Bump version to 0.0.99

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.98
+    rev: v0.0.99
     hooks:
       - id: ruff
 

Cargo.lock

@@ -920,7 +920,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8-to-ruff"
-version = "0.0.98-dev.0"
+version = "0.0.99-dev.0"
 dependencies = [
  "anyhow",
  "clap 4.0.15",
@@ -2211,7 +2211,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.98"
+version = "0.0.99"
 dependencies = [
  "anyhow",
  "assert_cmd",

Cargo.toml

@@ -5,7 +5,7 @@ members = [
 
 [package]
 name = "ruff"
-version = "0.0.98"
+version = "0.0.99"
 edition = "2021"
 
 [lib]

README.md

@@ -89,7 +89,7 @@ Ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.98
+    rev: v0.0.99
     hooks:
       - id: ruff
 ```
@@ -445,7 +445,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) | 🛠 |
 | C404 | UnnecessaryListComprehensionDict | Unnecessary `list` comprehension (rewrite as a `dict` comprehension) |  |
 | C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) | 🛠 |
-| C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) |  |
+| C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) | 🛠 |
 | C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) | 🛠 |
 | C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) | 🛠 |
 | C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) | 🛠 |
@@ -453,7 +453,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | C413 | UnnecessaryCallAroundSorted | Unnecessary `(list\|reversed)` call around `sorted()` |  |
 | C414 | UnnecessaryDoubleCastOrProcess | Unnecessary `(list\|reversed\|set\|sorted\|tuple)` call within `(list\|set\|sorted\|tuple)()` |  |
 | C415 | UnnecessarySubscriptReversal | Unnecessary subscript reversal of iterable within `(reversed\|set\|sorted)()` |  |
-| C416 | UnnecessaryComprehension | Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) |  |
+| C416 | UnnecessaryComprehension | Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) | 🛠 |
 | C417 | UnnecessaryMap | Unnecessary `map` usage (rewrite using a `(list\|set\|dict)` comprehension) |  |
 
 ### flake8-bugbear

flake8_to_ruff/Cargo.lock

@@ -771,7 +771,7 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flake8_to_ruff"
-version = "0.0.98"
+version = "0.0.99"
 dependencies = [
  "anyhow",
  "clap",
@@ -1975,7 +1975,7 @@ dependencies = [
 
 [[package]]
 name = "ruff"
-version = "0.0.98"
+version = "0.0.99"
 dependencies = [
  "anyhow",
  "bincode",

flake8_to_ruff/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "flake8-to-ruff"
-version = "0.0.98-dev.0"
+version = "0.0.99-dev.0"
 edition = "2021"
 
 [lib]

src/check_ast.rs

@@ -1076,9 +1076,12 @@ where
 
                 if self.settings.enabled.contains(&CheckCode::C406) {
                     if let Some(check) = flake8_comprehensions::checks::unnecessary_literal_dict(
+                        expr,
                         func,
                         args,
                         keywords,
+                        self.locator,
+                        self.patch(),
                         self.locate_check(Range::from_located(expr)),
                     ) {
                         self.checks.push(check);
@@ -1363,6 +1366,8 @@ where
                         expr,
                         elt,
                         generators,
+                        self.locator,
+                        self.patch(),
                         self.locate_check(Range::from_located(expr)),
                     ) {
                         self.checks.push(check);

src/checks.rs

@@ -1470,11 +1470,13 @@ impl CheckKind {
                 | CheckKind::TypeOfPrimitive(_)
                 | CheckKind::UnnecessaryAbspath
                 | CheckKind::UnnecessaryCollectionCall(_)
+                | CheckKind::UnnecessaryComprehension(_)
