Bump version to 0.0.105

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.104
+    rev: v0.0.105
     hooks:
       - id: ruff
 

Cargo.lock

@@ -920,7 +920,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8-to-ruff"
-version = "0.0.104-dev.0"
+version = "0.0.105-dev.0"
 dependencies = [
  "anyhow",
  "clap 4.0.15",
@@ -2221,7 +2221,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.104"
+version = "0.0.105"
 dependencies = [
  "anyhow",
  "assert_cmd",
@@ -2266,7 +2266,7 @@ dependencies = [
 
 [[package]]
 name = "ruff_dev"
-version = "0.0.104"
+version = "0.0.105"
 dependencies = [
  "anyhow",
  "clap 4.0.15",

Cargo.toml

@@ -6,7 +6,7 @@ members = [
 
 [package]
 name = "ruff"
-version = "0.0.104"
+version = "0.0.105"
 edition = "2021"
 
 [lib]

README.md

@@ -52,8 +52,9 @@ Read the [launch blog post](https://notes.crmarsh.com/python-tooling-could-be-mu
    8. [flake8-builtins](#flake8-builtins)
    9. [flake8-print](#flake8-print)
    10. [flake8-quotes](#flake8-quotes)
-   11. [Ruff-specific rules](#ruff-specific-rules)
-   12. [Meta rules](#meta-rules)
+   11. [flake8-annotations](#flake8-annotations)
+   12. [Ruff-specific rules](#ruff-specific-rules)
+   13. [Meta rules](#meta-rules)
 5. [Editor Integrations](#editor-integrations)
 6. [FAQ](#faq)
 7. [Development](#development)
@@ -93,7 +94,7 @@ Ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.104
+    rev: v0.0.105
     hooks:
       - id: ruff
 ```
@@ -523,6 +524,23 @@ For more, see [flake8-quotes](https://pypi.org/project/flake8-quotes/3.3.1/) on
 | Q002 | BadQuotesDocstring | Single quote docstring found but double quotes preferred |  |
 | Q003 | AvoidQuoteEscape | Change outer quotes to avoid escaping inner quotes |  |
 
+### flake8-annotations
+
+For more, see [flake8-annotations](https://pypi.org/project/flake8-annotations/2.9.1/) on PyPI.
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| ANN001 | MissingTypeFunctionArgument | Missing type annotation for function argument |  |
+| ANN002 | MissingTypeArgs | Missing type annotation for `*args` |  |
+| ANN003 | MissingTypeKwargs | Missing type annotation for `**kwargs` |  |
+| ANN101 | MissingTypeSelf | Missing type annotation for `self` in method |  |
+| ANN102 | MissingTypeCls | Missing type annotation for `cls` in classmethod |  |
+| ANN201 | MissingReturnTypePublicFunction | Missing return type annotation for public function |  |
+| ANN202 | MissingReturnTypePrivateFunction | Missing return type annotation for private function |  |
+| ANN204 | MissingReturnTypeMagicMethod | Missing return type annotation for magic method |  |
+| ANN205 | MissingReturnTypeStaticMethod | Missing return type annotation for staticmethod |  |
+| ANN206 | MissingReturnTypeClassMethod | Missing return type annotation for classmethod |  |
+
 ### Ruff-specific rules
 
 | Code | Name | Message | Fix |
@@ -605,6 +623,7 @@ including:
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
 - [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
+- [`flake8-annotations`](https://pypi.org/project/flake8-annotations/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
 - [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (15/32)
 - [`pyupgrade`](https://pypi.org/project/pyupgrade/) (11/34)
@@ -627,6 +646,7 @@ Today, Ruff can be used to replace Flake8 when used with any of the following pl
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
 - [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
+- [`flake8-annotations`](https://pypi.org/project/flake8-annotations/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
 - [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (15/32)
 

flake8_to_ruff/Cargo.lock

@@ -771,7 +771,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8_to_ruff"
-version = "0.0.104"
+version = "0.0.105"
 dependencies = [
  "anyhow",
  "clap",
@@ -1975,7 +1975,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.104"
+version = "0.0.105"
 dependencies = [
  "anyhow",
  "bincode",

flake8_to_ruff/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "flake8-to-ruff"
-version = "0.0.104-dev.0"
+version = "0.0.105-dev.0"
 edition = "2021"
 
 [lib]

flake8_to_ruff/src/converter.rs

@@ -4,7 +4,7 @@ use anyhow::Result;
 use ruff::flake8_quotes::settings::Quote;
 use ruff::settings::options::Options;
 use ruff::settings::pyproject::Pyproject;
-use ruff::{flake8_quotes, pep8_naming};
+use ruff::{flake8_annotations, flake8_quotes, pep8_naming};
 
 use crate::plugin::Plugin;
 use crate::{parser, plugin};
@@ -39,6 +39,7 @@ pub fn convert(
 
     // Parse each supported option.
     let mut options: Options = Default::default();
+    let mut flake8_annotations: flake8_annotations::settings::Options = Default::default();
     let mut flake8_quotes: flake8_quotes::settings::Options = Default::default();
     let mut pep8_naming: pep8_naming::settings::Options = Default::default();
     for (key, value) in flake8 {
@@ -78,6 +79,25 @@ pub fn convert(
                         Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
                     }
                 }
+                // flake8-annotations
+                "suppress-none-returning" | "suppress_none_returning" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.suppress_none_returning = Some(bool),
+                        Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                    }
+                }
+                "suppress-dummy-args" | "suppress_dummy_args" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.suppress_dummy_args = Some(bool),
+                        Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                    }
+                }
+                "mypy-init-return" | "mypy_init_return" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.mypy_init_return = Some(bool),
+                        Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                    }
+                }
                 // flake8-quotes
                 "quotes" | "inline-quotes" | "inline_quotes" => match value.trim() {
                     "'" | "single" => flake8_quotes.inline_quotes = Some(Quote::Single),
@@ -94,10 +114,9 @@ pub fn convert(
                     "\"" | "double" => flake8_quotes.docstring_quotes = Some(Quote::Single),
                     _ => eprintln!("Unexpected '{key}' value: {value}"),
                 },
-                "avoid-escape" | "avoid_escape" => match value.trim() {
-                    "true" => flake8_quotes.avoid_escape = Some(true),
-                    "false" => flake8_quotes.avoid_escape = Some(false),
-                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                "avoid-escape" | "avoid_escape" => match parser::parse_bool(value.as_ref()) {
+                    Ok(bool) => flake8_quotes.avoid_escape = Some(bool),
+                    Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
                 },
                 // pep8-naming
                 "ignore-names" | "ignore_names" => {
@@ -166,6 +185,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: None,
             pep8_naming: None,
         });
@@ -195,6 +215,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: None,
             pep8_naming: None,
         });
@@ -224,6 +245,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: None,
             pep8_naming: None,
         });
@@ -253,6 +275,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: None,
             pep8_naming: None,
         });
@@ -282,6 +305,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: Some(flake8_quotes::settings::Options {
                 inline_quotes: Some(flake8_quotes::settings::Quote::Single),
                 multiline_quotes: None,
@@ -354,6 +378,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: None,
             pep8_naming: None,
         });
@@ -384,6 +409,7 @@ mod tests {
             per_file_ignores: None,
             dummy_variable_rgx: None,
             target_version: None,
+            flake8_annotations: None,
             flake8_quotes: Some(flake8_quotes::settings::Options {
                 inline_quotes: Some(flake8_quotes::settings::Quote::Single),
                 multiline_quotes: None,

flake8_to_ruff/src/parser.rs

@@ -37,6 +37,15 @@ pub fn parse_strings(value: &str) -> Vec<String> {
         .collect()
 }
 
+/// Parse a boolean.
+pub fn parse_bool(value: &str) -> Result<bool> {
+    match value.trim() {
+        "true" => Ok(true),
+        "false" => Ok(false),
+        _ => Err(anyhow::anyhow!("Unexpected boolean value: {value}")),
+    }
+}
+
 #[derive(Debug)]
 struct Token {
     token_name: TokenType,

flake8_to_ruff/src/plugin.rs

@@ -12,6 +12,7 @@ pub enum Plugin {
     Flake8Docstrings,
     Flake8Print,
     Flake8Quotes,
+    Flake8Annotations,
     PEP8Naming,
     Pyupgrade,
 }
@@ -27,6 +28,7 @@ impl FromStr for Plugin {
             "flake8-docstrings" => Ok(Plugin::Flake8Docstrings),
             "flake8-print" => Ok(Plugin::Flake8Print),
             "flake8-quotes" => Ok(Plugin::Flake8Quotes),
+            "flake8-annotations" => Ok(Plugin::Flake8Annotations),
             "pep8-naming" => Ok(Plugin::PEP8Naming),
             "pyupgrade" => Ok(Plugin::Pyupgrade),
             _ => Err(anyhow!("Unknown plugin: {}", string)),
@@ -58,6 +60,7 @@ impl Plugin {
             }
             Plugin::Flake8Print => vec![CheckCodePrefix::T],
             Plugin::Flake8Quotes => vec![CheckCodePrefix::Q],
+            Plugin::Flake8Annotations => vec![CheckCodePrefix::ANN],
             Plugin::PEP8Naming => vec![CheckCodePrefix::N],
             Plugin::Pyupgrade => vec![CheckCodePrefix::U],
         }
@@ -262,6 +265,31 @@ pub fn infer_plugins(flake8: &HashMap<String, Option<String>>) -> Vec<Plugin> {
             "avoid-escape" | "avoid_escape" => {
                 plugins.insert(Plugin::Flake8Quotes);
             }
+            // flake8-annotations
+            "suppress-none-returning" | "suppress_none_returning" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "suppress-dummy-args" | "suppress_dummy_args" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-untyped-defs" | "allow_untyped_defs" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-untyped-nested" | "allow_untyped_nested" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "mypy-init-return" | "mypy_init_return" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "dispatch-decorators" | "dispatch_decorators" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "overload-decorators" | "overload_decorators" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-star-arg-any" | "allow_star_arg_any" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
             // pep8-naming
             "ignore-names" | "ignore_names" => {
                 plugins.insert(Plugin::PEP8Naming);

resources/test/fixtures/flake8_annotations/annotation_presence.py

@@ -0,0 +1,33 @@
+# Error
+def foo(a, b):
+    pass
+
+
+# Error
+def foo(a: int, b):
+    pass
+
+
+# Error
+def foo(a: int, b) -> int:
+    pass
+
+
+# Error
+def foo(a: int, b: int):
+    pass
+
+
+# Error
+def foo():
+    pass
+
+
+# OK
+def foo(a: int, b: int) -> int:
+    pass
+
+
+# OK
+def foo() -> int:
+    pass

resources/test/fixtures/flake8_annotations/mypy_init_return.py

@@ -0,0 +1,41 @@
+"""Test case expected to be run with `mypy_init_return = True`."""
+
+# Error
+class Foo:
+    def __init__(self):
+        ...
+
+
+# Error
+class Foo:
+    def __init__(self, foo):
+        ...
+
+
+# OK
+class Foo:
+    def __init__(self, foo) -> None:
+        ...
+
+
+# OK
+class Foo:
+    def __init__(self) -> None:
+        ...
+
+
+# OK
+class Foo:
+    def __init__(self, foo: int):
+        ...
+
+
+# OK
+class Foo:
+    def __init__(self, foo: int) -> None:
+        ...
+
+
+# Error
+def __init__(self, foo: int):
+    ...

resources/test/fixtures/flake8_annotations/suppress_dummy_args.py

@@ -0,0 +1,26 @@
+"""Test case expected to be run with `suppress_dummy_args = True`."""
