunctionalToClass(..)
                 | CheckKind::ConvertTypedDictFunctionalToClass(..)
                 | CheckKind::DashedUnderlineAfterSection(..)
@@ -2617,6 +2688,7 @@ impl CheckKind {
                 | CheckKind::UnusedNOQA(..)
                 | CheckKind::UsePEP585Annotation(..)
                 | CheckKind::UsePEP604Annotation
+                | CheckKind::UseSysExit(..)
                 | CheckKind::UselessImportAlias
                 | CheckKind::UselessMetaclassType
                 | CheckKind::UselessObjectInheritance(..)
@@ -2648,7 +2720,7 @@ impl Check {
 }
 
 /// A hash map from deprecated to latest `CheckCode`.
-pub static REDIRECTS: Lazy<FxHashMap<&'static str, CheckCode>> = Lazy::new(|| {
+pub static CODE_REDIRECTS: Lazy<FxHashMap<&'static str, CheckCode>> = Lazy::new(|| {
     FxHashMap::from_iter([
         // TODO(charlie): Remove by 2023-01-01.
         ("U001", CheckCode::UP001),
@@ -2665,6 +2737,25 @@ pub static REDIRECTS: Lazy<FxHashMap<&'static str, CheckCode>> = Lazy::new(|| {
         ("U013", CheckCode::UP013),
         ("U014", CheckCode::UP014),
         ("U015", CheckCode::UP015),
+        // TODO(charlie): Remove by 2023-02-01.
+        ("I252", CheckCode::TID252),
+        ("M001", CheckCode::RUF100),
+    ])
+});
+
+/// A hash map from deprecated `CheckCodePrefix` to latest `CheckCodePrefix`.
+pub static PREFIX_REDIRECTS: Lazy<FxHashMap<&'static str, &'static str>> = Lazy::new(|| {
+    FxHashMap::from_iter([
+        // TODO(charlie): Remove by 2023-01-01.
+        ("U", "UP"),
+        ("U0", "UP0"),
+        ("U00", "UP00"),
+        ("U01", "UP01"),
+        // TODO(charlie): Remove by 2023-02-01.
+        ("I2", "TID2"),
+        ("I25", "TID25"),
+        ("M", "RUF100"),
+        ("M0", "RUF100"),
     ])
 });
 