+
+# OK
+def foo(_) -> None:
+    ...
+
+
+# OK
+def foo(*_) -> None:
+    ...
+
+
+# OK
+def foo(**_) -> None:
+    ...
+
+
+# OK
+def foo(a: int, _) -> None:
+    ...
+
+
+# OK
+def foo() -> None:
+    def bar(_) -> None:
+        ...

resources/test/fixtures/flake8_annotations/suppress_none_returning.py

@@ -0,0 +1,55 @@
+"""Test case expected to be run with `suppress_none_returning = True`."""
+
+# OK
+def foo():
+    a = 2 + 2
+
+
+# OK
+def foo():
+    return
+
+
+# OK
+def foo():
+    return None
+
+
+# OK
+def foo():
+    a = 2 + 2
+    if a == 4:
+        return
+    else:
+        return
+
+
+# OK
+def foo():
+    a = 2 + 2
+    if a == 4:
+        return None
+    else:
+        return
+
+
+# OK
+def foo():
+    def bar() -> bool:
+        return True
+
+    bar()
+
+
+# Error
+def foo():
+    return True
+
+
+# Error
+def foo():
+    a = 2 + 2
+    if a == 4:
+        return True
+    else:
+        return

ruff_dev/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff_dev"
-version = "0.0.104"
+version = "0.0.105"
 edition = "2021"
 
 [dependencies]

src/ast/types.rs

@@ -100,10 +100,6 @@ pub struct Binding {
     pub used: Option<(usize, Range)>,
 }
 
-pub trait CheckLocator {
-    fn locate_check(&self, default: Range) -> Range;
-}
-
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum ImportKind {
     Import,

src/checks.rs

@@ -115,6 +115,17 @@ pub enum CheckCode {
     Q001,
     Q002,
     Q003,
+    // flake8-annotations
+    ANN001,
+    ANN002,
+    ANN003,
+    ANN101,
+    ANN102,
+    ANN201,
+    ANN202,
+    ANN204,
+    ANN205,
+    ANN206,
     // pyupgrade
     U001,
     U002,
@@ -205,6 +216,7 @@ pub enum CheckCategory {
     Flake8Builtins,
     Flake8Print,
     Flake8Quotes,
+    Flake8Annotations,
     Ruff,
     Meta,
 }
@@ -219,6 +231,7 @@ impl CheckCategory {
             CheckCategory::Flake8Comprehensions => "flake8-comprehensions",
             CheckCategory::Flake8Print => "flake8-print",
             CheckCategory::Flake8Quotes => "flake8-quotes",
+            CheckCategory::Flake8Annotations => "flake8-annotations",
             CheckCategory::Pyupgrade => "pyupgrade",
             CheckCategory::Pydocstyle => "pydocstyle",
             CheckCategory::PEP8Naming => "pep8-naming",
@@ -242,6 +255,9 @@ impl CheckCategory {
             }
             CheckCategory::Flake8Print => Some("https://pypi.org/project/flake8-print/5.0.0/"),
             CheckCategory::Flake8Quotes => Some("https://pypi.org/project/flake8-quotes/3.3.1/"),
+            CheckCategory::Flake8Annotations => {
+                Some("https://pypi.org/project/flake8-annotations/2.9.1/")
+            }
             CheckCategory::Pyupgrade => Some("https://pypi.org/project/pyupgrade/3.2.0/"),
             CheckCategory::Pydocstyle => Some("https://pypi.org/project/pydocstyle/6.1.1/"),
             CheckCategory::PEP8Naming => Some("https://pypi.org/project/pep8-naming/0.13.2/"),
@@ -357,6 +373,17 @@ pub enum CheckKind {
     BadQuotesMultilineString(Quote),
     BadQuotesDocstring(Quote),
     AvoidQuoteEscape,
+    // flake8-annotations
+    MissingTypeFunctionArgument,
+    MissingTypeArgs,
+    MissingTypeKwargs,
+    MissingTypeSelf,
+    MissingTypeCls,
+    MissingReturnTypePublicFunction,
+    MissingReturnTypePrivateFunction,
+    MissingReturnTypeMagicMethod,
+    MissingReturnTypeStaticMethod,
+    MissingReturnTypeClassMethod,
     // pyupgrade
     TypeOfPrimitive(Primitive),
     UnnecessaryAbspath,
@@ -565,6 +592,17 @@ impl CheckCode {
             CheckCode::Q001 => CheckKind::BadQuotesMultilineString(Quote::Double),
             CheckCode::Q002 => CheckKind::BadQuotesDocstring(Quote::Double),
             CheckCode::Q003 => CheckKind::AvoidQuoteEscape,
+            // flake8-annotations
+            CheckCode::ANN001 => CheckKind::MissingTypeFunctionArgument,
+            CheckCode::ANN002 => CheckKind::MissingTypeArgs,
+            CheckCode::ANN003 => CheckKind::MissingTypeKwargs,
+            CheckCode::ANN101 => CheckKind::MissingTypeSelf,
+            CheckCode::ANN102 => CheckKind::MissingTypeCls,
+            CheckCode::ANN201 => CheckKind::MissingReturnTypePublicFunction,
+            CheckCode::ANN202 => CheckKind::MissingReturnTypePrivateFunction,
+            CheckCode::ANN204 => CheckKind::MissingReturnTypeMagicMethod,
+            CheckCode::ANN205 => CheckKind::MissingReturnTypeStaticMethod,
+            CheckCode::ANN206 => CheckKind::MissingReturnTypeClassMethod,
             // pyupgrade
             CheckCode::U001 => CheckKind::UselessMetaclassType,
             CheckCode::U002 => CheckKind::UnnecessaryAbspath,
@@ -747,6 +785,16 @@ impl CheckCode {
             CheckCode::Q001 => CheckCategory::Flake8Quotes,
             CheckCode::Q002 => CheckCategory::Flake8Quotes,
             CheckCode::Q003 => CheckCategory::Flake8Quotes,
+            CheckCode::ANN001 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN002 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN003 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN101 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN102 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN201 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN202 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN204 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN205 => CheckCategory::Flake8Annotations,
+            CheckCode::ANN206 => CheckCategory::Flake8Annotations,
             CheckCode::U001 => CheckCategory::Pyupgrade,
             CheckCode::U002 => CheckCategory::Pyupgrade,
             CheckCode::U003 => CheckCategory::Pyupgrade,
@@ -915,6 +963,17 @@ impl CheckKind {
             CheckKind::BadQuotesMultilineString(_) => &CheckCode::Q001,
             CheckKind::BadQuotesDocstring(_) => &CheckCode::Q002,
             CheckKind::AvoidQuoteEscape => &CheckCode::Q003,
+            // flake8-annotations
+            CheckKind::MissingTypeFunctionArgument => &CheckCode::ANN001,
+            CheckKind::MissingTypeArgs => &CheckCode::ANN002,
+            CheckKind::MissingTypeKwargs => &CheckCode::ANN003,
+            CheckKind::MissingTypeSelf => &CheckCode::ANN101,
+            CheckKind::MissingTypeCls => &CheckCode::ANN102,
+            CheckKind::MissingReturnTypePublicFunction => &CheckCode::ANN201,
+            CheckKind::MissingReturnTypePrivateFunction => &CheckCode::ANN202,
+            CheckKind::MissingReturnTypeMagicMethod => &CheckCode::ANN204,
+            CheckKind::MissingReturnTypeStaticMethod => &CheckCode::ANN205,
+            CheckKind::MissingReturnTypeClassMethod => &CheckCode::ANN206,
             // pyupgrade
             CheckKind::TypeOfPrimitive(_) => &CheckCode::U003,
             CheckKind::UnnecessaryAbspath => &CheckCode::U002,
@@ -1300,6 +1359,33 @@ impl CheckKind {
             CheckKind::AvoidQuoteEscape => {
                 "Change outer quotes to avoid escaping inner quotes".to_string()
             }
+            // flake8-annotations
+            CheckKind::MissingTypeFunctionArgument => {
+                "Missing type annotation for function argument".to_string()
+            }
+            CheckKind::MissingTypeArgs => "Missing type annotation for `*args`".to_string(),
+            CheckKind::MissingTypeKwargs => "Missing type annotation for `**kwargs`".to_string(),
+            CheckKind::MissingTypeSelf => {
+                "Missing type annotation for `self` in method".to_string()
+            }
+            CheckKind::MissingTypeCls => {
+                "Missing type annotation for `cls` in classmethod".to_string()
+            }
+            CheckKind::MissingReturnTypePublicFunction => {
+                "Missing return type annotation for public function".to_string()
+            }
+            CheckKind::MissingReturnTypePrivateFunction => {
+                "Missing return type annotation for private function".to_string()
+            }
+            CheckKind::MissingReturnTypeMagicMethod => {
+                "Missing return type annotation for magic method".to_string()
+            }
+            CheckKind::MissingReturnTypeStaticMethod => {
+                "Missing return type annotation for staticmethod".to_string()
+            }
+            CheckKind::MissingReturnTypeClassMethod => {
+                "Missing return type annotation for classmethod".to_string()
+            }
             // pyupgrade
             CheckKind::TypeOfPrimitive(primitive) => {
                 format!("Use `{}` instead of `type(...)`", primitive.builtin())

src/checks_gen.rs

@@ -13,6 +13,23 @@ pub enum CheckCodePrefix {
     A001,
     A002,
     A003,
+    ANN,
+    ANN0,
+    ANN00,
+    ANN001,
+    ANN002,
+    ANN003,
+    ANN1,
+    ANN10,
+    ANN101,
+    ANN102,
+    ANN2,
+    ANN20,
+    ANN201,
+    ANN202,
+    ANN204,
+    ANN205,
+    ANN206,
     B,
     B0,
     B00,
@@ -257,6 +274,46 @@ impl CheckCodePrefix {
             CheckCodePrefix::A001 => vec![CheckCode::A001],
             CheckCodePrefix::A002 => vec![CheckCode::A002],
             CheckCodePrefix::A003 => vec![CheckCode::A003],
+            CheckCodePrefix::ANN => vec![
+                CheckCode::ANN001,
+                CheckCode::ANN002,
+                CheckCode::ANN003,
+                CheckCode::ANN101,
+                CheckCode::ANN102,
+                CheckCode::ANN201,
+                CheckCode::ANN202,
+                CheckCode::ANN204,
+                CheckCode::ANN205,
+                CheckCode::ANN206,
+            ],
+            CheckCodePrefix::ANN0 => vec![CheckCode::ANN001, CheckCode::ANN002, CheckCode::ANN003],
+            CheckCodePrefix::ANN00 => vec![CheckCode::ANN001, CheckCode::ANN002, CheckCode::ANN003],
+            CheckCodePrefix::ANN001 => vec![CheckCode::ANN001],
+            CheckCodePrefix::ANN002 => vec![CheckCode::ANN002],
+            CheckCodePrefix::ANN003 => vec![CheckCode::ANN003],
+            CheckCodePrefix::ANN1 => vec![CheckCode::ANN101, CheckCode::ANN102],
+            CheckCodePrefix::ANN10 => vec![CheckCode::ANN101, CheckCode::ANN102],
+            CheckCodePrefix::ANN101 => vec![CheckCode::ANN101],
+            CheckCodePrefix::ANN102 => vec![CheckCode::ANN102],
+            CheckCodePrefix::ANN2 => vec![
+                CheckCode::ANN201,
+                CheckCode::ANN202,
+                CheckCode::ANN204,
+                CheckCode::ANN205,
+                CheckCode::ANN206,
+            ],
+            CheckCodePrefix::ANN20 => vec![
+                CheckCode::ANN201,
+                CheckCode::ANN202,
+                CheckCode::ANN204,
+                CheckCode::ANN205,
+                CheckCode::ANN206,
+            ],
+            CheckCodePrefix::ANN201 => vec![CheckCode::ANN201],
+            CheckCodePrefix::ANN202 => vec![CheckCode::ANN202],
+            CheckCodePrefix::ANN204 => vec![CheckCode::ANN204],
+            CheckCodePrefix::ANN205 => vec![CheckCode::ANN205],
+            CheckCodePrefix::ANN206 => vec![CheckCode::ANN206],
             CheckCodePrefix::B => vec![
                 CheckCode::B002,
                 CheckCode::B003,
@@ -931,6 +988,23 @@ impl CheckCodePrefix {
             CheckCodePrefix::A001 => PrefixSpecificity::Explicit,
             CheckCodePrefix::A002 => PrefixSpecificity::Explicit,
             CheckCodePrefix::A003 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN => PrefixSpecificity::Category,
+            CheckCodePrefix::ANN0 => PrefixSpecificity::Hundreds,
+            CheckCodePrefix::ANN00 => PrefixSpecificity::Tens,
+            CheckCodePrefix::ANN001 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN002 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN003 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN1 => PrefixSpecificity::Hundreds,
+            CheckCodePrefix::ANN10 => PrefixSpecificity::Tens,
+            CheckCodePrefix::ANN101 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN102 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN2 => PrefixSpecificity::Hundreds,
+            CheckCodePrefix::ANN20 => PrefixSpecificity::Tens,
+            CheckCodePrefix::ANN201 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN202 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN204 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN205 => PrefixSpecificity::Explicit,
+            CheckCodePrefix::ANN206 => PrefixSpecificity::Explicit,
             CheckCodePrefix::B => PrefixSpecificity::Category,
             CheckCodePrefix::B0 => PrefixSpecificity::Hundreds,
             CheckCodePrefix::B00 => PrefixSpecificity::Tens,

src/cli.rs

@@ -10,7 +10,7 @@ use crate::checks_gen::CheckCodePrefix;
 use crate::logging::LogLevel;
 use crate::printer::SerializationFormat;
 use crate::settings::configuration::Configuration;
-use crate::settings::types::{PatternPrefixPair, PythonVersion};
+use crate::settings::types::{PatternPrefixPair, PerFileIgnore, PythonVersion};
 
 #[derive(Debug, Parser)]
 #[command(author, about = "ruff: An extremely fast Python linter.")]