src/checks_gen.rs

@@ -36,6 +36,14 @@ pub enum CheckCodePrefix {
     ANN4,
     ANN40,
     ANN401,
+    ARG,
+    ARG0,
+    ARG00,
+    ARG001,
+    ARG002,
+    ARG003,
+    ARG004,
+    ARG005,
     B,
     B0,
     B00,
@@ -131,6 +139,7 @@ pub enum CheckCodePrefix {
     D3,
     D30,
     D300,
+    D301,
     D4,
     D40,
     D400,
@@ -235,6 +244,8 @@ pub enum CheckCodePrefix {
     F72,
     F722,
     F8,
+    F81,
+    F811,
     F82,
     F821,
     F822,
@@ -243,6 +254,7 @@ pub enum CheckCodePrefix {
     F831,
     F84,
     F841,
+    F842,
     F9,
     F90,
     F901,
@@ -263,6 +275,9 @@ pub enum CheckCodePrefix {
     ICN0,
     ICN00,
     ICN001,
+    M,
+    M0,
+    M001,
     N,
     N8,
     N80,
@@ -367,6 +382,10 @@ pub enum CheckCodePrefix {
     T20,
     T201,
     T203,
+    TID,
+    TID2,
+    TID25,
+    TID252,
     U,
     U0,
     U00,
@@ -492,6 +511,32 @@ impl CheckCodePrefix {
             CheckCodePrefix::ANN4 => vec![CheckCode::ANN401],
             CheckCodePrefix::ANN40 => vec![CheckCode::ANN401],
             CheckCodePrefix::ANN401 => vec![CheckCode::ANN401],
+            CheckCodePrefix::ARG => vec![
+                CheckCode::ARG001,
+                CheckCode::ARG002,
+                CheckCode::ARG003,
+                CheckCode::ARG004,
+                CheckCode::ARG005,
+            ],
+            CheckCodePrefix::ARG0 => vec![
+                CheckCode::ARG001,
+                CheckCode::ARG002,
+                CheckCode::ARG003,
+                CheckCode::ARG004,
+                CheckCode::ARG005,
+            ],
+            CheckCodePrefix::ARG00 => vec![
+                CheckCode::ARG001,
+                CheckCode::ARG002,
+                CheckCode::ARG003,
+                CheckCode::ARG004,
+                CheckCode::ARG005,
+            ],
+            CheckCodePrefix::ARG001 => vec![CheckCode::ARG001],
+            CheckCodePrefix::ARG002 => vec![CheckCode::ARG002],
+            CheckCodePrefix::ARG003 => vec![CheckCode::ARG003],
+            CheckCodePrefix::ARG004 => vec![CheckCode::ARG004],
+            CheckCodePrefix::ARG005 => vec![CheckCode::ARG005],
             CheckCodePrefix::B => vec![
                 CheckCode::B002,
                 CheckCode::B003,
@@ -718,6 +763,7 @@ impl CheckCodePrefix {
                 CheckCode::D214,
                 CheckCode::D215,
                 CheckCode::D300,
+                CheckCode::D301,
                 CheckCode::D400,
                 CheckCode::D402,
                 CheckCode::D403,
@@ -820,9 +866,10 @@ impl CheckCodePrefix {
             CheckCodePrefix::D213 => vec![CheckCode::D213],
             CheckCodePrefix::D214 => vec![CheckCode::D214],
             CheckCodePrefix::D215 => vec![CheckCode::D215],
-            CheckCodePrefix::D3 => vec![CheckCode::D300],
-            CheckCodePrefix::D30 => vec![CheckCode::D300],
+            CheckCodePrefix::D3 => vec![CheckCode::D300, CheckCode::D301],
+            CheckCodePrefix::D30 => vec![CheckCode::D300, CheckCode::D301],
             CheckCodePrefix::D300 => vec![CheckCode::D300],
+            CheckCodePrefix::D301 => vec![CheckCode::D301],
             CheckCodePrefix::D4 => vec![
                 CheckCode::D400,
                 CheckCode::D402,
@@ -985,11 +1032,13 @@ impl CheckCodePrefix {
                 CheckCode::F706,
                 CheckCode::F707,
                 CheckCode::F722,
+                CheckCode::F811,
                 CheckCode::F821,
                 CheckCode::F822,
                 CheckCode::F823,
                 CheckCode::F831,
                 CheckCode::F841,
+                CheckCode::F842,
                 CheckCode::F901,
             ],
             CheckCodePrefix::F4 => vec![
@@ -1117,20 +1166,25 @@ impl CheckCodePrefix {
             CheckCodePrefix::F72 => vec![CheckCode::F722],
             CheckCodePrefix::F722 => vec![CheckCode::F722],
             CheckCodePrefix::F8 => vec![
+                CheckCode::F811,
                 CheckCode::F821,
                 CheckCode::F822,
                 CheckCode::F823,
                 CheckCode::F831,
                 CheckCode::F841,
+                CheckCode::F842,
             ],
+            CheckCodePrefix::F81 => vec![CheckCode::F811],
+            CheckCodePrefix::F811 => vec![CheckCode::F811],
             CheckCodePrefix::F82 => vec![CheckCode::F821, CheckCode::F822, CheckCode::F823],
             CheckCodePrefix::F821 => vec![CheckCode::F821],
             CheckCodePrefix::F822 => vec![CheckCode::F822],
             CheckCodePrefix::F823 => vec![CheckCode::F823],
             CheckCodePrefix::F83 => vec![CheckCode::F831],
             CheckCodePrefix::F831 => vec![CheckCode::F831],
-            CheckCodePrefix::F84 => vec![CheckCode::F841],
+            CheckCodePrefix::F84 => vec![CheckCode::F841, CheckCode::F842],
             CheckCodePrefix::F841 => vec![CheckCode::F841],
+            CheckCodePrefix::F842 => vec![CheckCode::F842],
             CheckCodePrefix::F9 => vec![CheckCode::F901],
             CheckCodePrefix::F90 => vec![CheckCode::F901],
             CheckCodePrefix::F901 => vec![CheckCode::F901],
@@ -1140,17 +1194,68 @@ impl CheckCodePrefix {
             CheckCodePrefix::FBT001 => vec![CheckCode::FBT001],
             CheckCodePrefix::FBT002 => vec![CheckCode::FBT002],
             CheckCodePrefix::FBT003 => vec![CheckCode::FBT003],
-            CheckCodePrefix::I => vec![CheckCode::I252, CheckCode::I001],
+            CheckCodePrefix::I => vec![CheckCode::I001],
             CheckCodePrefix::I0 => vec![CheckCode::I001],
             CheckCodePrefix::I00 => vec![CheckCode::I001],
             CheckCodePrefix::I001 => vec![CheckCode::I001],
-            CheckCodePrefix::I2 => vec![CheckCode::I252],
-            CheckCodePrefix::I25 => vec![CheckCode::I252],
-            CheckCodePrefix::I252 => vec![CheckCode::I252],
+            CheckCodePrefix::I2 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`I2` has been remapped to `TID2`".bold()
+                );
+                vec![CheckCode::TID252]
+            }
+            CheckCodePrefix::I25 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`I25` has been remapped to `TID25`".bold()
+                );
+                vec![CheckCode::TID252]
+            }
+            CheckCodePrefix::I252 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`I252` has been remapped to `TID252`".bold()
+                );
+                vec![CheckCode::TID252]
+            }
             CheckCodePrefix::ICN => vec![CheckCode::ICN001],
             CheckCodePrefix::ICN0 => vec![CheckCode::ICN001],
             CheckCodePrefix::ICN00 => vec![CheckCode::ICN001],
             CheckCodePrefix::ICN001 => vec![CheckCode::ICN001],
+            CheckCodePrefix::M => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`M` has been remapped to `RUF100`".bold()
+                );
+                vec![CheckCode::RUF100]
+            }
+            CheckCodePrefix::M0 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`M0` has been remapped to `RUF100`".bold()
+                );
+                vec![CheckCode::RUF100]
+            }
+            CheckCodePrefix::M001 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`M001` has been remapped to `RUF100`".bold()
+                );
+                vec![CheckCode::RUF100]
+            }
             CheckCodePrefix::N => vec![
                 CheckCode::N801,
                 CheckCode::N802,
@@ -1379,54 +1484,82 @@ impl CheckCodePrefix {
             CheckCodePrefix::T20 => vec![CheckCode::T201, CheckCode::T203],
             CheckCodePrefix::T201 => vec![CheckCode::T201],
             CheckCodePrefix::T203 => vec![CheckCode::T203],
-            CheckCodePrefix::U => vec![
-                CheckCode::UP001,
-                CheckCode::UP003,
-                CheckCode::UP004,
-                CheckCode::UP005,
-                CheckCode::UP006,
-                CheckCode::UP007,
-                CheckCode::UP008,
-                CheckCode::UP009,
-                CheckCode::UP010,
-                CheckCode::UP011,
-                CheckCode::UP012,
-                CheckCode::UP013,
-                CheckCode::UP014,
-                CheckCode::UP015,
-            ],
-            CheckCodePrefix::U0 => vec![
-                CheckCode::UP001,
-                CheckCode::UP003,
-                CheckCode::UP004,
-                CheckCode::UP005,
-                CheckCode::UP006,
-                CheckCode::UP007,
-                CheckCode::UP008,
-                CheckCode::UP009,
-                CheckCode::UP010,
-                CheckCode::UP011,
-                CheckCode::UP012,
-                CheckCode::UP013,
-                CheckCode::UP014,
-                CheckCode::UP015,
-            ],
-            CheckCodePrefix::U00 => vec![
-                CheckCode::UP001,
-                CheckCode::UP003,
-                CheckCode::UP004,
-                CheckCode::UP005,
-                CheckCode::UP006,
-                CheckCode::UP007,
-                CheckCode::UP008,
-                CheckCode::UP009,
-            ],
+            CheckCodePrefix::TID => vec![CheckCode::TID252],
+            CheckCodePrefix::TID2 => vec![CheckCode::TID252],
+            CheckCodePrefix::TID25 => vec![CheckCode::TID252],
+            CheckCodePrefix::TID252 => vec![CheckCode::TID252],
+            CheckCodePrefix::U => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`U` has been remapped to `UP`".bold()
+                );
+                vec![
+                    CheckCode::UP001,
+                    CheckCode::UP003,
+                    CheckCode::UP004,
+                    CheckCode::UP005,
+                    CheckCode::UP006,
+                    CheckCode::UP007,
+                    CheckCode::UP008,
+                    CheckCode::UP009,
+                    CheckCode::UP010,
+                    CheckCode::UP011,
+                    CheckCode::UP012,
+                    CheckCode::UP013,
+                    CheckCode::UP014,
+                    CheckCode::UP015,
+                ]
+            }
+            CheckCodePrefix::U0 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`U0` has been remapped to `UP0`".bold()
+                );
+                vec![
+                    CheckCode::UP001,
+                    CheckCode::UP003,
+                    CheckCode::UP004,
+                    CheckCode::UP005,
+                    CheckCode::UP006,
+                    CheckCode::UP007,
+                    CheckCode::UP008,
+                    CheckCode::UP009,
+                    CheckCode::UP010,
+                    CheckCode::UP011,
+                    CheckCode::UP012,
+                    CheckCode::UP013,
+                    CheckCode::UP014,
+                    CheckCode::UP015,
+                ]
+            }
+            CheckCodePrefix::U00 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`U00` has been remapped to `UP00`".bold()
+                );
+                vec![
+                    CheckCode::UP001,
+                    CheckCode::UP003,
+                    CheckCode::UP004,
+                    CheckCode::UP005,
+                    CheckCode::UP006,
+                    CheckCode::UP007,
+                    CheckCode::UP008,
+                    CheckCode::UP009,
+                ]
+            }
             CheckCodePrefix::U001 => {
                 eprintln!(
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U001` has been renamed to `UP001`".bold()
+                    "`U001` has been remapped to `UP001`".bold()
                 );
                 vec![CheckCode::UP001]
             }
@@ -1435,7 +1568,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U003` has been renamed to `UP003`".bold()
+                    "`U003` has been remapped to `UP003`".bold()
                 );
                 vec![CheckCode::UP003]
             }
@@ -1444,7 +1577,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U004` has been renamed to `UP004`".bold()
+                    "`U004` has been remapped to `UP004`".bold()
                 );
                 vec![CheckCode::UP004]
             }
@@ -1453,7 +1586,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U005` has been renamed to `UP005`".bold()
+                    "`U005` has been remapped to `UP005`".bold()
                 );
                 vec![CheckCode::UP005]
             }
@@ -1462,7 +1595,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U006` has been renamed to `UP006`".bold()
+                    "`U006` has been remapped to `UP006`".bold()
                 );
                 vec![CheckCode::UP006]
             }
@@ -1471,7 +1604,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U007` has been renamed to `UP007`".bold()
+                    "`U007` has been remapped to `UP007`".bold()
                 );
                 vec![CheckCode::UP007]
             }
@@ -1480,7 +1613,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U008` has been renamed to `UP008`".bold()
+                    "`U008` has been remapped to `UP008`".bold()
                 );
                 vec![CheckCode::UP008]
             }
@@ -1489,24 +1622,32 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U009` has been renamed to `UP009`".bold()
+                    "`U009` has been remapped to `UP009`".bold()
                 );
                 vec![CheckCode::UP009]
             }
-            CheckCodePrefix::U01 => vec![
-                CheckCode::UP010,
-                CheckCode::UP011,
-                CheckCode::UP012,
-                CheckCode::UP013,
-                CheckCode::UP014,
-                CheckCode::UP015,
-            ],
+            CheckCodePrefix::U01 => {
+                eprintln!(
+                    "{}{} {}",
+                    "warning".yellow().bold(),
+                    ":".bold(),
+                    "`U01` has been remapped to `UP01`".bold()
+                );
+                vec![
+                    CheckCode::UP010,
+                    CheckCode::UP011,
+                    CheckCode::UP012,
+                    CheckCode::UP013,
+                    CheckCode::UP014,
+                    CheckCode::UP015,
+                ]
+            }
             CheckCodePrefix::U010 => {
                 eprintln!(
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U010` has been renamed to `UP010`".bold()
+                    "`U010` has been remapped to `UP010`".bold()
                 );
                 vec![CheckCode::UP010]
             }
@@ -1515,7 +1656,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U011` has been renamed to `UP011`".bold()
+                    "`U011` has been remapped to `UP011`".bold()
                 );
                 vec![CheckCode::UP011]
             }
@@ -1524,7 +1665,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U012` has been renamed to `UP012`".bold()
+                    "`U012` has been remapped to `UP012`".bold()
                 );
                 vec![CheckCode::UP012]
             }
@@ -1533,7 +1674,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U013` has been renamed to `UP013`".bold()
+                    "`U013` has been remapped to `UP013`".bold()
                 );
                 vec![CheckCode::UP013]
             }
@@ -1542,7 +1683,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U014` has been renamed to `UP014`".bold()
+                    "`U014` has been remapped to `UP014`".bold()
                 );
                 vec![CheckCode::UP014]
             }
@@ -1551,7 +1692,7 @@ impl CheckCodePrefix {
                     "{}{} {}",
                     "warning".yellow().bold(),
                     ":".bold(),
-                    "`U015` has been renamed to `UP015`".bold()
+                    "`U015` has been remapped to `UP015`".bold()
                 );
                 vec![CheckCode::UP015]
             }
@@ -1698,6 +1839,14 @@ impl CheckCodePrefix {
             CheckCodePrefix::ANN4 => SuffixLength::One,
             CheckCodePrefix::ANN40 => SuffixLength::Two,
             CheckCodePrefix::ANN401 => SuffixLength::Three,
+            CheckCodePrefix::ARG => SuffixLength::Zero,
+            CheckCodePrefix::ARG0 => SuffixLength::One,
+            CheckCodePrefix::ARG00 => SuffixLength::Two,
+            CheckCodePrefix::ARG001 => SuffixLength::Three,
+            CheckCodePrefix::ARG002 => SuffixLength::Three,
+            CheckCodePrefix::ARG003 => SuffixLength::Three,
+            CheckCodePrefix::ARG004 => SuffixLength::Three,
+            CheckCodePrefix::ARG005 => SuffixLength::Three,
             CheckCodePrefix::B => SuffixLength::Zero,
             CheckCodePrefix::B0 => SuffixLength::One,
             CheckCodePrefix::B00 => SuffixLength::Two,
@@ -1793,6 +1942,7 @@ impl CheckCodePrefix {
             CheckCodePrefix::D3 => SuffixLength::One,
             CheckCodePrefix::D30 => SuffixLength::Two,
             CheckCodePrefix::D300 => SuffixLength::Three,
+            CheckCodePrefix::D301 => SuffixLength::Three,
             CheckCodePrefix::D4 => SuffixLength::One,
             CheckCodePrefix::D40 => SuffixLength::Two,
             CheckCodePrefix::D400 => SuffixLength::Three,
@@ -1897,6 +2047,8 @@ impl CheckCodePrefix {
             CheckCodePrefix::F72 => SuffixLength::Two,
             CheckCodePrefix::F722 => SuffixLength::Three,
             CheckCodePrefix::F8 => SuffixLength::One,
+            CheckCodePrefix::F81 => SuffixLength::Two,
+            CheckCodePrefix::F811 => SuffixLength::Three,
             CheckCodePrefix::F82 => SuffixLength::Two,
             CheckCodePrefix::F821 => SuffixLength::Three,
             CheckCodePrefix::F822 => SuffixLength::Three,
@@ -1905,6 +2057,7 @@ impl CheckCodePrefix {
             CheckCodePrefix::F831 => SuffixLength::Three,
             CheckCodePrefix::F84 => SuffixLength::Two,
             CheckCodePrefix::F841 => SuffixLength::Three,
+            CheckCodePrefix::F842 => SuffixLength::Three,
             CheckCodePrefix::F9 => SuffixLength::One,
             CheckCodePrefix::F90 => SuffixLength::Two,
             CheckCodePrefix::F901 => SuffixLength::Three,
@@ -1925,6 +2078,9 @@ impl CheckCodePrefix {
             CheckCodePrefix::ICN0 => SuffixLength::One,
             CheckCodePrefix::ICN00 => SuffixLength::Two,
             CheckCodePrefix::ICN001 => SuffixLength::Three,
+            CheckCodePrefix::M => SuffixLength::Zero,
+            CheckCodePrefix::M0 => SuffixLength::One,
+            CheckCodePrefix::M001 => SuffixLength::Three,
             CheckCodePrefix::N => SuffixLength::Zero,
             CheckCodePrefix::N8 => SuffixLength::One,
             CheckCodePrefix::N80 => SuffixLength::Two,
@@ -2029,6 +2185,10 @@ impl CheckCodePrefix {
             CheckCodePrefix::T20 => SuffixLength::Two,
             CheckCodePrefix::T201 => SuffixLength::Three,
             CheckCodePrefix::T203 => SuffixLength::Three,
+            CheckCodePrefix::TID => SuffixLength::Zero,
+            CheckCodePrefix::TID2 => SuffixLength::One,
+            CheckCodePrefix::TID25 => SuffixLength::Two,
+            CheckCodePrefix::TID252 => SuffixLength::Three,
             CheckCodePrefix::U => SuffixLength::Zero,
             CheckCodePrefix::U0 => SuffixLength::One,
             CheckCodePrefix::U00 => SuffixLength::Two,
@@ -2096,6 +2256,7 @@ impl CheckCodePrefix {
 pub const CATEGORIES: &[CheckCodePrefix] = &[
     CheckCodePrefix::A,
     CheckCodePrefix::ANN,
+    CheckCodePrefix::ARG,
     CheckCodePrefix::B,
     CheckCodePrefix::BLE,
     CheckCodePrefix::C,
@@ -2117,7 +2278,7 @@ pub const CATEGORIES: &[CheckCodePrefix] = &[
     CheckCodePrefix::RUF,
     CheckCodePrefix::S,
     CheckCodePrefix::T,
-    CheckCodePrefix::U,
+    CheckCodePrefix::TID,
     CheckCodePrefix::UP,
     CheckCodePrefix::W,
     CheckCodePrefix::YTT,

src/docstrings/constants.rs

@@ -1,5 +1,9 @@
 pub const TRIPLE_QUOTE_PREFIXES: &[&str] = &[
-    "ur\"\"\"", "ur'''", "u\"\"\"", "u'''", "r\"\"\"", "r'''", "\"\"\"", "'''",
+    "ur\"\"\"", "ur'''", "u\"\"\"", "u'''", "r\"\"\"", "r'''", "UR\"\"\"", "UR'''", "Ur\"\"\"",
+    "Ur'''", "U\"\"\"", "U'''", "uR\"\"\"", "uR'''", "R\"\"\"", "R'''", "\"\"\"", "'''",
 ];
 
-pub const SINGLE_QUOTE_PREFIXES: &[&str] = &["ur\"", "ur'", "u\"", "u'", "r\"", "r'", "\"", "'"];
+pub const SINGLE_QUOTE_PREFIXES: &[&str] = &[
+    "ur\"", "ur'", "u\"", "u'", "r\"", "r'", "ur\"", "ur'", "u\"", "u'", "r\"", "r'", "UR\"",
+    "UR'", "Ur\"", "Ur'", "U\"", "U'", "uR\"", "uR'", "R\"", "R'", "\"", "'",
+];

src/docstrings/definition.rs

@@ -1,6 +1,8 @@
+use std::borrow::Cow;
+
 use rustpython_ast::{Expr, Stmt};
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub enum DefinitionKind<'a> {
     Module,
     Package,
@@ -17,6 +19,15 @@ pub struct Definition<'a> {
     pub docstring: Option<&'a Expr>,
 }
 
+#[derive(Debug)]
+pub struct Docstring<'a> {
+    pub kind: DefinitionKind<'a>,
+    pub expr: &'a Expr,
+    pub contents: &'a Cow<'a, str>,
+    pub body: &'a str,
+    pub indentation: &'a Cow<'a, str>,
+}
+
 pub enum Documentable {
     Class,
     Function,

src/docstrings/sections.rs

@@ -3,7 +3,7 @@ use crate::docstrings::styles::SectionStyle;
 
 #[derive(Debug)]
 pub(crate) struct SectionContext<'a> {
-    pub(crate) section_name: String,
+    pub(crate) section_name: &'a str,
     pub(crate) previous_line: &'a str,
     pub(crate) line: &'a str,
     pub(crate) following_lines: &'a [&'a str],
@@ -22,7 +22,7 @@ fn is_docstring_section(context: &SectionContext) -> bool {
     let section_name_suffix = context
         .line
         .trim()
-        .strip_prefix(&context.section_name)
+        .strip_prefix(context.section_name)
         .unwrap()
         .trim();
     let this_looks_like_a_section_name =

src/eradicate/detection.rs

@@ -4,7 +4,7 @@ use regex::Regex;
 
 static ALLOWLIST_REGEX: Lazy<Regex> = Lazy::new(|| {
     Regex::new(
-        r"(?i)pylint|pyright|noqa|nosec|type:\s*ignore|fmt:\s*(on|off)|isort:\s*(on|off|skip|skip_file|split|dont-add-imports(:\s*\[.*?])?)|TODO|FIXME|XXX"
+        r"^(?i)(?:pylint|pyright|noqa|nosec|type:\s*ignore|fmt:\s*(on|off)|isort:\s*(on|off|skip|skip_file|split|dont-add-imports(:\s*\[.*?])?)|TODO|FIXME|XXX)"
     ).unwrap()
 });
 static BRACKET_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^[()\[\]{}\s]+$").unwrap());

src/flake8_annotations/helpers.rs

@@ -1,5 +1,6 @@
 use rustpython_ast::{Arguments, Expr, Stmt, StmtKind};
 
+use crate::ast::cast;
 use crate::check_ast::Checker;
 use crate::docstrings::definition::{Definition, DefinitionKind};
 use crate::visibility;
@@ -32,7 +33,7 @@ pub fn overloaded_name(checker: &Checker, definition: &Definition) -> Option<Str
     | DefinitionKind::NestedFunction(stmt)
     | DefinitionKind::Method(stmt) = definition.kind
     {
-        if visibility::is_overload(checker, stmt) {
+        if visibility::is_overload(checker, cast::decorator_list(stmt)) {
             let (name, ..) = match_function_def(stmt);
             Some(name.to_string())
         } else {
@@ -50,7 +51,7 @@ pub fn is_overload_impl(checker: &Checker, definition: &Definition, overloaded_n
     | DefinitionKind::NestedFunction(stmt)
     | DefinitionKind::Method(stmt) = definition.kind
     {
-        if visibility::is_overload(checker, stmt) {
+        if visibility::is_overload(checker, cast::decorator_list(stmt)) {
             false
         } else {
             let (name, ..) = match_function_def(stmt);

src/flake8_annotations/plugins.rs

@@ -1,8 +1,8 @@
 use rustpython_ast::{Constant, Expr, ExprKind, Stmt, StmtKind};
 
 use crate::ast::types::Range;
-use crate::ast::visitor;
 use crate::ast::visitor::Visitor;
+use crate::ast::{cast, visitor};
 use crate::check_ast::Checker;
 use crate::checks::{CheckCode, CheckKind};
 use crate::docstrings::definition::{Definition, DefinitionKind};
@@ -192,7 +192,10 @@ pub fn definition(checker: &mut Checker, definition: &Definition, visibility: &V
                 .chain(args.kwonlyargs.iter())
                 .skip(
                     // If this is a non-static method, skip `cls` or `self`.
-                    usize::from(!visibility::is_staticmethod(checker, stmt)),
+                    usize::from(!visibility::is_staticmethod(
+                        checker,
+                        cast::decorator_list(stmt),
+                    )),
                 )
             {
                 // ANN401 for dynamically typed arguments
@@ -264,10 +267,10 @@ pub fn definition(checker: &mut Checker, definition: &Definition, visibility: &V
             }
 
             // ANN101, ANN102
-            if !visibility::is_staticmethod(checker, stmt) {
+            if !visibility::is_staticmethod(checker, cast::decorator_list(stmt)) {
                 if let Some(arg) = args.args.first() {
                     if arg.node.annotation.is_none() {
-                        if visibility::is_classmethod(checker, stmt) {
+                        if visibility::is_classmethod(checker, cast::decorator_list(stmt)) {
                             if checker.settings.enabled.contains(&CheckCode::ANN102) {
                                 checker.add_check(Check::new(
                                     CheckKind::MissingTypeCls(arg.node.arg.to_string()),
@@ -300,14 +303,14 @@ pub fn definition(checker: &mut Checker, definition: &Definition, visibility: &V
                     return;
                 }
 
-                if visibility::is_classmethod(checker, stmt) {
+                if visibility::is_classmethod(checker, cast::decorator_list(stmt)) {
                     if checker.settings.enabled.contains(&CheckCode::ANN206) {
                         checker.add_check(Check::new(
                             CheckKind::MissingReturnTypeClassMethod(name.to_string()),
                             Range::from_located(stmt),
                         ));
                     }
-                } else if visibility::is_staticmethod(checker, stmt) {
+                } else if visibility::is_staticmethod(checker, cast::decorator_list(stmt)) {
                     if checker.settings.enabled.contains(&CheckCode::ANN205) {
                         checker.add_check(Check::new(
                             CheckKind::MissingReturnTypeStaticMethod(name.to_string()),

src/flake8_bugbear/plugins/duplicate_exceptions.rs

@@ -1,6 +1,5 @@
-use std::collections::BTreeSet;
-
 use itertools::Itertools;
+use rustc_hash::FxHashSet;
 use rustpython_ast::{
     Excepthandler, ExcepthandlerKind, Expr, ExprContext, ExprKind, Location, Stmt,
 };
@@ -27,9 +26,9 @@ fn duplicate_handler_exceptions<'a>(
     checker: &mut Checker,
     expr: &'a Expr,
     elts: &'a [Expr],
-) -> BTreeSet<Vec<&'a str>> {
-    let mut seen: BTreeSet<Vec<&str>> = BTreeSet::default();
-    let mut duplicates: BTreeSet<Vec<&str>> = BTreeSet::default();
+) -> FxHashSet<Vec<&'a str>> {
+    let mut seen: FxHashSet<Vec<&str>> = FxHashSet::default();
+    let mut duplicates: FxHashSet<Vec<&str>> = FxHashSet::default();
     let mut unique_elts: Vec<&Expr> = Vec::default();
     for type_ in elts {
         let call_path = helpers::collect_call_paths(type_);
@@ -76,8 +75,8 @@ fn duplicate_handler_exceptions<'a>(
 }
 
 pub fn duplicate_exceptions(checker: &mut Checker, stmt: &Stmt, handlers: &[Excepthandler]) {
-    let mut seen: BTreeSet<Vec<&str>> = BTreeSet::default();
-    let mut duplicates: BTreeSet<Vec<&str>> = BTreeSet::default();
+    let mut seen: FxHashSet<Vec<&str>> = FxHashSet::default();
+    let mut duplicates: FxHashSet<Vec<&str>> = FxHashSet::default();
     for handler in handlers {
         let ExcepthandlerKind::ExceptHandler { type_: Some(type_), .. } = &handler.node else {
             continue;

src/flake8_import_conventions/checks.rs

@@ -1,5 +1,4 @@
-use std::collections::BTreeMap;
-
+use rustc_hash::FxHashMap;
 use rustpython_ast::Stmt;
 
 use crate::ast::types::Range;
@@ -10,7 +9,7 @@ pub fn check_conventional_import(
     import_from: &Stmt,
     name: &str,
     asname: Option<&str>,
-    conventions: &BTreeMap<String, String>,
+    conventions: &FxHashMap<String, String>,
 ) -> Option<Check> {
     let mut is_valid_import = true;
     if let Some(expected_alias) = conventions.get(name) {

src/flake8_import_conventions/mod.rs

@@ -3,10 +3,11 @@ pub mod settings;
 