@@ -168,7 +168,8 @@ pub fn warn_on(
 /// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
 pub fn collect_per_file_ignores(
     pairs: Vec<PatternPrefixPair>,
-) -> BTreeMap<String, Vec<CheckCodePrefix>> {
+    project_root: &Option<PathBuf>,
+) -> Vec<PerFileIgnore> {
     let mut per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>> = BTreeMap::new();
     for pair in pairs {
         per_file_ignores
@@ -177,4 +178,7 @@ pub fn collect_per_file_ignores(
             .push(pair.prefix);
     }
     per_file_ignores
+        .iter()
+        .map(|(pattern, prefixes)| PerFileIgnore::new(pattern, prefixes, project_root))
+        .collect()
 }

src/flake8_annotations/mod.rs

@@ -0,0 +1,131 @@
+pub mod plugins;
+pub mod settings;
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    use anyhow::Result;
+    use rustpython_parser::lexer::LexResult;
+
+    use crate::autofix::fixer;
+    use crate::checks::{Check, CheckCode};
+    use crate::linter::tokenize;
+    use crate::{flake8_annotations, fs, linter, noqa, Settings, SourceCodeLocator};
+
+    fn check_path(path: &Path, settings: &Settings, autofix: &fixer::Mode) -> Result<Vec<Check>> {
+        let contents = fs::read_file(path)?;
+        let tokens: Vec<LexResult> = tokenize(&contents);
+        let locator = SourceCodeLocator::new(&contents);
+        let noqa_line_for = noqa::extract_noqa_line_for(&tokens);
+        linter::check_path(
+            path,
+            &contents,
+            tokens,
+            &locator,
+            &noqa_line_for,
+            settings,
+            autofix,
+        )
+    }
+
+    #[test]
+    fn defaults() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_annotations/annotation_presence.py"),
+            &Settings {
+                ..Settings::for_rules(vec![
+                    CheckCode::ANN001,
+                    CheckCode::ANN002,
+                    CheckCode::ANN003,
+                    CheckCode::ANN101,
+                    CheckCode::ANN102,
+                    CheckCode::ANN201,
+                    CheckCode::ANN202,
+                    CheckCode::ANN204,
+                    CheckCode::ANN205,
+                    CheckCode::ANN206,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn suppress_dummy_args() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_annotations/suppress_dummy_args.py"),
+            &Settings {
+                flake8_annotations: flake8_annotations::settings::Settings {
+                    mypy_init_return: false,
+                    suppress_dummy_args: true,
+                    suppress_none_returning: false,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::ANN001,
+                    CheckCode::ANN002,
+                    CheckCode::ANN003,
+                    CheckCode::ANN101,
+                    CheckCode::ANN102,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn mypy_init_return() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_annotations/mypy_init_return.py"),
+            &Settings {
+                flake8_annotations: flake8_annotations::settings::Settings {
+                    mypy_init_return: true,
+                    suppress_dummy_args: false,
+                    suppress_none_returning: false,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::ANN201,
+                    CheckCode::ANN202,
+                    CheckCode::ANN204,
+                    CheckCode::ANN205,
+                    CheckCode::ANN206,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn suppress_none_returning() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_annotations/suppress_none_returning.py"),
+            &Settings {
+                flake8_annotations: flake8_annotations::settings::Settings {
+                    mypy_init_return: false,
+                    suppress_dummy_args: false,
+                    suppress_none_returning: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::ANN201,
+                    CheckCode::ANN202,
+                    CheckCode::ANN204,
+                    CheckCode::ANN205,
+                    CheckCode::ANN206,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+}

src/flake8_annotations/plugins.rs

@@ -0,0 +1,326 @@
+use rustpython_ast::{Arguments, Constant, Expr, ExprKind, Stmt, StmtKind};
+
+use crate::ast::types::Range;
+use crate::ast::visitor;
+use crate::ast::visitor::Visitor;
+use crate::check_ast::Checker;
+use crate::checks::{CheckCode, CheckKind};
+use crate::docstrings::definition::{Definition, DefinitionKind};
+use crate::visibility::Visibility;
+use crate::{visibility, Check};
+
+#[derive(Default)]
+struct ReturnStatementVisitor<'a> {
+    returns: Vec<&'a Option<Box<Expr>>>,
+}
+
+impl<'a, 'b> Visitor<'b> for ReturnStatementVisitor<'a>
+where
+    'b: 'a,
+{
+    fn visit_stmt(&mut self, stmt: &'b Stmt) {
+        match &stmt.node {
+            StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. } => {
+                // No recurse.
+            }
+            StmtKind::Return { value } => self.returns.push(value),
+            _ => visitor::walk_stmt(self, stmt),
+        }
+    }
+}
+
+fn is_none_returning(stmt: &Stmt) -> bool {
+    let mut visitor: ReturnStatementVisitor = Default::default();
+    for stmt in match_body(stmt) {
+        visitor.visit_stmt(stmt);
+    }
+    for expr in visitor.returns.into_iter().flatten() {
+        if !matches!(
+            expr.node,
+            ExprKind::Constant {
+                value: Constant::None,
+                ..
+            }
+        ) {
+            return false;
+        }
+    }
+    true
+}
+
+fn match_args(stmt: &Stmt) -> &Arguments {
+    match &stmt.node {
+        StmtKind::FunctionDef { args, .. } | StmtKind::AsyncFunctionDef { args, .. } => args,
+        _ => panic!("Found non-FunctionDef in match_args"),
+    }
+}
+
+fn match_body(stmt: &Stmt) -> &Vec<Stmt> {
+    match &stmt.node {
+        StmtKind::FunctionDef { body, .. } | StmtKind::AsyncFunctionDef { body, .. } => body,
+        _ => panic!("Found non-FunctionDef in match_body"),
+    }
+}
+
+fn match_returns(stmt: &Stmt) -> &Option<Box<Expr>> {
+    match &stmt.node {
+        StmtKind::FunctionDef { returns, .. } | StmtKind::AsyncFunctionDef { returns, .. } => {
+            returns
+        }
+        _ => panic!("Found non-FunctionDef in match_returns"),
+    }
+}
+
+/// Generate flake8-annotation checks for a given `Definition`.
+pub fn definition(checker: &mut Checker, definition: &Definition, visibility: &Visibility) {
+    match &definition.kind {
+        DefinitionKind::Module => {}
+        DefinitionKind::Package => {}
+        DefinitionKind::Class(_) => {}
+        DefinitionKind::NestedClass(_) => {}
+        DefinitionKind::Function(stmt) | DefinitionKind::NestedFunction(stmt) => {
+            let args = match_args(stmt);
+            let returns = match_returns(stmt);
+
+            // ANN001
+            for arg in args
+                .args
+                .iter()
+                .chain(args.posonlyargs.iter())
+                .chain(args.kwonlyargs.iter())
+            {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN001) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeFunctionArgument,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                }
+            }
+
+            // ANN002
+            if let Some(arg) = &args.vararg {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN002) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeArgs,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                }
+            }
+
+            // ANN003
+            if let Some(arg) = &args.kwarg {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN003) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeKwargs,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                }
+            }
+
+            // ANN201, ANN202
+            if returns.is_none() {
+                // Allow omission of return annotation in `__init__` functions, if the function
+                // only returns `None` (explicitly or implicitly).
+                if checker.settings.flake8_annotations.suppress_none_returning
+                    && is_none_returning(stmt)
+                {
+                    return;
+                }
+
+                match visibility {
+                    Visibility::Public => {
+                        if checker.settings.enabled.contains(&CheckCode::ANN201) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingReturnTypePublicFunction,
+                                Range::from_located(stmt),
+                            ));
+                        }
+                    }
+                    Visibility::Private => {
+                        if checker.settings.enabled.contains(&CheckCode::ANN202) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingReturnTypePrivateFunction,
+                                Range::from_located(stmt),
+                            ));
+                        }
+                    }
+                }
+            }
+        }
+        DefinitionKind::Method(stmt) => {
+            let args = match_args(stmt);
+            let returns = match_returns(stmt);
+            let mut has_any_typed_arg = false;
+
+            // ANN001
+            for arg in args
+                .args
+                .iter()
+                .chain(args.posonlyargs.iter())
+                .chain(args.kwonlyargs.iter())
+                .skip(
+                    // If this is a non-static method, skip `cls` or `self`.
+                    usize::from(!visibility::is_staticmethod(stmt)),
+                )
+            {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN001) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeFunctionArgument,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                } else {
+                    has_any_typed_arg = true;
+                }
+            }
+
+            // ANN002
+            if let Some(arg) = &args.vararg {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN002) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeArgs,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                } else {
+                    has_any_typed_arg = true;
+                }
+            }
+
+            // ANN003
+            if let Some(arg) = &args.kwarg {
+                if arg.node.annotation.is_none() {
+                    if !(checker.settings.flake8_annotations.suppress_dummy_args
+                        && checker.settings.dummy_variable_rgx.is_match(&arg.node.arg))
+                    {
+                        if checker.settings.enabled.contains(&CheckCode::ANN003) {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingTypeKwargs,
+                                Range::from_located(arg),
+                            ));
+                        }
+                    }
+                } else {
+                    has_any_typed_arg = true;
+                }
+            }
+
+            // ANN101, ANN102
+            if !visibility::is_staticmethod(stmt) {
+                if let Some(arg) = args.args.first() {
+                    if arg.node.annotation.is_none() {
+                        if visibility::is_classmethod(stmt) {
+                            if checker.settings.enabled.contains(&CheckCode::ANN101) {
+                                checker.add_check(Check::new(
+                                    CheckKind::MissingTypeCls,
+                                    Range::from_located(arg),
+                                ));
+                            }
+                        } else {
+                            if checker.settings.enabled.contains(&CheckCode::ANN102) {
+                                checker.add_check(Check::new(
+                                    CheckKind::MissingTypeSelf,
+                                    Range::from_located(arg),
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+
+            // ANN201, ANN202
+            if returns.is_none() {
+                // Allow omission of return annotation in `__init__` functions, if the function
+                // only returns `None` (explicitly or implicitly).
+                if checker.settings.flake8_annotations.suppress_none_returning
+                    && is_none_returning(stmt)
+                {
+                    return;
+                }
+
+                if visibility::is_classmethod(stmt) {
+                    if checker.settings.enabled.contains(&CheckCode::ANN206) {
+                        checker.add_check(Check::new(
+                            CheckKind::MissingReturnTypeClassMethod,
+                            Range::from_located(stmt),
+                        ));
+                    }
+                } else if visibility::is_staticmethod(stmt) {
+                    if checker.settings.enabled.contains(&CheckCode::ANN205) {
+                        checker.add_check(Check::new(
+                            CheckKind::MissingReturnTypeStaticMethod,
+                            Range::from_located(stmt),
+                        ));
+                    }
+                } else if visibility::is_magic(stmt) {
+                    if checker.settings.enabled.contains(&CheckCode::ANN204) {
+                        checker.add_check(Check::new(
+                            CheckKind::MissingReturnTypeMagicMethod,
+                            Range::from_located(stmt),
+                        ));
+                    }
+                } else if visibility::is_init(stmt) {
+                    // Allow omission of return annotation in `__init__` functions, as long as at
+                    // least one argument is typed.
+                    if checker.settings.enabled.contains(&CheckCode::ANN204) {
+                        if !(checker.settings.flake8_annotations.mypy_init_return
+                            && has_any_typed_arg)
+                        {
+                            checker.add_check(Check::new(
+                                CheckKind::MissingReturnTypeMagicMethod,
+                                Range::from_located(stmt),
+                            ));
+                        }
+                    }
+                } else {
+                    match visibility {
+                        Visibility::Public => {
+                            if checker.settings.enabled.contains(&CheckCode::ANN201) {
+                                checker.add_check(Check::new(
+                                    CheckKind::MissingReturnTypePublicFunction,
+                                    Range::from_located(stmt),
+                                ));
+                            }
+                        }
+                        Visibility::Private => {
+                            if checker.settings.enabled.contains(&CheckCode::ANN202) {
+                                checker.add_check(Check::new(
+                                    CheckKind::MissingReturnTypePrivateFunction,
+                                    Range::from_located(stmt),
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

src/flake8_annotations/settings.rs

@@ -0,0 +1,36 @@
+//! Settings for the `flake-annotations` plugin.
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(deny_unknown_fields, rename_all = "kebab-case")]
+pub struct Options {
+    /// Allow omission of a return type hint for `__init__` if at least one
+    /// argument is annotated.
+    pub mypy_init_return: Option<bool>,
+    /// Suppress ANN000-level errors for dummy arguments, like `_`.
+    pub suppress_dummy_args: Option<bool>,
+    /// Suppress ANN200-level errors for functions that meet one of the
+    /// following criteria:
+    /// - Contain no `return` statement
+    /// - Explicit `return` statement(s) all return `None` (explicitly or
+    ///   implicitly).
+    pub suppress_none_returning: Option<bool>,
+}
+
+#[derive(Debug, Hash, Default)]
+pub struct Settings {
+    pub mypy_init_return: bool,
+    pub suppress_dummy_args: bool,
+    pub suppress_none_returning: bool,
+}
+
+impl Settings {
+    pub fn from_options(options: Options) -> Self {
+        Self {
+            mypy_init_return: options.mypy_init_return.unwrap_or_default(),
+            suppress_dummy_args: options.suppress_dummy_args.unwrap_or_default(),
+            suppress_none_returning: options.suppress_none_returning.unwrap_or_default(),
+        }
+    }
+}

src/flake8_annotations/snapshots/ruff__flake8_annotations__tests__defaults.snap

@@ -0,0 +1,69 @@
+---
+source: src/flake8_annotations/mod.rs
+expression: checks
+---
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 2
+    column: 0
+  end_location:
+    row: 7
+    column: 0
+  fix: ~
+- kind: MissingTypeFunctionArgument
+  location:
+    row: 2
+    column: 8
+  end_location:
+    row: 2
+    column: 9
+  fix: ~
+- kind: MissingTypeFunctionArgument
+  location:
+    row: 2
+    column: 11
+  end_location:
+    row: 2
+    column: 12
+  fix: ~
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 7
+    column: 0
+  end_location:
+    row: 12
+    column: 0
+  fix: ~
+- kind: MissingTypeFunctionArgument
+  location:
+    row: 7
+    column: 16
+  end_location:
+    row: 7
+    column: 17
+  fix: ~
+- kind: MissingTypeFunctionArgument
+  location:
+    row: 12
+    column: 16
+  end_location:
+    row: 12
+    column: 17
+  fix: ~
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 17
+    column: 0
+  end_location:
+    row: 22
+    column: 0
+  fix: ~
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 22
+    column: 0
+  end_location:
+    row: 27
+    column: 0
+  fix: ~
+

src/flake8_annotations/snapshots/ruff__flake8_annotations__tests__mypy_init_return.snap

@@ -0,0 +1,29 @@
+---
+source: src/flake8_annotations/mod.rs
+expression: checks
+---
+- kind: MissingReturnTypeMagicMethod
+  location:
+    row: 5
+    column: 4
+  end_location:
+    row: 10
+    column: 0
+  fix: ~
+- kind: MissingReturnTypeMagicMethod
+  location:
+    row: 11
+    column: 4
+  end_location:
+    row: 16
+    column: 0
+  fix: ~
+- kind: MissingReturnTypePrivateFunction
+  location:
+    row: 40
+    column: 0
+  end_location:
+    row: 42
+    column: 0
+  fix: ~
+

src/flake8_annotations/snapshots/ruff__flake8_annotations__tests__suppress_dummy_args.snap

@@ -0,0 +1,6 @@
+---
+source: src/flake8_annotations/mod.rs
+expression: checks
+---
+[]
+

src/flake8_annotations/snapshots/ruff__flake8_annotations__tests__suppress_none_returning.snap

@@ -0,0 +1,21 @@
+---
+source: src/flake8_annotations/mod.rs
+expression: checks
+---
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 45
+    column: 0
+  end_location:
+    row: 50
+    column: 0
+  fix: ~
+- kind: MissingReturnTypePublicFunction
+  location:
+    row: 50
+    column: 0
+  end_location:
+    row: 56
+    column: 0
+  fix: ~
+

src/flake8_bugbear/plugins/assert_false.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Constant, Expr, ExprContext, ExprKind, Stmt, StmtKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
@@ -42,10 +42,7 @@ pub fn assert_false(checker: &mut Checker, stmt: &Stmt, test: &Expr, msg: &Optio
         ..
     } = &test.node
     {
-        let mut check = Check::new(
-            CheckKind::DoNotAssertFalse,
-            checker.locate_check(Range::from_located(test)),
-        );
+        let mut check = Check::new(CheckKind::DoNotAssertFalse, Range::from_located(test));
         if checker.patch() {
             let mut generator = SourceGenerator::new();
             if let Ok(()) = generator.unparse_stmt(&assertion_error(msg)) {

src/flake8_bugbear/plugins/assert_raises_exception.rs

@@ -1,7 +1,7 @@
 use rustpython_ast::{ExprKind, Stmt, Withitem};
 
 use crate::ast::helpers::match_name_or_attr;
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -17,7 +17,7 @@ pub fn assert_raises_exception(checker: &mut Checker, stmt: &Stmt, items: &[With
             {
                 checker.add_check(Check::new(
                     CheckKind::NoAssertRaisesException,
-                    checker.locate_check(Range::from_located(stmt)),
+                    Range::from_located(stmt),
                 ));
             }
         }

src/flake8_bugbear/plugins/assignment_to_os_environ.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -14,7 +14,7 @@ pub fn assignment_to_os_environ(checker: &mut Checker, targets: &[Expr]) {
                     if id == "os" {
                         checker.add_check(Check::new(
                             CheckKind::AssignmentToOsEnviron,
-                            checker.locate_check(Range::from_located(target)),
+                            Range::from_located(target),
                         ));
                     }
                 }

src/flake8_bugbear/plugins/cannot_raise_literal.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -9,7 +9,7 @@ pub fn cannot_raise_literal(checker: &mut Checker, expr: &Expr) {
     if let ExprKind::Constant { .. } = &expr.node {
         checker.add_check(Check::new(
             CheckKind::CannotRaiseLiteral,
-            checker.locate_check(Range::from_located(expr)),
+            Range::from_located(expr),
         ));
     }
 }

src/flake8_bugbear/plugins/duplicate_exceptions.rs

@@ -4,7 +4,7 @@ use itertools::Itertools;
 use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprContext, ExprKind, Stmt};
 
 use crate::ast::helpers;
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckCode, CheckKind};
@@ -47,7 +47,7 @@ pub fn duplicate_handler_exceptions(
                 CheckKind::DuplicateHandlerException(
                     duplicates.into_iter().sorted().collect::<Vec<String>>(),
                 ),
-                checker.locate_check(Range::from_located(expr)),
+                Range::from_located(expr),
             );
             if checker.patch() {
                 // TODO(charlie): If we have a single element, remove the tuple.