 #[cfg(test)]
 mod tests {
-    use std::collections::BTreeMap;
+
     use std::path::Path;
 
     use anyhow::Result;
+    use rustc_hash::FxHashMap;
 
     use crate::checks::CheckCode;
     use crate::linter::test_path;
@@ -33,7 +34,7 @@ mod tests {
                     flake8_import_conventions::settings::Settings::from_options(
                         flake8_import_conventions::settings::Options {
                             aliases: None,
-                            extend_aliases: Some(BTreeMap::from([
+                            extend_aliases: Some(FxHashMap::from_iter([
                                 ("dask.array".to_string(), "da".to_string()),
                                 ("dask.dataframe".to_string(), "dd".to_string()),
                             ])),
@@ -56,7 +57,7 @@ mod tests {
                 flake8_import_conventions:
                     flake8_import_conventions::settings::Settings::from_options(
                         flake8_import_conventions::settings::Options {
-                            aliases: Some(BTreeMap::from([
+                            aliases: Some(FxHashMap::from_iter([
                                 ("altair".to_string(), "alt".to_string()),
                                 ("matplotlib.pyplot".to_string(), "plt".to_string()),
                                 ("pandas".to_string(), "pd".to_string()),
@@ -83,7 +84,7 @@ mod tests {
                     flake8_import_conventions::settings::Settings::from_options(
                         flake8_import_conventions::settings::Options {
                             aliases: None,
-                            extend_aliases: Some(BTreeMap::from([(
+                            extend_aliases: Some(FxHashMap::from_iter([(
                                 "numpy".to_string(),
                                 "nmp".to_string(),
                             )])),

src/flake8_import_conventions/settings.rs

@@ -1,8 +1,10 @@
 //! Settings for import conventions.
 
-use std::collections::BTreeMap;
+use std::hash::{Hash, Hasher};
 
+use itertools::Itertools;
 use ruff_macros::ConfigurationOptions;
+use rustc_hash::FxHashMap;
 use serde::{Deserialize, Serialize};
 
 const CONVENTIONAL_ALIASES: &[(&str, &str)] = &[
@@ -20,7 +22,7 @@ pub struct Options {
         doc = "The conventional aliases for imports. These aliases can be extended by the \
                `extend_aliases` option.",
         default = r#"{"altair": "alt", "matplotlib.pyplot": "plt", "numpy": "np", "pandas": "pd", "seaborn": "sns"}"#,
-        value_type = "BTreeMap<String, String>",
+        value_type = "FxHashMap<String, String>",
         example = r#"
             # Declare the default aliases.
             altair = "alt"
@@ -30,33 +32,41 @@ pub struct Options {
             seaborn = "sns"
         "#
     )]
-    pub aliases: Option<BTreeMap<String, String>>,
+    pub aliases: Option<FxHashMap<String, String>>,
     #[option(
         doc = "A mapping of modules to their conventional import aliases. These aliases will be \
                added to the `aliases` mapping.",
         default = r#"{}"#,
-        value_type = "BTreeMap<String, String>",
+        value_type = "FxHashMap<String, String>",
         example = r#"
             # Declare a custom alias for the `matplotlib` module.
             "dask.dataframe" = "dd"
         "#
     )]
-    pub extend_aliases: Option<BTreeMap<String, String>>,
+    pub extend_aliases: Option<FxHashMap<String, String>>,
 }
 
-#[derive(Debug, Hash)]
+#[derive(Debug)]
 pub struct Settings {
-    pub aliases: BTreeMap<String, String>,
+    pub aliases: FxHashMap<String, String>,
 }
 
-fn default_aliases() -> BTreeMap<String, String> {
+impl Hash for Settings {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        for value in self.aliases.iter().sorted() {
+            value.hash(state);
+        }
+    }
+}
+
+fn default_aliases() -> FxHashMap<String, String> {
     CONVENTIONAL_ALIASES
         .iter()
         .map(|(k, v)| ((*k).to_string(), (*v).to_string()))
-        .collect::<BTreeMap<_, _>>()
+        .collect::<FxHashMap<_, _>>()
 }
 
-fn resolve_aliases(options: Options) -> BTreeMap<String, String> {
+fn resolve_aliases(options: Options) -> FxHashMap<String, String> {
     let mut aliases = match options.aliases {
         Some(options_aliases) => options_aliases,
         None => default_aliases(),

src/flake8_print/plugins/print_call.rs

@@ -19,24 +19,14 @@ pub fn print_call(checker: &mut Checker, expr: &Expr, func: &Expr) {
     };
 
     if checker.patch(check.kind.code()) {
-        let context = checker.binding_context();
-        if matches!(
-            checker.parents[context.defined_by].node,
-            StmtKind::Expr { .. }
-        ) {
-            let deleted: Vec<&Stmt> = checker
-                .deletions
-                .iter()
-                .map(|index| checker.parents[*index])
-                .collect();
-            match helpers::remove_stmt(
-                checker.parents[context.defined_by],
-                context.defined_in.map(|index| checker.parents[index]),
-                &deleted,
-            ) {
+        let defined_by = checker.current_parent();
+        let defined_in = checker.current_grandparent();
+        if matches!(defined_by.0.node, StmtKind::Expr { .. }) {
+            let deleted: Vec<&Stmt> = checker.deletions.iter().map(|node| node.0).collect();
+            match helpers::remove_stmt(defined_by.0, defined_in.map(|node| node.0), &deleted) {
                 Ok(fix) => {
                     if fix.content.is_empty() || fix.content == "pass" {
-                        checker.deletions.insert(context.defined_by);
+                        checker.deletions.insert(defined_by.clone());
                     }
                     check.amend(fix);
                 }

src/flake8_return/visitor.rs

@@ -18,6 +18,8 @@ pub struct Stack<'a> {
 #[derive(Default)]
 pub struct ReturnVisitor<'a> {
     pub stack: Stack<'a>,
+    // If we're in an f-string, the location of the defining expression.
+    in_f_string: Option<Location>,
 }
 
 impl<'a> ReturnVisitor<'a> {
@@ -34,7 +36,7 @@ impl<'a> ReturnVisitor<'a> {
                     .assigns
                     .entry(id)
                     .or_insert_with(Vec::new)
-                    .push(expr.location);
+                    .push(self.in_f_string.unwrap_or(expr.location));
                 return;
             }
             _ => {}
@@ -70,7 +72,7 @@ impl<'a> Visitor<'a> for ReturnVisitor<'a> {
                         .refs
                         .entry(id)
                         .or_insert_with(Vec::new)
-                        .push(value.location);
+                        .push(self.in_f_string.unwrap_or(value.location));
                 }
 
                 visitor::walk_expr(self, value);
@@ -111,7 +113,13 @@ impl<'a> Visitor<'a> for ReturnVisitor<'a> {
                     .refs
                     .entry(id)
                     .or_insert_with(Vec::new)
-                    .push(expr.location);
+                    .push(self.in_f_string.unwrap_or(expr.location));
+            }
+            ExprKind::JoinedStr { .. } => {
+                let prev_in_f_string = self.in_f_string;
+                self.in_f_string = Some(expr.location);
+                visitor::walk_expr(self, expr);
+                self.in_f_string = prev_in_f_string;
             }
             _ => visitor::walk_expr(self, expr),
         }

src/flake8_tidy_imports/mod.rs

@@ -15,12 +15,12 @@ mod tests {
     #[test]
     fn ban_parent_imports() -> Result<()> {
         let mut checks = test_path(
-            Path::new("./resources/test/fixtures/flake8_tidy_imports/I252.py"),
+            Path::new("./resources/test/fixtures/flake8_tidy_imports/TID252.py"),
             &Settings {
                 flake8_tidy_imports: flake8_tidy_imports::settings::Settings {
                     ban_relative_imports: Strictness::Parents,
                 },
-                ..Settings::for_rules(vec![CheckCode::I252])
+                ..Settings::for_rules(vec![CheckCode::TID252])
             },
             true,
         )?;
@@ -32,12 +32,12 @@ mod tests {
     #[test]
     fn ban_all_imports() -> Result<()> {
         let mut checks = test_path(
-            Path::new("./resources/test/fixtures/flake8_tidy_imports/I252.py"),
+            Path::new("./resources/test/fixtures/flake8_tidy_imports/TID252.py"),
             &Settings {
                 flake8_tidy_imports: flake8_tidy_imports::settings::Settings {
                     ban_relative_imports: Strictness::All,
                 },
-                ..Settings::for_rules(vec![CheckCode::I252])
+                ..Settings::for_rules(vec![CheckCode::TID252])
             },
             true,
         )?;

src/flake8_unused_arguments/helpers.rs

@@ -0,0 +1,19 @@
+use rustpython_ast::{Constant, ExprKind, Stmt, StmtKind};
+
+pub fn is_empty(body: &[Stmt]) -> bool {
+    match &body {
+        [] => true,
+        // Also allow: raise NotImplementedError, raise NotImplemented
+        [stmt] => match &stmt.node {
+            StmtKind::Pass => true,
+            StmtKind::Expr { value } => match &value.node {
+                ExprKind::Constant { value, .. } => {
+                    matches!(value, Constant::Str(_) | Constant::Ellipsis)
+                }
+                _ => false,
+            },
+            _ => false,
+        },
+        _ => false,
+    }
+}

src/flake8_unused_arguments/mod.rs

@@ -0,0 +1,35 @@
+mod helpers;
+pub mod plugins;
+mod types;
+
+#[cfg(test)]
+mod tests {
+    use std::convert::AsRef;
+    use std::path::Path;
+
+    use anyhow::Result;
+    use test_case::test_case;
+
+    use crate::checks::CheckCode;
+    use crate::linter::test_path;
+    use crate::settings;
+
+    #[test_case(CheckCode::ARG001, Path::new("ARG.py"); "ARG001")]
+    #[test_case(CheckCode::ARG002, Path::new("ARG.py"); "ARG002")]
+    #[test_case(CheckCode::ARG003, Path::new("ARG.py"); "ARG003")]
+    #[test_case(CheckCode::ARG004, Path::new("ARG.py"); "ARG004")]
+    #[test_case(CheckCode::ARG005, Path::new("ARG.py"); "ARG005")]
+    fn checks(check_code: CheckCode, path: &Path) -> Result<()> {
+        let snapshot = format!("{}_{}", check_code.as_ref(), path.to_string_lossy());
+        let mut checks = test_path(
+            Path::new("./resources/test/fixtures/flake8_unused_arguments")
+                .join(path)
+                .as_path(),
+            &settings::Settings::for_rule(check_code),
+            true,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+}

src/flake8_unused_arguments/plugins.rs

@@ -0,0 +1,199 @@
+use std::iter;
+
+use regex::Regex;
+use rustc_hash::FxHashMap;
+use rustpython_ast::{Arg, Arguments};
+
+use crate::ast::function_type;
+use crate::ast::function_type::FunctionType;
+use crate::ast::helpers::collect_arg_names;
+use crate::ast::types::{Binding, BindingKind, FunctionDef, Lambda, Scope, ScopeKind};
+use crate::check_ast::Checker;
+use crate::flake8_unused_arguments::helpers;
+use crate::flake8_unused_arguments::types::Argumentable;
+use crate::{visibility, Check};
+
+/// Check a plain function for unused arguments.
+fn function(
+    argumentable: &Argumentable,
+    args: &Arguments,
+    values: &FxHashMap<&str, usize>,
+    bindings: &[Binding],
+    dummy_variable_rgx: &Regex,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+    for arg_name in collect_arg_names(args) {
+        if let Some(binding) = values.get(arg_name).map(|index| &bindings[*index]) {
+            if binding.used.is_none()
+                && matches!(binding.kind, BindingKind::Argument)
+                && !dummy_variable_rgx.is_match(arg_name)
+            {
+                checks.push(Check::new(
+                    argumentable.check_for(arg_name.to_string()),
+                    binding.range,
+                ));
+            }
+        }
+    }
+    checks
+}
+
+/// Check a method for unused arguments.
+fn method(
+    argumentable: &Argumentable,
+    args: &Arguments,
+    values: &FxHashMap<&str, usize>,
+    bindings: &[Binding],
+    dummy_variable_rgx: &Regex,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+    for arg in args
+        .posonlyargs
+        .iter()
+        .chain(args.args.iter())
+        .skip(1)
+        .chain(args.kwonlyargs.iter())
+        .chain(iter::once::<Option<&Arg>>(args.vararg.as_deref()).flatten())
+        .chain(iter::once::<Option<&Arg>>(args.kwarg.as_deref()).flatten())
+    {
+        if let Some(binding) = values
+            .get(&arg.node.arg.as_str())
+            .map(|index| &bindings[*index])
+        {
+            if binding.used.is_none()
+                && matches!(binding.kind, BindingKind::Argument)
+                && !dummy_variable_rgx.is_match(arg.node.arg.as_str())
+            {
+                checks.push(Check::new(
+                    argumentable.check_for(arg.node.arg.to_string()),
+                    binding.range,
+                ));
+            }
+        }
+    }
+    checks
+}
+
+/// ARG001, ARG002, ARG003, ARG004, ARG005
+pub fn unused_arguments(
+    checker: &Checker,
+    parent: &Scope,
+    scope: &Scope,
+    bindings: &[Binding],
+) -> Vec<Check> {
+    match &scope.kind {
+        ScopeKind::Function(FunctionDef {
+            name,
+            args,
+            body,
+            decorator_list,
+            ..
+        }) => {
+            match function_type::classify(
+                parent,
+                name,
+                decorator_list,
+                &checker.from_imports,
+                &checker.import_aliases,
+                &checker.settings.pep8_naming.classmethod_decorators,
+                &checker.settings.pep8_naming.staticmethod_decorators,
+            ) {
+                FunctionType::Function => {
+                    if checker
+                        .settings
+                        .enabled
+                        .contains(Argumentable::Function.check_code())
+                    {
+                        function(
+                            &Argumentable::Function,
+                            args,
+                            &scope.values,
+                            bindings,
+                            &checker.settings.dummy_variable_rgx,
+                        )
+                    } else {
+                        vec![]
+                    }
+                }
+                FunctionType::Method => {
+                    if checker
+                        .settings
+                        .enabled
+                        .contains(Argumentable::Method.check_code())
+                        && !helpers::is_empty(body)
+                        && !visibility::is_abstract(checker, decorator_list)
+                        && !visibility::is_override(checker, decorator_list)
+                    {
+                        method(
+                            &Argumentable::Method,
+                            args,
+                            &scope.values,
+                            bindings,
+                            &checker.settings.dummy_variable_rgx,
+                        )
+                    } else {
+                        vec![]
+                    }
+                }
+                FunctionType::ClassMethod => {
+                    if checker
+                        .settings
+                        .enabled
+                        .contains(Argumentable::ClassMethod.check_code())
+                        && !helpers::is_empty(body)
+                        && !visibility::is_abstract(checker, decorator_list)
+                        && !visibility::is_override(checker, decorator_list)
+                    {
+                        method(
+                            &Argumentable::ClassMethod,
+                            args,
+                            &scope.values,
+                            bindings,
+                            &checker.settings.dummy_variable_rgx,
+                        )
+                    } else {
+                        vec![]
+                    }
+                }
+                FunctionType::StaticMethod => {
+                    if checker
+                        .settings
+                        .enabled
+                        .contains(Argumentable::StaticMethod.check_code())
+                        && !helpers::is_empty(body)
+                        && !visibility::is_abstract(checker, decorator_list)
+                        && !visibility::is_override(checker, decorator_list)
+                    {
+                        function(
+                            &Argumentable::StaticMethod,
+                            args,
+                            &scope.values,
+                            bindings,
+                            &checker.settings.dummy_variable_rgx,
+                        )
+                    } else {
+                        vec![]
+                    }
+                }
+            }
+        }
+        ScopeKind::Lambda(Lambda { args, .. }) => {
+            if checker
+                .settings
+                .enabled
+                .contains(Argumentable::Lambda.check_code())
+            {
+                function(
+                    &Argumentable::Lambda,
+                    args,
+                    &scope.values,
+                    bindings,
+                    &checker.settings.dummy_variable_rgx,
+                )
+            } else {
+                vec![]
+            }
+        }
+        _ => unreachable!("Expected ScopeKind::Function | ScopeKind::Lambda"),
+    }
+}

src/flake8_unused_arguments/snapshots/ruff__flake8_unused_arguments__tests__ARG001_ARG.py.snap

@@ -0,0 +1,77 @@
+---
+source: src/flake8_unused_arguments/mod.rs
+expression: checks
+---
+- kind:
+    UnusedFunctionArgument: self
+  location:
+    row: 8
+    column: 6
+  end_location:
+    row: 8
+    column: 10
+  fix: ~
+- kind:
+    UnusedFunctionArgument: x
+  location:
+    row: 8
+    column: 12
+  end_location:
+    row: 8
+    column: 13
+  fix: ~
+- kind:
+    UnusedFunctionArgument: cls
+  location:
+    row: 12
+    column: 6
+  end_location:
+    row: 12
+    column: 9
+  fix: ~
+- kind:
+    UnusedFunctionArgument: x
+  location:
+    row: 12
+    column: 11
+  end_location:
+    row: 12
+    column: 12
+  fix: ~
+- kind:
+    UnusedFunctionArgument: self
+  location:
+    row: 16
+    column: 6
+  end_location:
+    row: 16
+    column: 10
+  fix: ~
+- kind:
+    UnusedFunctionArgument: x
+  location:
+    row: 16
+    column: 12
+  end_location:
+    row: 16
+    column: 13
+  fix: ~
+- kind:
+    UnusedFunctionArgument: cls
+  location:
+    row: 20
+    column: 6
+  end_location:
+    row: 20
+    column: 9
+  fix: ~
+- kind:
+    UnusedFunctionArgument: x
+  location:
+    row: 20
+    column: 11
+  end_location:
+    row: 20
+    column: 12
+  fix: ~
+

src/flake8_unused_arguments/snapshots/ruff__flake8_unused_arguments__tests__ARG002_ARG.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_unused_arguments/mod.rs
+expression: checks
+---
+- kind:
+    UnusedMethodArgument: x
+  location:
+    row: 34
+    column: 16
+  end_location:
+    row: 34
+    column: 17
+  fix: ~
+- kind:
+    UnusedMethodArgument: x
+  location:
+    row: 37
+    column: 19
+  end_location:
+    row: 37
+    column: 20
+  fix: ~
+- kind:
+    UnusedMethodArgument: x
+  location:
+    row: 40
+    column: 15
+  end_location:
+    row: 40
+    column: 16
+  fix: ~
+

src/flake8_unused_arguments/snapshots/ruff__flake8_unused_arguments__tests__ARG003_ARG.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_unused_arguments/mod.rs
+expression: checks
+---
+- kind:
+    UnusedClassMethodArgument: x
+  location:
+    row: 44
+    column: 15
+  end_location:
+    row: 44
+    column: 16
+  fix: ~
+

src/flake8_unused_arguments/snapshots/ruff__flake8_unused_arguments__tests__ARG004_ARG.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_unused_arguments/mod.rs
+expression: checks
+---
+- kind:
+    UnusedStaticMethodArgument: cls
+  location:
+    row: 48
+    column: 10
+  end_location:
+    row: 48
+    column: 13
+  fix: ~
+- kind:
+    UnusedStaticMethodArgument: x
+  location:
+    row: 48
+    column: 15
+  end_location:
+    row: 48
+    column: 16
+  fix: ~
+- kind:
+    UnusedStaticMethodArgument: x
+  location:
+    row: 52
+    column: 10
+  end_location:
+    row: 52
+    column: 11
+  fix: ~
+

src/flake8_unused_arguments/snapshots/ruff__flake8_unused_arguments__tests__ARG005_ARG.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_unused_arguments/mod.rs
+expression: checks
+---
+- kind:
+    UnusedLambdaArgument: x
+  location:
+    row: 27
+    column: 7
+  end_location:
+    row: 27
+    column: 8
+  fix: ~
+

src/flake8_unused_arguments/types.rs

@@ -0,0 +1,32 @@
+use crate::checks::{CheckCode, CheckKind};
+
+/// An AST node that can contain arguments.
+pub enum Argumentable {
+    Function,
+    Method,
+    ClassMethod,
+    StaticMethod,
+    Lambda,
+}
+
+impl Argumentable {
+    pub fn check_for(&self, name: String) -> CheckKind {
+        match self {
+            Argumentable::Function => CheckKind::UnusedFunctionArgument(name),
+            Argumentable::Method => CheckKind::UnusedMethodArgument(name),
+            Argumentable::ClassMethod => CheckKind::UnusedClassMethodArgument(name),
+            Argumentable::StaticMethod => CheckKind::UnusedStaticMethodArgument(name),
+            Argumentable::Lambda => CheckKind::UnusedLambdaArgument(name),
+        }
+    }
+
+    pub fn check_code(&self) -> &CheckCode {
+        match self {
+            Argumentable::Function => &CheckCode::ARG001,
+            Argumentable::Method => &CheckCode::ARG002,
+            Argumentable::ClassMethod => &CheckCode::ARG003,
+            Argumentable::StaticMethod => &CheckCode::ARG004,
+            Argumentable::Lambda => &CheckCode::ARG005,
+        }
+    }
+}