@@ -106,7 +106,7 @@ pub fn duplicate_exceptions(checker: &mut Checker, stmt: &Stmt, handlers: &[Exce
         for duplicate in duplicates.into_iter().sorted() {
             checker.add_check(Check::new(
                 CheckKind::DuplicateTryBlockException(duplicate),
-                checker.locate_check(Range::from_located(stmt)),
+                Range::from_located(stmt),
             ));
         }
     }

src/flake8_bugbear/plugins/function_call_argument_default.rs

@@ -1,7 +1,7 @@
 use rustpython_ast::{Arguments, Constant, Expr, ExprKind};
 
 use crate::ast::helpers::compose_call_path;
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::ast::visitor;
 use crate::ast::visitor::Visitor;
 use crate::check_ast::Checker;
@@ -91,6 +91,6 @@ pub fn function_call_argument_default(checker: &mut Checker, arguments: &Argumen
         visitor.visit_expr(expr);
     }
     for (check, range) in visitor.checks {
-        checker.add_check(Check::new(check, checker.locate_check(range)));
+        checker.add_check(Check::new(check, range));
     }
 }

src/flake8_bugbear/plugins/mutable_argument_default.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Arguments, Expr, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -45,14 +45,14 @@ pub fn mutable_argument_default(checker: &mut Checker, arguments: &Arguments) {
             | ExprKind::SetComp { .. } => {
                 checker.add_check(Check::new(
                     CheckKind::MutableArgumentDefault,
-                    checker.locate_check(Range::from_located(expr)),
+                    Range::from_located(expr),
                 ));
             }
             ExprKind::Call { func, .. } => {
                 if is_mutable_func(func) {
                     checker.add_check(Check::new(
                         CheckKind::MutableArgumentDefault,
-                        checker.locate_check(Range::from_located(expr)),
+                        Range::from_located(expr),
                     ));
                 }
             }

src/flake8_bugbear/plugins/redundant_tuple_in_exception_handler.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Excepthandler, ExcepthandlerKind, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -13,7 +13,7 @@ pub fn redundant_tuple_in_exception_handler(checker: &mut Checker, handlers: &[E
                 if elts.len() == 1 {
                     checker.add_check(Check::new(
                         CheckKind::RedundantTupleInExceptionHandler(elts[0].to_string()),
-                        checker.locate_check(Range::from_located(type_)),
+                        Range::from_located(type_),
                     ));
                 }
             }

src/flake8_bugbear/plugins/unary_prefix_increment.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind, Unaryop};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -11,7 +11,7 @@ pub fn unary_prefix_increment(checker: &mut Checker, expr: &Expr, op: &Unaryop,
             if matches!(op, Unaryop::UAdd) {
                 checker.add_check(Check::new(
                     CheckKind::UnaryPrefixIncrement,
-                    checker.locate_check(Range::from_located(expr)),
+                    Range::from_located(expr),
                 ))
             }
         }

src/flake8_bugbear/plugins/unused_loop_control_variable.rs

@@ -2,7 +2,7 @@ use std::collections::BTreeMap;
 
 use rustpython_ast::{Expr, ExprKind, Stmt};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::ast::visitor;
 use crate::ast::visitor::Visitor;
 use crate::autofix::Fix;
@@ -64,7 +64,7 @@ pub fn unused_loop_control_variable(checker: &mut Checker, target: &Expr, body:
 
         let mut check = Check::new(
             CheckKind::UnusedLoopControlVariable(name.to_string()),
-            checker.locate_check(Range::from_located(expr)),
+            Range::from_located(expr),
         );
         if checker.patch() {
             // Prefix the variable name with an underscore.

src/flake8_bugbear/plugins/useless_comparison.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -8,7 +8,7 @@ pub fn useless_comparison(checker: &mut Checker, expr: &Expr) {
     if let ExprKind::Compare { left, .. } = &expr.node {
         checker.add_check(Check::new(
             CheckKind::UselessComparison,
-            checker.locate_check(Range::from_located(left)),
+            Range::from_located(left),
         ));
     }
 }

src/flake8_bugbear/plugins/useless_expression.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Constant, ExprKind, Stmt, StmtKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
 
@@ -12,7 +12,7 @@ pub fn useless_expression(checker: &mut Checker, body: &[Stmt]) {
                 ExprKind::List { .. } | ExprKind::Dict { .. } | ExprKind::Set { .. } => {
                     checker.add_check(Check::new(
                         CheckKind::UselessExpression,
-                        checker.locate_check(Range::from_located(value)),
+                        Range::from_located(value),
                     ));
                 }
                 ExprKind::Constant { value: val, .. } => match &val {
@@ -20,7 +20,7 @@ pub fn useless_expression(checker: &mut Checker, body: &[Stmt]) {
                     _ => {
                         checker.add_check(Check::new(
                             CheckKind::UselessExpression,
-                            checker.locate_check(Range::from_located(value)),
+                            Range::from_located(value),
                         ));
                     }
                 },

src/flake8_print/plugins/print_call.rs

@@ -1,7 +1,7 @@
 use log::error;
 use rustpython_ast::{Expr, Stmt, StmtKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::helpers;
 use crate::check_ast::Checker;
 use crate::checks::CheckCode;
@@ -13,7 +13,7 @@ pub fn print_call(checker: &mut Checker, expr: &Expr, func: &Expr) {
         func,
         checker.settings.enabled.contains(&CheckCode::T201),
         checker.settings.enabled.contains(&CheckCode::T203),
-        checker.locate_check(Range::from_located(expr)),
+        Range::from_located(expr),
     ) {
         if checker.patch() {
             let context = checker.binding_context();

src/flake8_quotes/checks.rs

@@ -135,172 +135,3 @@ pub fn quotes(
 
     None
 }
-
-#[cfg(test)]
-mod tests {
-    use std::path::Path;
-
-    use anyhow::Result;
-    use rustpython_parser::lexer::LexResult;
-    use test_case::test_case;
-
-    use crate::autofix::fixer;
-    use crate::checks::{Check, CheckCode};
-    use crate::flake8_quotes::settings::Quote;
-    use crate::linter::tokenize;
-    use crate::{flake8_quotes, fs, linter, noqa, Settings, SourceCodeLocator};
-
-    fn check_path(path: &Path, settings: &Settings, autofix: &fixer::Mode) -> Result<Vec<Check>> {
-        let contents = fs::read_file(path)?;
-        let tokens: Vec<LexResult> = tokenize(&contents);
-        let locator = SourceCodeLocator::new(&contents);
-        let noqa_line_for = noqa::extract_noqa_line_for(&tokens);
-        linter::check_path(
-            path,
-            &contents,
-            tokens,
-            &locator,
-            &noqa_line_for,
-            settings,
-            autofix,
-        )
-    }
-
-    #[test_case(Path::new("doubles.py"))]
-    #[test_case(Path::new("doubles_escaped.py"))]
-    #[test_case(Path::new("doubles_multiline_string.py"))]
-    #[test_case(Path::new("doubles_noqa.py"))]
-    #[test_case(Path::new("doubles_wrapped.py"))]
-    fn doubles(path: &Path) -> Result<()> {
-        let snapshot = format!("doubles_{}", path.to_string_lossy());
-        let mut checks = check_path(
-            Path::new("./resources/test/fixtures/flake8_quotes")
-                .join(path)
-                .as_path(),
-            &Settings {
-                flake8_quotes: flake8_quotes::settings::Settings {
-                    inline_quotes: Quote::Single,
-                    multiline_quotes: Quote::Single,
-                    docstring_quotes: Quote::Single,
-                    avoid_escape: true,
-                },
-                ..Settings::for_rules(vec![
-                    CheckCode::Q000,
-                    CheckCode::Q001,
-                    CheckCode::Q002,
-                    CheckCode::Q003,
-                ])
-            },
-            &fixer::Mode::Generate,
-        )?;
-        checks.sort_by_key(|check| check.location);
-        insta::assert_yaml_snapshot!(snapshot, checks);
-        Ok(())
-    }
-
-    #[test_case(Path::new("singles.py"))]
-    #[test_case(Path::new("singles_escaped.py"))]
-    #[test_case(Path::new("singles_multiline_string.py"))]
-    #[test_case(Path::new("singles_noqa.py"))]
-    #[test_case(Path::new("singles_wrapped.py"))]
-    fn singles(path: &Path) -> Result<()> {
-        let snapshot = format!("singles_{}", path.to_string_lossy());
-        let mut checks = check_path(
-            Path::new("./resources/test/fixtures/flake8_quotes")
-                .join(path)
-                .as_path(),
-            &Settings {
-                flake8_quotes: flake8_quotes::settings::Settings {
-                    inline_quotes: Quote::Double,
-                    multiline_quotes: Quote::Double,
-                    docstring_quotes: Quote::Double,
-                    avoid_escape: true,
-                },
-                ..Settings::for_rules(vec![
-                    CheckCode::Q000,
-                    CheckCode::Q001,
-                    CheckCode::Q002,
-                    CheckCode::Q003,
-                ])
-            },
-            &fixer::Mode::Generate,
-        )?;
-        checks.sort_by_key(|check| check.location);
-        insta::assert_yaml_snapshot!(snapshot, checks);
-        Ok(())
-    }
-
-    #[test_case(Path::new("docstring_doubles.py"))]
-    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
-    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
-    #[test_case(Path::new("docstring_doubles_class.py"))]
-    #[test_case(Path::new("docstring_doubles_function.py"))]
-    #[test_case(Path::new("docstring_singles.py"))]
-    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
-    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
-    #[test_case(Path::new("docstring_singles_class.py"))]
-    #[test_case(Path::new("docstring_singles_function.py"))]
-    fn double_docstring(path: &Path) -> Result<()> {
-        let snapshot = format!("double_docstring_{}", path.to_string_lossy());
-        let mut checks = check_path(
-            Path::new("./resources/test/fixtures/flake8_quotes")
-                .join(path)
-                .as_path(),
-            &Settings {
-                flake8_quotes: flake8_quotes::settings::Settings {
-                    inline_quotes: Quote::Single,
-                    multiline_quotes: Quote::Single,
-                    docstring_quotes: Quote::Double,
-                    avoid_escape: true,
-                },
-                ..Settings::for_rules(vec![
-                    CheckCode::Q000,
-                    CheckCode::Q001,
-                    CheckCode::Q002,
-                    CheckCode::Q003,
-                ])
-            },
-            &fixer::Mode::Generate,
-        )?;
-        checks.sort_by_key(|check| check.location);
-        insta::assert_yaml_snapshot!(snapshot, checks);
-        Ok(())
-    }
-
-    #[test_case(Path::new("docstring_doubles.py"))]
-    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
-    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
-    #[test_case(Path::new("docstring_doubles_class.py"))]
-    #[test_case(Path::new("docstring_doubles_function.py"))]
-    #[test_case(Path::new("docstring_singles.py"))]
-    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
-    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
-    #[test_case(Path::new("docstring_singles_class.py"))]
-    #[test_case(Path::new("docstring_singles_function.py"))]
-    fn single_docstring(path: &Path) -> Result<()> {
-        let snapshot = format!("single_docstring_{}", path.to_string_lossy());
-        let mut checks = check_path(
-            Path::new("./resources/test/fixtures/flake8_quotes")
-                .join(path)
-                .as_path(),
-            &Settings {
-                flake8_quotes: flake8_quotes::settings::Settings {
-                    inline_quotes: Quote::Single,
-                    multiline_quotes: Quote::Double,
-                    docstring_quotes: Quote::Single,
-                    avoid_escape: true,
-                },
-                ..Settings::for_rules(vec![
-                    CheckCode::Q000,
-                    CheckCode::Q001,
-                    CheckCode::Q002,
-                    CheckCode::Q003,
-                ])
-            },
-            &fixer::Mode::Generate,
-        )?;
-        checks.sort_by_key(|check| check.location);
-        insta::assert_yaml_snapshot!(snapshot, checks);
-        Ok(())
-    }
-}

src/flake8_quotes/mod.rs

@@ -1,2 +1,171 @@
 pub mod checks;
 pub mod settings;
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    use anyhow::Result;
+    use rustpython_parser::lexer::LexResult;
+    use test_case::test_case;
+
+    use crate::autofix::fixer;
+    use crate::checks::{Check, CheckCode};
+    use crate::flake8_quotes::settings::Quote;
+    use crate::linter::tokenize;
+    use crate::{flake8_quotes, fs, linter, noqa, Settings, SourceCodeLocator};
+
+    fn check_path(path: &Path, settings: &Settings, autofix: &fixer::Mode) -> Result<Vec<Check>> {
+        let contents = fs::read_file(path)?;
+        let tokens: Vec<LexResult> = tokenize(&contents);
+        let locator = SourceCodeLocator::new(&contents);
+        let noqa_line_for = noqa::extract_noqa_line_for(&tokens);
+        linter::check_path(
+            path,
+            &contents,
+            tokens,
+            &locator,
+            &noqa_line_for,
+            settings,
+            autofix,
+        )
+    }
+
+    #[test_case(Path::new("doubles.py"))]
+    #[test_case(Path::new("doubles_escaped.py"))]
+    #[test_case(Path::new("doubles_multiline_string.py"))]
+    #[test_case(Path::new("doubles_noqa.py"))]
+    #[test_case(Path::new("doubles_wrapped.py"))]
+    fn doubles(path: &Path) -> Result<()> {
+        let snapshot = format!("doubles_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Single,
+                    docstring_quotes: Quote::Single,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("singles.py"))]
+    #[test_case(Path::new("singles_escaped.py"))]
+    #[test_case(Path::new("singles_multiline_string.py"))]
+    #[test_case(Path::new("singles_noqa.py"))]
+    #[test_case(Path::new("singles_wrapped.py"))]
+    fn singles(path: &Path) -> Result<()> {
+        let snapshot = format!("singles_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Double,
+                    multiline_quotes: Quote::Double,
+                    docstring_quotes: Quote::Double,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("docstring_doubles.py"))]
+    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_doubles_class.py"))]
+    #[test_case(Path::new("docstring_doubles_function.py"))]
+    #[test_case(Path::new("docstring_singles.py"))]
+    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_singles_class.py"))]
+    #[test_case(Path::new("docstring_singles_function.py"))]
+    fn double_docstring(path: &Path) -> Result<()> {
+        let snapshot = format!("double_docstring_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Single,
+                    docstring_quotes: Quote::Double,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+
+    #[test_case(Path::new("docstring_doubles.py"))]
+    #[test_case(Path::new("docstring_doubles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_doubles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_doubles_class.py"))]
+    #[test_case(Path::new("docstring_doubles_function.py"))]
+    #[test_case(Path::new("docstring_singles.py"))]
+    #[test_case(Path::new("docstring_singles_module_multiline.py"))]
+    #[test_case(Path::new("docstring_singles_module_singleline.py"))]
+    #[test_case(Path::new("docstring_singles_class.py"))]
+    #[test_case(Path::new("docstring_singles_function.py"))]
+    fn single_docstring(path: &Path) -> Result<()> {
+        let snapshot = format!("single_docstring_{}", path.to_string_lossy());
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/flake8_quotes")
+                .join(path)
+                .as_path(),
+            &Settings {
+                flake8_quotes: flake8_quotes::settings::Settings {
+                    inline_quotes: Quote::Single,
+                    multiline_quotes: Quote::Double,
+                    docstring_quotes: Quote::Single,
+                    avoid_escape: true,
+                },
+                ..Settings::for_rules(vec![
+                    CheckCode::Q000,
+                    CheckCode::Q001,
+                    CheckCode::Q002,
+                    CheckCode::Q003,
+                ])
+            },
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(snapshot, checks);
+        Ok(())
+    }
+}

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_doubles.py.snap

@@ -0,0 +1,50 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 5
+    column: 0
+  end_location:
+    row: 7
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 16
+    column: 4
+  end_location:
+    row: 18
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 21
+    column: 20
+  end_location:
+    row: 22
+    column: 37
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 30
+    column: 8
+  end_location:
+    row: 32
+    column: 11
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 35
+    column: 12
+  end_location:
+    row: 37
+    column: 15
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_doubles_class.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 27
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 5
+    column: 22
+  end_location:
+    row: 5
+    column: 43
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_doubles_function.py.snap

@@ -0,0 +1,50 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 11
+    column: 4
+  end_location:
+    row: 11
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 15
+    column: 38
+  end_location:
+    row: 17
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 17
+    column: 4
+  end_location:
+    row: 17
+    column: 19
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 21
+    column: 4
+  end_location:
+    row: 21
+    column: 27
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_doubles_module_multiline.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 4
+    column: 0
+  end_location:
+    row: 6
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 9
+    column: 0
+  end_location:
+    row: 11
+    column: 3
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_doubles_module_singleline.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 2
+    column: 0
+  end_location:
+    row: 2
+    column: 31
+  fix: ~
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 6
+    column: 0
+  end_location:
+    row: 6
+    column: 31
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_singles.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 14
+    column: 4
+  end_location:
+    row: 16
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 26
+    column: 8
+  end_location:
+    row: 28
+    column: 11
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_singles_class.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 2
+    column: 4
+  end_location:
+    row: 2
+    column: 53
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 6
+    column: 8
+  end_location:
+    row: 6
+    column: 57
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 9
+    column: 28
+  end_location:
+    row: 9
+    column: 52
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_singles_function.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 2
+    column: 4
+  end_location:
+    row: 2
+    column: 56
+  fix: ~
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 8
+    column: 4
+  end_location:
+    row: 10
+    column: 7
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_singles_module_multiline.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 3
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__double_docstring_docstring_singles_module_singleline.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: double
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 1
+    column: 49
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__doubles_doubles.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesInlineString: single
+  location:
+    row: 1
+    column: 24
+  end_location:
+    row: 1
+    column: 45
+  fix: ~
+- kind:
+    BadQuotesInlineString: single
+  location:
+    row: 2
+    column: 24
+  end_location:
+    row: 2
+    column: 46
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__doubles_doubles_escaped.py.snap

@@ -0,0 +1,13 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind: AvoidQuoteEscape
+  location:
+    row: 1
+    column: 25
+  end_location:
+    row: 1
+    column: 47
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__doubles_doubles_multiline_string.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: single
+  location:
+    row: 1
+    column: 4
+  end_location:
+    row: 3
+    column: 12
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__doubles_doubles_noqa.py.snap

@@ -0,0 +1,6 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+[]
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__doubles_doubles_wrapped.py.snap

@@ -0,0 +1,6 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+[]
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_doubles.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 12
+    column: 4
+  end_location:
+    row: 14
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 24
+    column: 8
+  end_location:
+    row: 26
+    column: 11
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_doubles_class.py.snap

@@ -0,0 +1,32 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 2
+    column: 4
+  end_location:
+    row: 2
+    column: 53
+  fix: ~
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 6
+    column: 8
+  end_location:
+    row: 6
+    column: 57
+  fix: ~
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 9
+    column: 28
+  end_location:
+    row: 9
+    column: 52
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_doubles_function.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 2
+    column: 4
+  end_location:
+    row: 2
+    column: 56
+  fix: ~
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 8
+    column: 4
+  end_location:
+    row: 10
+    column: 7
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_doubles_module_multiline.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 3
+    column: 3
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_doubles_module_singleline.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesDocstring: single
+  location:
+    row: 1
+    column: 0
+  end_location:
+    row: 1
+    column: 49
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_singles.py.snap

@@ -0,0 +1,59 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 5
+    column: 0
+  end_location:
+    row: 7
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 11
+    column: 20
+  end_location:
+    row: 13
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 18
+    column: 4
+  end_location:
+    row: 20
+    column: 7
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 23
+    column: 20
+  end_location:
+    row: 24
+    column: 37
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 32
+    column: 8
+  end_location:
+    row: 34
+    column: 11
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 37
+    column: 12
+  end_location:
+    row: 39
+    column: 15
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_singles_class.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 27
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 5
+    column: 22
+  end_location:
+    row: 5
+    column: 43
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_singles_function.py.snap

@@ -0,0 +1,50 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 3
+    column: 4
+  end_location:
+    row: 3
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 11
+    column: 4
+  end_location:
+    row: 11
+    column: 26
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 15
+    column: 38
+  end_location:
+    row: 17
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 17
+    column: 4
+  end_location:
+    row: 17
+    column: 19
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 21
+    column: 4
+  end_location:
+    row: 21
+    column: 27
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_singles_module_multiline.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 4
+    column: 0
+  end_location:
+    row: 6
+    column: 3
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 9
+    column: 0
+  end_location:
+    row: 11
+    column: 3
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__single_docstring_docstring_singles_module_singleline.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 2
+    column: 0
+  end_location:
+    row: 2
+    column: 31
+  fix: ~
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 6
+    column: 0
+  end_location:
+    row: 6
+    column: 31
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__singles_singles.py.snap

@@ -0,0 +1,23 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesInlineString: double
+  location:
+    row: 1
+    column: 24
+  end_location:
+    row: 1
+    column: 45
+  fix: ~
+- kind:
+    BadQuotesInlineString: double
+  location:
+    row: 2
+    column: 24
+  end_location:
+    row: 2
+    column: 46
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__singles_singles_escaped.py.snap

@@ -0,0 +1,13 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind: AvoidQuoteEscape
+  location:
+    row: 1
+    column: 25
+  end_location:
+    row: 1
+    column: 47
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__singles_singles_multiline_string.py.snap

@@ -0,0 +1,14 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+- kind:
+    BadQuotesMultilineString: double
+  location:
+    row: 1
+    column: 4
+  end_location:
+    row: 3
+    column: 12
+  fix: ~
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__singles_singles_noqa.py.snap

@@ -0,0 +1,6 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+[]
+

src/flake8_quotes/snapshots/ruff__flake8_quotes__tests__singles_singles_wrapped.py.snap

@@ -0,0 +1,6 @@
+---
+source: src/flake8_quotes/mod.rs
+expression: checks
+---
+[]
+

src/lib.rs

@@ -25,6 +25,7 @@ pub mod cli;
 pub mod code_gen;
 mod cst;
 mod docstrings;
+pub mod flake8_annotations;
 mod flake8_bugbear;
 mod flake8_builtins;
 mod flake8_comprehensions;

src/main.rs

@@ -1,4 +1,3 @@
-use std::collections::BTreeMap;
 use std::io::{self, Read};
 use std::path::{Path, PathBuf};
 use std::process::ExitCode;
@@ -8,7 +7,6 @@ use std::time::Instant;
 #[cfg(not(target_family = "wasm"))]
 use ::ruff::cache;
 use ::ruff::checks::{CheckCode, CheckKind};
-use ::ruff::checks_gen::CheckCodePrefix;
 use ::ruff::cli::{collect_per_file_ignores, extract_log_level, warn_on, Cli, Warnable};
 use ::ruff::fs::iter_python_files;
 use ::ruff::linter::{add_noqa_to_path, autoformat_path, lint_path, lint_stdin};
@@ -252,8 +250,6 @@ fn inner_main() -> Result<ExitCode> {
         .iter()
         .map(|path| FilePattern::from_user(path, &project_root))
         .collect();
-    let per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>> =
-        collect_per_file_ignores(cli.per_file_ignores);
 
     let mut configuration = Configuration::from_pyproject(&pyproject, &project_root)?;
     if !exclude.is_empty() {
@@ -262,8 +258,9 @@ fn inner_main() -> Result<ExitCode> {
     if !extend_exclude.is_empty() {
         configuration.extend_exclude = extend_exclude;
     }
-    if !per_file_ignores.is_empty() {