src/fs.rs

@@ -1,5 +1,4 @@
 use std::borrow::Cow;
-use std::collections::BTreeSet;
 use std::fs::File;
 use std::io::{BufReader, Read};
 use std::path::{Path, PathBuf};
@@ -8,6 +7,7 @@ use anyhow::{anyhow, Result};
 use globset::GlobMatcher;
 use log::debug;
 use path_absolutize::{path_dedot, Absolutize};
+use rustc_hash::FxHashSet;
 use walkdir::{DirEntry, WalkDir};
 
 use crate::checks::CheckCode;
@@ -83,8 +83,8 @@ pub fn iter_python_files<'a>(
 /// Create tree set with codes matching the pattern/code pairs.
 pub(crate) fn ignores_from_path<'a>(
     path: &Path,
-    pattern_code_pairs: &'a [(GlobMatcher, GlobMatcher, BTreeSet<CheckCode>)],
-) -> Result<BTreeSet<&'a CheckCode>> {
+    pattern_code_pairs: &'a [(GlobMatcher, GlobMatcher, FxHashSet<CheckCode>)],
+) -> Result<FxHashSet<&'a CheckCode>> {
     let (file_path, file_basename) = extract_path_names(path)?;
     Ok(pattern_code_pairs
         .iter()

src/isort/mod.rs

@@ -559,6 +559,7 @@ mod tests {
     #[test_case(Path::new("force_wrap_aliases.py"))]
     #[test_case(Path::new("import_from_after_import.py"))]
     #[test_case(Path::new("insert_empty_lines.py"))]
+    #[test_case(Path::new("insert_empty_lines.pyi"))]
     #[test_case(Path::new("leading_prefix.py"))]
     #[test_case(Path::new("no_reorder_within_section.py"))]
     #[test_case(Path::new("no_wrap_star.py"))]

src/isort/plugins.rs

@@ -19,14 +19,12 @@ fn extract_range(body: &[&Stmt]) -> Range {
     }
 }
 
-fn extract_indentation(body: &[&Stmt], locator: &SourceCodeLocator) -> String {
+fn extract_indentation_range(body: &[&Stmt]) -> Range {
     let location = body.first().unwrap().location;
-    let range = Range {
+    Range {
         location: Location::new(location.row(), 0),
         end_location: location,
-    };
-    let existing = locator.slice_source_code_range(&range);
-    leading_space(&existing)
+    }
 }
 
 /// I001
@@ -36,8 +34,10 @@ pub fn check_imports(
     settings: &Settings,
     autofix: bool,
 ) -> Option<Check> {
+    let indentation = locator.slice_source_code_range(&extract_indentation_range(&block.imports));
+    let indentation = leading_space(&indentation);
+
     let range = extract_range(&block.imports);
-    let indentation = extract_indentation(&block.imports, locator);
 
     // Extract comments. Take care to grab any inline comments from the last line.
     let comments = comments::collect_comments(
@@ -77,7 +77,7 @@ pub fn check_imports(
             if has_leading_content {
                 content.push('\n');
             }
-            content.push_str(&indent(&expected, &indentation));
+            content.push_str(&indent(&expected, indentation));
             check.amend(Fix::replacement(
                 content,
                 // Preserve leading prefix (but put the imports on a new line).
@@ -104,7 +104,7 @@ pub fn check_imports(
             let mut check = Check::new(CheckKind::UnsortedImports, range);
             if autofix && settings.fixable.contains(check.kind.code()) {
                 check.amend(Fix::replacement(
-                    indent(&expected, &indentation),
+                    indent(&expected, indentation),
                     range.location,
                     range.end_location,
                 ));

src/isort/settings.rs

@@ -32,11 +32,16 @@ pub struct Options {
                 test_id as test_id
             )
             ```
+
+            Note that this setting is only effective when combined with `combine-as-imports = true`.
+            When `combine-as-imports` isn't enabled, every aliased `import from` will be given its
+            own line, in which case, wrapping is not necessary.
         "#,
         default = r#"false"#,
         value_type = "bool",
         example = r#"
             force-wrap-aliases = true
+            combine-as-imports = true
         "#
     )]
     pub force_wrap_aliases: Option<bool>,

src/isort/snapshots/ruff__isort__tests__insert_empty_lines.pyi.snap

@@ -0,0 +1,65 @@
+---
+source: src/isort/mod.rs
+expression: checks
+---
+- kind: UnsortedImports
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 0
+  fix:
+    content: "import a\nimport b\n\n"
+    location:
+      row: 1
+      column: 0
+    end_location:
+      row: 3
+      column: 0
+- kind: UnsortedImports
+  location:
+    row: 4
+    column: 0
+  end_location:
+    row: 6
+    column: 0
+  fix:
+    content: "import os\nimport sys\n\n"
+    location:
+      row: 4
+      column: 0
+    end_location:
+      row: 6
+      column: 0
+- kind: UnsortedImports
+  location:
+    row: 14
+    column: 0
+  end_location:
+    row: 16
+    column: 0
+  fix:
+    content: "import os\nimport sys\n\n"
+    location:
+      row: 14
+      column: 0
+    end_location:
+      row: 16
+      column: 0
+- kind: UnsortedImports
+  location:
+    row: 33
+    column: 0
+  end_location:
+    row: 35
+    column: 0
+  fix:
+    content: "    import collections\n    import typing\n\n"
+    location:
+      row: 33
+      column: 0
+    end_location:
+      row: 35
+      column: 0
+

src/isort/track.rs

@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use rustpython_ast::{
     Alias, Arg, Arguments, Boolop, Cmpop, Comprehension, Constant, Excepthandler,
     ExcepthandlerKind, Expr, ExprContext, Keyword, MatchCase, Operator, Pattern, Stmt, StmtKind,
@@ -20,16 +22,18 @@ pub struct Block<'a> {
 }
 
 pub struct ImportTracker<'a> {
-    blocks: Vec<Block<'a>>,
     directives: &'a IsortDirectives,
+    pyi: bool,
+    blocks: Vec<Block<'a>>,
     split_index: usize,
     nested: bool,
 }
 
 impl<'a> ImportTracker<'a> {
-    pub fn new(directives: &'a IsortDirectives) -> Self {
+    pub fn new(directives: &'a IsortDirectives, path: &'a Path) -> Self {
         Self {
             directives,
+            pyi: path.extension().map_or(false, |ext| ext == "pyi"),
             blocks: vec![Block::default()],
             split_index: 0,
             nested: false,
@@ -41,6 +45,34 @@ impl<'a> ImportTracker<'a> {
         self.blocks[index].imports.push(stmt);
     }
 
+    fn trailer_for(&self, stmt: &'a Stmt) -> Option<Trailer> {
+        if self.pyi {
+            // Black treats interface files differently, limiting to one newline
+            // (`Trailing::Sibling`), and avoiding inserting any newlines in nested function
+            // blocks.
+            if self.nested
+                && matches!(
+                    stmt.node,
+                    StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. }
+                )
+            {
+                None
+            } else {
+                Some(Trailer::Sibling)
+            }
+        } else if self.nested {
+            Some(Trailer::Sibling)
+        } else {
+            Some(match &stmt.node {
+                StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. } => {
+                    Trailer::FunctionDef
+                }
+                StmtKind::ClassDef { .. } => Trailer::ClassDef,
+                _ => Trailer::Sibling,
+            })
+        }
+    }
+
     fn finalize(&mut self, trailer: Option<Trailer>) {
         let index = self.blocks.len() - 1;
         if !self.blocks[index].imports.is_empty() {
@@ -62,17 +94,7 @@ where
         // Track manual splits.
         while self.split_index < self.directives.splits.len() {
             if stmt.location.row() >= self.directives.splits[self.split_index] {
-                self.finalize(Some(if self.nested {
-                    Trailer::Sibling
-                } else {
-                    match &stmt.node {
-                        StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. } => {
-                            Trailer::FunctionDef
-                        }
-                        StmtKind::ClassDef { .. } => Trailer::ClassDef,
-                        _ => Trailer::Sibling,
-                    }
-                }));
+                self.finalize(self.trailer_for(stmt));
                 self.split_index += 1;
             } else {
                 break;
@@ -87,17 +109,7 @@ where
         {
             self.track_import(stmt);
         } else {
-            self.finalize(Some(if self.nested {
-                Trailer::Sibling
-            } else {
-                match &stmt.node {
-                    StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. } => {
-                        Trailer::FunctionDef
-                    }
-                    StmtKind::ClassDef { .. } => Trailer::ClassDef,
-                    _ => Trailer::Sibling,
-                }
-            }));
+            self.finalize(self.trailer_for(stmt));
         }
 
         // Track scope.

src/lib.rs

@@ -54,6 +54,7 @@ mod flake8_print;
 pub mod flake8_quotes;
 mod flake8_return;
 pub mod flake8_tidy_imports;
+mod flake8_unused_arguments;
 pub mod fs;
 mod isort;
 mod lex;

src/linter.rs

@@ -92,6 +92,7 @@ pub(crate) fn check_path(
                         &directives.isort,
                         settings,
                         autofix,
+                        path,
                     ));
                 }
             }
@@ -133,7 +134,7 @@ pub(crate) fn check_path(
     Ok(checks)
 }
 
-const MAX_ITERATIONS: usize = 1;
+const MAX_ITERATIONS: usize = 100;
 
 /// Lint the source code at the given `Path`.
 pub fn lint_path(

src/main.rs

@@ -392,7 +392,7 @@ fn inner_main() -> Result<ExitCode> {
         // unless we're writing fixes via stdin (in which case, the transformed
         // source code goes to stdout).
         if !(is_stdin && matches!(autofix, fixer::Mode::Apply)) {
-            printer.write_once(&diagnostics)?;
+            printer.write_once(&diagnostics, &autofix)?;
         }
 
         // Check for updates if we're in a non-silent log level.

src/noqa.rs

@@ -1,4 +1,3 @@
-use std::collections::{BTreeMap, BTreeSet};
 use std::fs;
 use std::path::Path;
 
@@ -7,8 +6,9 @@ use itertools::Itertools;
 use nohash_hasher::IntMap;
 use once_cell::sync::Lazy;
 use regex::Regex;
+use rustc_hash::{FxHashMap, FxHashSet};
 