-        configuration.per_file_ignores = per_file_ignores;
+    if !cli.per_file_ignores.is_empty() {
+        configuration.per_file_ignores =
+            collect_per_file_ignores(cli.per_file_ignores, &project_root);
     }
     if !cli.select.is_empty() {
         warn_on(

src/pycodestyle/checks.rs

@@ -2,7 +2,7 @@ use itertools::izip;
 use rustpython_ast::Location;
 use rustpython_parser::ast::{Cmpop, Constant, Expr, ExprKind, Unaryop};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::checks::{Check, CheckKind, RejectedCmpop};
 use crate::source_code_locator::SourceCodeLocator;
 
@@ -61,7 +61,6 @@ pub fn not_tests(
     operand: &Expr,
     check_not_in: bool,
     check_not_is: bool,
-    locator: &dyn CheckLocator,
 ) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
@@ -73,7 +72,7 @@ pub fn not_tests(
                         if check_not_in {
                             checks.push(Check::new(
                                 CheckKind::NotInTest,
-                                locator.locate_check(Range::from_located(operand)),
+                                Range::from_located(operand),
                             ));
                         }
                     }
@@ -81,7 +80,7 @@ pub fn not_tests(
                         if check_not_is {
                             checks.push(Check::new(
                                 CheckKind::NotIsTest,
-                                locator.locate_check(Range::from_located(operand)),
+                                Range::from_located(operand),
                             ));
                         }
                     }
@@ -101,7 +100,6 @@ pub fn literal_comparisons(
     comparators: &[Expr],
     check_none_comparisons: bool,
     check_true_false_comparisons: bool,
-    locator: &dyn CheckLocator,
 ) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
@@ -121,13 +119,13 @@ pub fn literal_comparisons(
         if matches!(op, Cmpop::Eq) {
             checks.push(Check::new(
                 CheckKind::NoneComparison(RejectedCmpop::Eq),
-                locator.locate_check(Range::from_located(comparator)),
+                Range::from_located(comparator),
             ));
         }
         if matches!(op, Cmpop::NotEq) {
             checks.push(Check::new(
                 CheckKind::NoneComparison(RejectedCmpop::NotEq),
-                locator.locate_check(Range::from_located(comparator)),
+                Range::from_located(comparator),
             ));
         }
     }
@@ -141,13 +139,13 @@ pub fn literal_comparisons(
             if matches!(op, Cmpop::Eq) {
                 checks.push(Check::new(
                     CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
-                    locator.locate_check(Range::from_located(comparator)),
+                    Range::from_located(comparator),
                 ));
             }
             if matches!(op, Cmpop::NotEq) {
                 checks.push(Check::new(
                     CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
-                    locator.locate_check(Range::from_located(comparator)),
+                    Range::from_located(comparator),
                 ));
             }
         }
@@ -167,13 +165,13 @@ pub fn literal_comparisons(
             if matches!(op, Cmpop::Eq) {
                 checks.push(Check::new(
                     CheckKind::NoneComparison(RejectedCmpop::Eq),
-                    locator.locate_check(Range::from_located(comparator)),
+                    Range::from_located(comparator),
                 ));
             }
             if matches!(op, Cmpop::NotEq) {
                 checks.push(Check::new(
                     CheckKind::NoneComparison(RejectedCmpop::NotEq),
-                    locator.locate_check(Range::from_located(comparator)),
+                    Range::from_located(comparator),
                 ));
             }
         }
@@ -187,13 +185,13 @@ pub fn literal_comparisons(
                 if matches!(op, Cmpop::Eq) {
                     checks.push(Check::new(
                         CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
-                        locator.locate_check(Range::from_located(comparator)),
+                        Range::from_located(comparator),
                     ));
                 }
                 if matches!(op, Cmpop::NotEq) {
                     checks.push(Check::new(
                         CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
-                        locator.locate_check(Range::from_located(comparator)),
+                        Range::from_located(comparator),
                     ));
                 }
             }

src/pydocstyle/plugins.rs

@@ -13,7 +13,7 @@ use crate::docstrings::definition::{Definition, DefinitionKind};
 use crate::docstrings::helpers;
 use crate::docstrings::sections::{section_contexts, SectionContext};
 use crate::docstrings::styles::SectionStyle;
-use crate::visibility::{is_init, is_magic, is_overload, is_static, Visibility};
+use crate::visibility::{is_init, is_magic, is_overload, is_staticmethod, Visibility};
 
 /// D100, D101, D102, D103, D104, D105, D106, D107
 pub fn not_missing(
@@ -1308,7 +1308,8 @@ fn missing_args(checker: &mut Checker, definition: &Definition, docstrings_args:
                 .skip(
                     // If this is a non-static method, skip `cls` or `self`.
                     usize::from(
-                        matches!(definition.kind, DefinitionKind::Method(_)) && !is_static(parent),
+                        matches!(definition.kind, DefinitionKind::Method(_))
+                            && !is_staticmethod(parent),
                     ),
                 )
                 .collect();

src/pyflakes/checks.rs

@@ -5,7 +5,7 @@ use rustpython_parser::ast::{
     Arg, Arguments, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprKind, Stmt, StmtKind,
 };
 
-use crate::ast::types::{BindingKind, CheckLocator, FunctionScope, Range, Scope, ScopeKind};
+use crate::ast::types::{BindingKind, FunctionScope, Range, Scope, ScopeKind};
 use crate::checks::{Check, CheckKind};
 
 /// F631
@@ -28,12 +28,30 @@ pub fn if_tuple(test: &Expr, location: Range) -> Option<Check> {
     None
 }
 
+/// F821
+pub fn undefined_local(scopes: &[&Scope], name: &str) -> 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((scope_id, location)) = binding.used {
+                        if scope_id == current.id {
+                            return Some(Check::new(
+                                CheckKind::UndefinedLocal(name.to_string()),
+                                location,
+                            ));
+                        }
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+
 /// F841
-pub fn unused_variables(
-    scope: &Scope,
-    locator: &dyn CheckLocator,
-    dummy_variable_rgx: &Regex,
-) -> Vec<Check> {
+pub fn unused_variables(scope: &Scope, dummy_variable_rgx: &Regex) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
     if matches!(
@@ -53,7 +71,7 @@ pub fn unused_variables(
         {
             checks.push(Check::new(
                 CheckKind::UnusedVariable(name.to_string()),
-                locator.locate_check(binding.range),
+                binding.range,
             ));
         }
     }
@@ -129,7 +147,6 @@ pub fn repeated_keys(
     keys: &[Expr],
     check_repeated_literals: bool,
     check_repeated_variables: bool,
-    locator: &dyn CheckLocator,
 ) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
@@ -144,7 +161,7 @@ pub fn repeated_keys(
                     if check_repeated_literals && v1 == v2 {
                         checks.push(Check::new(
                             CheckKind::MultiValueRepeatedKeyLiteral,
-                            locator.locate_check(Range::from_located(k2)),
+                            Range::from_located(k2),
                         ))
                     }
                 }
@@ -152,7 +169,7 @@ pub fn repeated_keys(
                     if check_repeated_variables && v1 == v2 {
                         checks.push(Check::new(
                             CheckKind::MultiValueRepeatedKeyVariable((*v2).to_string()),
-                            locator.locate_check(Range::from_located(k2)),
+                            Range::from_located(k2),
                         ))
                     }
                 }
@@ -195,12 +212,7 @@ pub fn starred_expressions(
 }
 
 /// F701
-pub fn break_outside_loop(
-    stmt: &Stmt,
-    parents: &[&Stmt],
-    parent_stack: &[usize],
-    locator: &dyn CheckLocator,
-) -> Option<Check> {
+pub fn break_outside_loop(stmt: &Stmt, parents: &[&Stmt], parent_stack: &[usize]) -> Option<Check> {
     let mut allowed: bool = false;
     let mut parent = stmt;
     for index in parent_stack.iter().rev() {
@@ -228,7 +240,7 @@ pub fn break_outside_loop(
     if !allowed {
         Some(Check::new(
             CheckKind::BreakOutsideLoop,
-            locator.locate_check(Range::from_located(stmt)),
+            Range::from_located(stmt),
         ))
     } else {
         None
@@ -240,7 +252,6 @@ pub fn continue_outside_loop(
     stmt: &Stmt,
     parents: &[&Stmt],
     parent_stack: &[usize],
-    locator: &dyn CheckLocator,
 ) -> Option<Check> {
     let mut allowed: bool = false;
     let mut parent = stmt;
@@ -269,7 +280,7 @@ pub fn continue_outside_loop(
     if !allowed {
         Some(Check::new(
             CheckKind::ContinueOutsideLoop,
-            locator.locate_check(Range::from_located(stmt)),
+            Range::from_located(stmt),
         ))
     } else {
         None

src/pyflakes/plugins/assert_tuple.rs

@@ -1,13 +1,12 @@
 use rustpython_ast::{Expr, Stmt};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::pyflakes::checks;
 
 /// F631
 pub fn assert_tuple(checker: &mut Checker, stmt: &Stmt, test: &Expr) {
-    if let Some(check) = checks::assert_tuple(test, checker.locate_check(Range::from_located(stmt)))
-    {
+    if let Some(check) = checks::assert_tuple(test, Range::from_located(stmt)) {
         checker.add_check(check);
     }
 }

src/pyflakes/plugins/if_tuple.rs

@@ -1,12 +1,12 @@
 use rustpython_ast::{Expr, Stmt};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::check_ast::Checker;
 use crate::pyflakes::checks;
 
 /// F634
 pub fn if_tuple(checker: &mut Checker, stmt: &Stmt, test: &Expr) {
-    if let Some(check) = checks::if_tuple(test, checker.locate_check(Range::from_located(stmt))) {
+    if let Some(check) = checks::if_tuple(test, Range::from_located(stmt)) {
         checker.add_check(check);
     }
 }

src/pyflakes/plugins/raise_not_implemented.rs

@@ -1,6 +1,6 @@
 use rustpython_ast::{Expr, ExprKind};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::checks::{Check, CheckKind};
@@ -27,10 +27,7 @@ fn match_not_implemented(expr: &Expr) -> Option<&Expr> {
 /// F901
 pub fn raise_not_implemented(checker: &mut Checker, expr: &Expr) {
     if let Some(expr) = match_not_implemented(expr) {
-        let mut check = Check::new(
-            CheckKind::RaiseNotImplemented,
-            checker.locate_check(Range::from_located(expr)),
-        );
+        let mut check = Check::new(CheckKind::RaiseNotImplemented, Range::from_located(expr));
         if checker.patch() {
             check.amend(Fix::replacement(
                 "NotImplementedError".to_string(),

src/python/typing.rs

@@ -175,7 +175,6 @@ static IMPORTED_SUBSCRIPTS: Lazy<BTreeMap<&'static str, BTreeSet<&'static str>>>
             ("Counter", "typing_extensions"),
             ("DefaultDict", "typing_extensions"),
             ("Deque", "typing_extensions"),
-            ("Literal", "typing_extensions"),
             ("Type", "typing_extensions"),
             // `weakref`
             ("WeakKeyDictionary", "weakref"),

src/pyupgrade/plugins/type_of_primitive.rs

@@ -1,15 +1,13 @@
 use rustpython_ast::Expr;
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::checks::CheckKind;
 use crate::pyupgrade::checks;
 
 pub fn type_of_primitive(checker: &mut Checker, expr: &Expr, func: &Expr, args: &[Expr]) {
-    if let Some(mut check) =
-        checks::type_of_primitive(func, args, checker.locate_check(Range::from_located(expr)))
-    {
+    if let Some(mut check) = checks::type_of_primitive(func, args, Range::from_located(expr)) {
         if checker.patch() {
             if let CheckKind::TypeOfPrimitive(primitive) = &check.kind {
                 check.amend(Fix::replacement(

src/pyupgrade/plugins/unnecessary_abspath.rs

@@ -1,14 +1,12 @@
 use rustpython_ast::Expr;
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::Fix;
 use crate::check_ast::Checker;
 use crate::pyupgrade::checks;
 
 pub fn unnecessary_abspath(checker: &mut Checker, expr: &Expr, func: &Expr, args: &[Expr]) {
-    if let Some(mut check) =
-        checks::unnecessary_abspath(func, args, checker.locate_check(Range::from_located(expr)))
-    {
+    if let Some(mut check) = checks::unnecessary_abspath(func, args, Range::from_located(expr)) {
         if checker.patch() {
             check.amend(Fix::replacement(
                 "__file__".to_string(),

src/pyupgrade/plugins/useless_metaclass_type.rs

@@ -1,17 +1,15 @@
 use log::error;
 use rustpython_ast::{Expr, Stmt};
 
-use crate::ast::types::{CheckLocator, Range};
+use crate::ast::types::Range;
 use crate::autofix::helpers;
 use crate::check_ast::Checker;
 use crate::pyupgrade::checks;
 
 pub fn useless_metaclass_type(checker: &mut Checker, stmt: &Stmt, value: &Expr, targets: &[Expr]) {
-    if let Some(mut check) = checks::useless_metaclass_type(
-        targets,
-        value,
-        checker.locate_check(Range::from_located(stmt)),
-    ) {
+    if let Some(mut check) =
+        checks::useless_metaclass_type(targets, value, Range::from_located(stmt))
+    {
         if checker.patch() {
             let context = checker.binding_context();
             let deleted: Vec<&Stmt> = checker

src/settings/configuration.rs

@@ -2,7 +2,6 @@
 //! command-line options. Structure mirrors the user-facing representation of
 //! the various parameters.
 
-use std::collections::BTreeMap;
 use std::path::PathBuf;
 
 use anyhow::{anyhow, Result};
@@ -11,8 +10,8 @@ use regex::Regex;
 
 use crate::checks_gen::CheckCodePrefix;
 use crate::settings::pyproject::load_options;
-use crate::settings::types::{FilePattern, PythonVersion};
-use crate::{flake8_quotes, pep8_naming};
+use crate::settings::types::{FilePattern, PerFileIgnore, PythonVersion};
+use crate::{flake8_annotations, flake8_quotes, pep8_naming};
 
 #[derive(Debug)]
 pub struct Configuration {
@@ -23,10 +22,11 @@ pub struct Configuration {
     pub extend_select: Vec<CheckCodePrefix>,
     pub ignore: Vec<CheckCodePrefix>,
     pub line_length: usize,
-    pub per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>>,
+    pub per_file_ignores: Vec<PerFileIgnore>,
     pub select: Vec<CheckCodePrefix>,
     pub target_version: PythonVersion,
     // Plugins
+    pub flake8_annotations: flake8_annotations::settings::Settings,
     pub flake8_quotes: flake8_quotes::settings::Settings,
     pub pep8_naming: pep8_naming::settings::Settings,
 }
@@ -93,8 +93,22 @@ impl Configuration {
             extend_select: options.extend_select.unwrap_or_default(),
             ignore: options.ignore.unwrap_or_default(),
             line_length: options.line_length.unwrap_or(88),
-            per_file_ignores: options.per_file_ignores.unwrap_or_default(),
+            per_file_ignores: options
+                .per_file_ignores
+                .map(|per_file_ignores| {
+                    per_file_ignores
+                        .iter()
+                        .map(|(pattern, prefixes)| {
+                            PerFileIgnore::new(pattern, prefixes, project_root)
+                        })
+                        .collect()
+                })
+                .unwrap_or_default(),
             // Plugins
+            flake8_annotations: options
+                .flake8_annotations
+                .map(flake8_annotations::settings::Settings::from_options)
+                .unwrap_or_default(),
             flake8_quotes: options
                 .flake8_quotes
                 .map(flake8_quotes::settings::Settings::from_options)

src/settings/mod.rs

@@ -2,7 +2,7 @@
 //! command-line options. Structure is optimized for internal usage, as opposed
 //! to external visibility or parsing.
 
-use std::collections::{BTreeMap, BTreeSet};
+use std::collections::BTreeSet;
 use std::hash::{Hash, Hasher};
 
 use regex::Regex;
@@ -11,7 +11,7 @@ use crate::checks::CheckCode;
 use crate::checks_gen::{CheckCodePrefix, PrefixSpecificity};
 use crate::settings::configuration::Configuration;
 use crate::settings::types::{FilePattern, PerFileIgnore, PythonVersion};
-use crate::{flake8_quotes, pep8_naming};
+use crate::{flake8_annotations, flake8_quotes, pep8_naming};
 
 pub mod configuration;
 pub mod options;
@@ -29,6 +29,7 @@ pub struct Settings {
     pub per_file_ignores: Vec<PerFileIgnore>,
     pub target_version: PythonVersion,
     // Plugins
+    pub flake8_annotations: flake8_annotations::settings::Settings,
     pub flake8_quotes: flake8_quotes::settings::Settings,
     pub pep8_naming: pep8_naming::settings::Settings,
 }
@@ -45,10 +46,11 @@ impl Settings {
             ),
             exclude: config.exclude,
             extend_exclude: config.extend_exclude,
+            flake8_annotations: config.flake8_annotations,
             flake8_quotes: config.flake8_quotes,
             line_length: config.line_length,
             pep8_naming: config.pep8_naming,
-            per_file_ignores: resolve_per_file_ignores(&config.per_file_ignores),
+            per_file_ignores: config.per_file_ignores,
             target_version: config.target_version,
         }
     }
@@ -62,6 +64,7 @@ impl Settings {
             line_length: 88,
             per_file_ignores: Default::default(),
             target_version: PythonVersion::Py310,
+            flake8_annotations: Default::default(),
             flake8_quotes: Default::default(),
             pep8_naming: Default::default(),
         }
@@ -76,6 +79,7 @@ impl Settings {
             line_length: 88,
             per_file_ignores: Default::default(),
             target_version: PythonVersion::Py310,
+            flake8_annotations: Default::default(),
             flake8_quotes: Default::default(),
             pep8_naming: Default::default(),
         }
@@ -95,6 +99,7 @@ impl Hash for Settings {
         }
         self.target_version.hash(state);
         // Add plugin properties in alphabetical order.
+        self.flake8_annotations.hash(state);
         self.flake8_quotes.hash(state);
         self.pep8_naming.hash(state);
     }
@@ -143,15 +148,6 @@ fn resolve_codes(
     codes
 }
 
-fn resolve_per_file_ignores(
-    per_file_ignores: &BTreeMap<String, Vec<CheckCodePrefix>>,
-) -> Vec<PerFileIgnore> {
-    per_file_ignores
-        .iter()
-        .map(|(pattern, prefixes)| PerFileIgnore::new(pattern, prefixes, &None))
-        .collect()
-}
-
 #[cfg(test)]
 mod tests {
     use std::collections::BTreeSet;

src/settings/options.rs

@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::checks_gen::CheckCodePrefix;
 use crate::settings::types::PythonVersion;
-use crate::{flake8_quotes, pep8_naming};
+use crate::{flake8_annotations, flake8_quotes, pep8_naming};
 
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
@@ -22,6 +22,7 @@ pub struct Options {
     pub dummy_variable_rgx: Option<String>,
     pub target_version: Option<PythonVersion>,
     // Plugins
+    pub flake8_annotations: Option<flake8_annotations::settings::Options>,
     pub flake8_quotes: Option<flake8_quotes::settings::Options>,
     pub pep8_naming: Option<pep8_naming::settings::Options>,
 }

src/settings/pyproject.rs

@@ -143,6 +143,7 @@ mod tests {
                     per_file_ignores: None,
                     dummy_variable_rgx: None,
                     target_version: None,
+                    flake8_annotations: None,
                     flake8_quotes: None,
                     pep8_naming: None,
                 })
@@ -170,6 +171,7 @@ line-length = 79
                     per_file_ignores: None,
                     dummy_variable_rgx: None,
                     target_version: None,
+                    flake8_annotations: None,
                     flake8_quotes: None,
                     pep8_naming: None,
                 })
@@ -197,6 +199,7 @@ exclude = ["foo.py"]
                     per_file_ignores: None,
                     dummy_variable_rgx: None,
                     target_version: None,
+                    flake8_annotations: None,
                     flake8_quotes: None,
                     pep8_naming: None,
                 })
@@ -224,6 +227,7 @@ select = ["E501"]
                     per_file_ignores: None,
                     dummy_variable_rgx: None,
                     target_version: None,
+                    flake8_annotations: None,
                     flake8_quotes: None,
                     pep8_naming: None,
                 })
@@ -252,6 +256,7 @@ ignore = ["E501"]
                     per_file_ignores: None,
                     dummy_variable_rgx: None,
                     target_version: None,
+                    flake8_annotations: None,
                     flake8_quotes: None,
                     pep8_naming: None,
                 })
@@ -326,6 +331,7 @@ other-attribute = 1
                 ),])),
                 dummy_variable_rgx: None,
                 target_version: None,
+                flake8_annotations: None,
                 flake8_quotes: Some(flake8_quotes::settings::Options {
                     inline_quotes: Some(Quote::Single),
                     multiline_quotes: Some(Quote::Double),

src/settings/user.rs

@@ -1,13 +1,13 @@
 //! Structs to render user-facing settings.
 
-use std::collections::BTreeMap;
 use std::path::PathBuf;
 
 use regex::Regex;
 
+use crate::checks::CheckCode;
 use crate::checks_gen::CheckCodePrefix;
 use crate::settings::types::{FilePattern, PythonVersion};
-use crate::{flake8_quotes, pep8_naming, Configuration};
+use crate::{flake8_annotations, flake8_quotes, pep8_naming, Configuration};
 
 /// Struct to render user-facing exclusion patterns.
 #[derive(Debug)]
@@ -42,10 +42,11 @@ pub struct UserConfiguration {
     pub extend_select: Vec<CheckCodePrefix>,
     pub ignore: Vec<CheckCodePrefix>,
     pub line_length: usize,
-    pub per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>>,
+    pub per_file_ignores: Vec<(Exclusion, Vec<CheckCode>)>,
     pub select: Vec<CheckCodePrefix>,
     pub target_version: PythonVersion,
     // Plugins
+    pub flake8_annotations: flake8_annotations::settings::Settings,
     pub flake8_quotes: flake8_quotes::settings::Settings,
     pub pep8_naming: pep8_naming::settings::Settings,
     // Non-settings exposed to the user
@@ -75,9 +76,19 @@ impl UserConfiguration {
             extend_select: configuration.extend_select,
             ignore: configuration.ignore,
             line_length: configuration.line_length,
-            per_file_ignores: configuration.per_file_ignores,
+            per_file_ignores: configuration
+                .per_file_ignores
+                .into_iter()
+                .map(|per_file_ignore| {
+                    (
+                        Exclusion::from_file_pattern(per_file_ignore.pattern),
+                        Vec::from_iter(per_file_ignore.codes),
+                    )
+                })
+                .collect(),
             select: configuration.select,
             target_version: configuration.target_version,
+            flake8_annotations: configuration.flake8_annotations,
             flake8_quotes: configuration.flake8_quotes,
             pep8_naming: configuration.pep8_naming,
             project_root,

src/visibility.rs

@@ -28,13 +28,24 @@ pub struct VisibleScope {
 }
 
 /// Returns `true` if a function is a "static method".
-pub fn is_static(stmt: &Stmt) -> bool {
+pub fn is_staticmethod(stmt: &Stmt) -> bool {
     match &stmt.node {
         StmtKind::FunctionDef { decorator_list, .. }
         | StmtKind::AsyncFunctionDef { decorator_list, .. } => decorator_list
             .iter()
             .any(|expr| match_name_or_attr(expr, "staticmethod")),
-        _ => panic!("Found non-FunctionDef in is_overload"),
+        _ => panic!("Found non-FunctionDef in is_staticmethod"),
+    }
+}
+
+/// Returns `true` if a function is a "class method".
+pub fn is_classmethod(stmt: &Stmt) -> bool {
+    match &stmt.node {
+        StmtKind::FunctionDef { decorator_list, .. }
+        | StmtKind::AsyncFunctionDef { decorator_list, .. } => decorator_list
+            .iter()
+            .any(|expr| match_name_or_attr(expr, "classmethod")),
+        _ => panic!("Found non-FunctionDef in is_classmethod"),
     }
 }