-use crate::checks::{Check, CheckCode, REDIRECTS};
+use crate::checks::{Check, CheckCode, CODE_REDIRECTS};
 
 static NO_QA_LINE_REGEX: Lazy<Regex> = Lazy::new(|| {
     Regex::new(
@@ -70,7 +70,7 @@ pub fn extract_noqa_directive(line: &str) -> Directive {
 pub fn includes(needle: &CheckCode, haystack: &[&str]) -> bool {
     let needle: &str = needle.as_ref();
     haystack.iter().any(|candidate| {
-        if let Some(candidate) = REDIRECTS.get(candidate) {
+        if let Some(candidate) = CODE_REDIRECTS.get(candidate) {
             needle == candidate.as_ref()
         } else {
             &needle == candidate
@@ -83,7 +83,7 @@ pub fn add_noqa(
     checks: &[Check],
     contents: &str,
     noqa_line_for: &IntMap<usize, usize>,
-    external: &BTreeSet<String>,
+    external: &FxHashSet<String>,
 ) -> Result<usize> {
     let (count, output) = add_noqa_inner(checks, contents, noqa_line_for, external);
     fs::write(path, output)?;
@@ -94,16 +94,16 @@ fn add_noqa_inner(
     checks: &[Check],
     contents: &str,
     noqa_line_for: &IntMap<usize, usize>,
-    external: &BTreeSet<String>,
+    external: &FxHashSet<String>,
 ) -> (usize, String) {
-    let mut matches_by_line: BTreeMap<usize, BTreeSet<&CheckCode>> = BTreeMap::new();
+    let mut matches_by_line: FxHashMap<usize, FxHashSet<&CheckCode>> = FxHashMap::default();
     for (lineno, line) in contents.lines().enumerate() {
         // If we hit an exemption for the entire file, bail.
         if is_file_exempt(line) {
             return (0, contents.to_string());
         }
 
-        let mut codes: BTreeSet<&CheckCode> = BTreeSet::new();
+        let mut codes: FxHashSet<&CheckCode> = FxHashSet::default();
         for check in checks {
             if check.location.row() == lineno + 1 {
                 codes.insert(check.kind.code());
@@ -117,7 +117,7 @@ fn add_noqa_inner(
 
         if !codes.is_empty() {
             let matches = matches_by_line.entry(noqa_lineno).or_default();
-            matches.append(&mut codes);
+            matches.extend(codes);
         }
     }
 
@@ -199,9 +199,9 @@ fn add_noqa_inner(
 
 #[cfg(test)]
 mod tests {
-    use std::collections::BTreeSet;
 
     use nohash_hasher::IntMap;
+    use rustc_hash::FxHashSet;
     use rustpython_parser::ast::Location;
 
     use crate::ast::types::Range;
@@ -227,7 +227,7 @@ mod tests {
         let checks = vec![];
         let contents = "x = 1";
         let noqa_line_for = IntMap::default();
-        let external = BTreeSet::default();
+        let external = FxHashSet::default();
         let (count, output) = add_noqa_inner(&checks, contents, &noqa_line_for, &external);
         assert_eq!(count, 0);
         assert_eq!(output.trim(), contents.trim());
@@ -241,7 +241,7 @@ mod tests {
         )];
         let contents = "x = 1";
         let noqa_line_for = IntMap::default();
-        let external = BTreeSet::default();
+        let external = FxHashSet::default();
         let (count, output) = add_noqa_inner(&checks, contents, &noqa_line_for, &external);
         assert_eq!(count, 1);
         assert_eq!(output.trim(), "x = 1  # noqa: F841".trim());
@@ -264,7 +264,7 @@ mod tests {
         ];
         let contents = "x = 1  # noqa: E741";
         let noqa_line_for = IntMap::default();
-        let external = BTreeSet::default();
+        let external = FxHashSet::default();
         let (count, output) = add_noqa_inner(&checks, contents, &noqa_line_for, &external);
         assert_eq!(count, 1);
         assert_eq!(output.trim(), "x = 1  # noqa: E741, F841".trim());
@@ -287,7 +287,7 @@ mod tests {
         ];
         let contents = "x = 1  # noqa";
         let noqa_line_for = IntMap::default();
-        let external = BTreeSet::default();
+        let external = FxHashSet::default();
         let (count, output) = add_noqa_inner(&checks, contents, &noqa_line_for, &external);
         assert_eq!(count, 1);
         assert_eq!(output.trim(), "x = 1  # noqa: E741, F841".trim());

src/pep8_naming/checks.rs

@@ -1,10 +1,10 @@
 use rustc_hash::{FxHashMap, FxHashSet};
 use rustpython_ast::{Arguments, Expr, ExprKind, Stmt};
 
+use crate::ast::function_type;
 use crate::ast::types::{Range, Scope, ScopeKind};
 use crate::checks::{Check, CheckKind};
 use crate::pep8_naming::helpers;
-use crate::pep8_naming::helpers::FunctionType;
 use crate::pep8_naming::settings::Settings;
 use crate::python::string::{self};
 
@@ -58,15 +58,16 @@ pub fn invalid_first_argument_name_for_class_method(
     settings: &Settings,
 ) -> Option<Check> {
     if !matches!(
-        helpers::function_type(
+        function_type::classify(
             scope,
             name,
             decorator_list,
             from_imports,
             import_aliases,
-            settings,
+            &settings.classmethod_decorators,
+            &settings.staticmethod_decorators,
         ),
-        FunctionType::ClassMethod
+        function_type::FunctionType::ClassMethod
     ) {
         return None;
     }
@@ -99,15 +100,16 @@ pub fn invalid_first_argument_name_for_method(
     settings: &Settings,
 ) -> Option<Check> {
     if !matches!(
-        helpers::function_type(
+        function_type::classify(
             scope,
             name,
             decorator_list,
             from_imports,
             import_aliases,
-            settings,
+            &settings.classmethod_decorators,
+            &settings.staticmethod_decorators,
         ),
-        FunctionType::Method
+        function_type::FunctionType::Method
     ) {
         return None;
     }

src/pep8_naming/helpers.rs

@@ -1,71 +1,10 @@
 use itertools::Itertools;
 use rustc_hash::{FxHashMap, FxHashSet};
-use rustpython_ast::{Expr, Stmt, StmtKind};
+use rustpython_ast::{Stmt, StmtKind};
 
-use crate::ast::helpers::{
-    collect_call_paths, dealias_call_path, match_call_path, to_module_and_member,
-};
-use crate::ast::types::{Scope, ScopeKind};
-use crate::pep8_naming::settings::Settings;
+use crate::ast::helpers::{collect_call_paths, match_call_path};
 use crate::python::string::{is_lower, is_upper};
 
-const CLASS_METHODS: [&str; 3] = ["__new__", "__init_subclass__", "__class_getitem__"];
-const METACLASS_BASES: [(&str, &str); 2] = [("", "type"), ("abc", "ABCMeta")];
-
-pub enum FunctionType {
-    Function,
-    Method,
-    ClassMethod,
-    StaticMethod,
-}
-
-/// Classify a function based on its scope, name, and decorators.
-pub fn function_type(
-    scope: &Scope,
-    name: &str,
-    decorator_list: &[Expr],
-    from_imports: &FxHashMap<&str, FxHashSet<&str>>,
-    import_aliases: &FxHashMap<&str, &str>,
-    settings: &Settings,
-) -> FunctionType {
-    let ScopeKind::Class(scope) = &scope.kind else {
-        return FunctionType::Function;
-    };
-    // Special-case class method, like `__new__`.
-    if CLASS_METHODS.contains(&name)
-        || scope.bases.iter().any(|expr| {
-            // The class itself extends a known metaclass, so all methods are class methods.
-            let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
-            METACLASS_BASES
-                .iter()
-                .any(|(module, member)| match_call_path(&call_path, module, member, from_imports))
-        })
-        || decorator_list.iter().any(|expr| {
-            // The method is decorated with a class method decorator (like `@classmethod`).
-            let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
-            settings.classmethod_decorators.iter().any(|decorator| {
-                let (module, member) = to_module_and_member(decorator);
-                match_call_path(&call_path, module, member, from_imports)
-            })
-        })
-    {
-        FunctionType::ClassMethod
-    } else if decorator_list.iter().any(|expr| {
-        // The method is decorated with a static method decorator (like
-        // `@staticmethod`).
-        let call_path = dealias_call_path(collect_call_paths(expr), import_aliases);
-        settings.staticmethod_decorators.iter().any(|decorator| {
-            let (module, member) = to_module_and_member(decorator);
-            match_call_path(&call_path, module, member, from_imports)
-        })
-    }) {
-        FunctionType::StaticMethod
-    } else {
-        // It's an instance method.
-        FunctionType::Method
-    }
-}
-
 pub fn is_camelcase(name: &str) -> bool {
     !is_lower(name) && !is_upper(name) && !name.contains('_')
 }

src/printer.rs

@@ -9,7 +9,7 @@ use itertools::iterate;
 use rustpython_parser::ast::Location;
 use serde::Serialize;
 
-use crate::autofix::Fix;
+use crate::autofix::{fixer, Fix};
 use crate::checks::CheckCode;
 use crate::fs::relativize_path;
 use crate::linter::Diagnostics;
@@ -57,15 +57,15 @@ impl<'a> Printer<'a> {
         }
     }
 
-    fn post_text(&self, num_fixable: usize) {
+    fn post_text(&self, num_fixable: usize, autofix: &fixer::Mode) {
         if self.log_level >= &LogLevel::Default {
-            if num_fixable > 0 {
+            if num_fixable > 0 && !matches!(autofix, fixer::Mode::Apply) {
                 println!("{num_fixable} potentially fixable with the --fix option.");
             }
         }
     }
 
-    pub fn write_once(&self, diagnostics: &Diagnostics) -> Result<()> {
+    pub fn write_once(&self, diagnostics: &Diagnostics, autofix: &fixer::Mode) -> Result<()> {
         if matches!(self.log_level, LogLevel::Silent) {
             return Ok(());
         }
@@ -147,7 +147,7 @@ impl<'a> Printer<'a> {
                     print_message(message);
                 }
 
-                self.post_text(num_fixable);
+                self.post_text(num_fixable, autofix);
             }
             SerializationFormat::Grouped => {
                 self.pre_text(diagnostics);
@@ -190,7 +190,7 @@ impl<'a> Printer<'a> {
                     println!();
                 }
 
-                self.post_text(num_fixable);
+                self.post_text(num_fixable, autofix);
             }
             SerializationFormat::Github => {
                 self.pre_text(diagnostics);

src/pycodestyle/plugins.rs

@@ -298,11 +298,11 @@ pub fn do_not_assign_lambda(checker: &mut Checker, target: &Expr, value: &Expr,
                 {
                     match function(id, args, body) {
                         Ok(content) => {
-                            let indentation =
-                                &leading_space(&checker.locator.slice_source_code_range(&Range {
-                                    location: Location::new(stmt.location.row(), 0),
-                                    end_location: Location::new(stmt.location.row() + 1, 0),
-                                }));
+                            let first_line = checker.locator.slice_source_code_range(&Range {
+                                location: Location::new(stmt.location.row(), 0),
+                                end_location: Location::new(stmt.location.row() + 1, 0),
+                            });
+                            let indentation = &leading_space(&first_line);
                             let mut indented = String::new();
                             for (idx, line) in content.lines().enumerate() {
                                 if idx == 0 {

src/pydocstyle/helpers.rs

@@ -1,17 +1,23 @@
-use rustpython_ast::Expr;
-
-use crate::ast::types::Range;
 use crate::docstrings::constants;
-use crate::SourceCodeLocator;
+
+/// Strip the leading and trailing quotes from a docstring.
+pub fn raw_contents(contents: &str) -> &str {
+    for pattern in constants::TRIPLE_QUOTE_PREFIXES {
+        if contents.starts_with(pattern) {
+            return &contents[pattern.len()..contents.len() - 3];
+        }
+    }
+    for pattern in constants::SINGLE_QUOTE_PREFIXES {
+        if contents.starts_with(pattern) {
+            return &contents[pattern.len()..contents.len() - 1];
+        }
+    }
+    unreachable!("Expected docstring to start with a valid triple- or single-quote prefix")
+}
 
 /// Return the leading quote string for a docstring (e.g., `"""`).
-pub fn leading_quote<'a>(docstring: &Expr, locator: &'a SourceCodeLocator) -> Option<&'a str> {
-    if let Some(first_line) = locator
-        .slice_source_code_range(&Range::from_located(docstring))
-        .lines()
-        .next()
-        .map(str::to_lowercase)
-    {
+pub fn leading_quote(content: &str) -> Option<&str> {
+    if let Some(first_line) = content.lines().next() {
         for pattern in constants::TRIPLE_QUOTE_PREFIXES
             .iter()
             .chain(constants::SINGLE_QUOTE_PREFIXES)

src/pydocstyle/mod.rs

@@ -1,4 +1,4 @@
-mod helpers;
+pub mod helpers;
 pub mod plugins;
 
 #[cfg(test)]
@@ -37,6 +37,7 @@ mod tests {
     #[test_case(CheckCode::D214, Path::new("sections.py"); "D214")]
     #[test_case(CheckCode::D215, Path::new("sections.py"); "D215")]
     #[test_case(CheckCode::D300, Path::new("D.py"); "D300")]
+    #[test_case(CheckCode::D301, Path::new("D.py"); "D301")]
     #[test_case(CheckCode::D400, Path::new("D.py"); "D400_0")]
     #[test_case(CheckCode::D400, Path::new("D400.py"); "D400_1")]
     #[test_case(CheckCode::D402, Path::new("D.py"); "D402")]

src/pydocstyle/snapshots/ruff__pydocstyle__tests__D301_D.py.snap

@@ -0,0 +1,29 @@
+---
+source: src/pydocstyle/mod.rs
+expression: checks
+---
+- kind: UsesRPrefixForBackslashedContent
+  location:
+    row: 328
+    column: 4
+  end_location:
+    row: 328
+    column: 16
+  fix: ~
+- kind: UsesRPrefixForBackslashedContent
+  location:
+    row: 333
+    column: 4
+  end_location:
+    row: 333
+    column: 20
+  fix: ~
+- kind: UsesRPrefixForBackslashedContent
+  location:
+    row: 338
+    column: 4
+  end_location:
+    row: 338
+    column: 21
+  fix: ~
+

src/pyflakes/checks.rs

@@ -7,7 +7,7 @@ use rustpython_parser::ast::{
     Arg, Arguments, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprKind, Stmt, StmtKind,
 };
 
-use crate::ast::types::{BindingKind, FunctionScope, Range, Scope, ScopeKind};
+use crate::ast::types::{Binding, BindingKind, Range, Scope, ScopeKind};
 use crate::checks::{Check, CheckKind};
 use crate::pyflakes::cformat::CFormatSummary;
 use crate::pyflakes::format::FormatSummary;
@@ -366,12 +366,12 @@ pub fn if_tuple(test: &Expr, location: Range) -> Option<Check> {
 }
 
 /// F821
-pub fn undefined_local(scopes: &[&Scope], name: &str) -> Option<Check> {
+pub fn undefined_local(name: &str, scopes: &[&Scope], bindings: &[Binding]) -> Option<Check> {
     let current = &scopes.last().expect("No current scope found");
     if matches!(current.kind, ScopeKind::Function(_)) && !current.values.contains_key(name) {
         for scope in scopes.iter().rev().skip(1) {
             if matches!(scope.kind, ScopeKind::Function(_) | ScopeKind::Module) {
-                if let Some(binding) = scope.values.get(name) {
+                if let Some(binding) = scope.values.get(name).map(|index| &bindings[*index]) {
                     if let Some((scope_id, location)) = binding.used {
                         if scope_id == current.id {
                             return Some(Check::new(
@@ -388,29 +388,31 @@ pub fn undefined_local(scopes: &[&Scope], name: &str) -> Option<Check> {
 }
 
 /// F841
-pub fn unused_variables(scope: &Scope, dummy_variable_rgx: &Regex) -> Vec<Check> {
+pub fn unused_variable(
+    scope: &Scope,
+    bindings: &[Binding],
+    dummy_variable_rgx: &Regex,
+) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
-    if matches!(
-        scope.kind,
-        ScopeKind::Function(FunctionScope {
-            uses_locals: true,
-            ..
-        })
-    ) {
+    if scope.uses_locals && matches!(scope.kind, ScopeKind::Function(..)) {
         return checks;
     }
 
-    for (&name, binding) in &scope.values {
+    for (name, binding) in scope
+        .values
+        .iter()
+        .map(|(name, index)| (name, &bindings[*index]))
+    {
         if binding.used.is_none()
             && matches!(binding.kind, BindingKind::Assignment)
             && !dummy_variable_rgx.is_match(name)
-            && name != "__tracebackhide__"
-            && name != "__traceback_info__"
-            && name != "__traceback_supplement__"
+            && name != &"__tracebackhide__"
+            && name != &"__traceback_info__"
+            && name != &"__traceback_supplement__"
         {
             checks.push(Check::new(
-                CheckKind::UnusedVariable(name.to_string()),
+                CheckKind::UnusedVariable((*name).to_string()),
                 binding.range,
             ));
         }
@@ -419,6 +421,31 @@ pub fn unused_variables(scope: &Scope, dummy_variable_rgx: &Regex) -> Vec<Check>
     checks
 }
 
+/// F842
+pub fn unused_annotation(
+    scope: &Scope,
+    bindings: &[Binding],
+    dummy_variable_rgx: &Regex,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+    for (name, binding) in scope
+        .values
+        .iter()
+        .map(|(name, index)| (name, &bindings[*index]))
+    {
+        if binding.used.is_none()
+            && matches!(binding.kind, BindingKind::Annotation)
+            && !dummy_variable_rgx.is_match(name)
+        {
+            checks.push(Check::new(
+                CheckKind::UnusedAnnotation((*name).to_string()),
+                binding.range,
+            ));
+        }
+    }
+    checks
+}
+
 /// F707
 pub fn default_except_not_last(handlers: &[Excepthandler]) -> Option<Check> {
     for (idx, handler) in handlers.iter().enumerate() {
@@ -552,12 +579,13 @@ pub fn starred_expressions(
 }
 
 /// F701
-pub fn break_outside_loop(stmt: &Stmt, parents: &[&Stmt], parent_stack: &[usize]) -> Option<Check> {
+pub fn break_outside_loop<'a>(
+    stmt: &'a Stmt,
+    parents: &mut impl Iterator<Item = &'a Stmt>,
+) -> Option<Check> {
     let mut allowed: bool = false;
-    let mut parent = stmt;
-    for index in parent_stack.iter().rev() {
-        let child = parent;
-        parent = parents[*index];
+    let mut child = stmt;
+    for parent in parents {
         match &parent.node {
             StmtKind::For { orelse, .. }
             | StmtKind::AsyncFor { orelse, .. }
@@ -567,7 +595,6 @@ pub fn break_outside_loop(stmt: &Stmt, parents: &[&Stmt], parent_stack: &[usize]
                     break;
                 }
             }
-
             StmtKind::FunctionDef { .. }
             | StmtKind::AsyncFunctionDef { .. }
             | StmtKind::ClassDef { .. } => {
@@ -575,6 +602,7 @@ pub fn break_outside_loop(stmt: &Stmt, parents: &[&Stmt], parent_stack: &[usize]
             }
             _ => {}
         }
+        child = parent;
     }
 
     if allowed {
@@ -588,16 +616,13 @@ pub fn break_outside_loop(stmt: &Stmt, parents: &[&Stmt], parent_stack: &[usize]
 }
 
 /// F702
-pub fn continue_outside_loop(
-    stmt: &Stmt,
-    parents: &[&Stmt],
-    parent_stack: &[usize],
+pub fn continue_outside_loop<'a>(
+    stmt: &'a Stmt,
+    parents: &mut impl Iterator<Item = &'a Stmt>,
 ) -> Option<Check> {
     let mut allowed: bool = false;
-    let mut parent = stmt;
-    for index in parent_stack.iter().rev() {
-        let child = parent;
-        parent = parents[*index];
+    let mut child = stmt;
+    for parent in parents {
         match &parent.node {
             StmtKind::For { orelse, .. }
             | StmtKind::AsyncFor { orelse, .. }
@@ -607,7 +632,6 @@ pub fn continue_outside_loop(
                     break;
                 }
             }
-
             StmtKind::FunctionDef { .. }
             | StmtKind::AsyncFunctionDef { .. }
             | StmtKind::ClassDef { .. } => {
@@ -615,6 +639,7 @@ pub fn continue_outside_loop(
             }
             _ => {}
         }
+        child = parent;
     }
 
     if allowed {

src/pyflakes/foo.rs

@@ -0,0 +1 @@
+

src/pyflakes/plugins/invalid_print_syntax.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind};
 
-use crate::ast::types::{Binding, BindingKind, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -12,12 +12,7 @@ pub fn invalid_print_syntax(checker: &mut Checker, left: &Expr) {
     if id != "print" {
         return;
     }
-    let scope = checker.current_scope();
-    let Some(Binding {
-        kind: BindingKind::Builtin,
-        ..
-    }) = scope.values.get("print") else
-    {
+    if !checker.is_builtin("print") {
         return;
     };
     checker.add_check(Check::new(

src/pyflakes/snapshots/ruff__pyflakes__tests__F811_F811_0.py.snap

@@ -0,0 +1,16 @@
+---
+source: src/pyflakes/mod.rs
+expression: checks
+---
+- kind:
+    RedefinedWhileUnused:
+      - bar
+      - 6
+  location:
+    row: 10
+    column: 0
+  end_location:
+    row: 12
+    column: 0
+  fix: ~
+