                 | CheckKind::UnnecessaryGeneratorDict
                 | CheckKind::UnnecessaryGeneratorList
                 | CheckKind::UnnecessaryGeneratorSet
                 | CheckKind::UnnecessaryListCall
                 | CheckKind::UnnecessaryListComprehensionSet
+                | CheckKind::UnnecessaryLiteralDict(_)
                 | CheckKind::UnnecessaryLiteralSet(_)
                 | CheckKind::UnnecessaryLiteralWithinListCall(_)
                 | CheckKind::UnnecessaryLiteralWithinTupleCall(_)

src/flake8_comprehensions/checks.rs

@@ -197,9 +197,12 @@ pub fn unnecessary_literal_set(
 
 /// C406 (`dict([(1, 2)])`)
 pub fn unnecessary_literal_dict(
+    expr: &Expr,
     func: &Expr,
     args: &[Expr],
     keywords: &[Keyword],
+    locator: &SourceCodeLocator,
+    fix: bool,
     location: Range,
 ) -> Option<Check> {
     let argument = exactly_one_argument_with_matching_function("dict", func, args, keywords)?;
@@ -208,18 +211,24 @@ pub fn unnecessary_literal_dict(
         ExprKind::List { elts, .. } => ("list", elts),
         _ => return None,
     };
-
-    if let Some(elt) = elts.first() {
-        // dict((1, 2), ...)) or dict([(1, 2), ...])
-        if !matches!(&elt.node, ExprKind::Tuple { elts, .. } if elts.len() == 2) {
-            return None;
-        }
+    // Accept `dict((1, 2), ...))` `dict([(1, 2), ...])`.
+    if !elts
+        .iter()
+        .all(|elt| matches!(&elt.node, ExprKind::Tuple { elts, .. } if elts.len() == 2))
+    {
+        return None;
     }
-
-    Some(Check::new(
+    let mut check = Check::new(
         CheckKind::UnnecessaryLiteralDict(kind.to_string()),
         location,
-    ))
+    );
+    if fix {
+        match fixes::fix_unnecessary_literal_dict(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
+        }
+    }
+    Some(check)
 }
 
 /// C408
@@ -250,12 +259,9 @@ pub fn unnecessary_collection_call(
         location,
     );
     if fix {
-        // TODO(charlie): Support fixing `dict(a=1)`.
-        if keywords.is_empty() {
-            match fixes::fix_unnecessary_collection_call(locator, expr) {
-                Ok(fix) => check.amend(fix),
-                Err(e) => error!("Failed to generate fix: {}", e),
-            }
+        match fixes::fix_unnecessary_collection_call(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
         }
     }
     Some(check)
@@ -446,6 +452,8 @@ pub fn unnecessary_comprehension(
     expr: &Expr,
     elt: &Expr,
     generators: &[Comprehension],
+    locator: &SourceCodeLocator,
+    fix: bool,
     location: Range,
 ) -> Option<Check> {
     if generators.len() != 1 {
@@ -465,10 +473,17 @@ pub fn unnecessary_comprehension(
         ExprKind::SetComp { .. } => "set",
         _ => return None,
     };
-    Some(Check::new(
+    let mut check = Check::new(
         CheckKind::UnnecessaryComprehension(expr_kind.to_string()),
         location,
-    ))
+    );
+    if fix {
+        match fixes::fix_unnecessary_comprehension(locator, expr) {
+            Ok(fix) => check.amend(fix),
+            Err(e) => error!("Failed to generate fix: {}", e),
+        }
+    }
+    Some(check)
 }
 
 /// C417

src/flake8_comprehensions/fixes.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
 use libcst_native::{
-    Arg, Call, Codegen, Dict, DictComp, Element, Expr, Expression, LeftCurlyBrace, LeftParen,
-    LeftSquareBracket, List, ListComp, Module, ParenthesizableWhitespace, RightCurlyBrace,
-    RightParen, RightSquareBracket, Set, SetComp, SimpleWhitespace, SmallStatement, Statement,
-    Tuple,
+    Arg, Call, Codegen, Dict, DictComp, DictElement, Element, Expr, Expression, LeftCurlyBrace,
+    LeftParen, LeftSquareBracket, List, ListComp, Module, Name, ParenthesizableWhitespace,
+    RightCurlyBrace, RightParen, RightSquareBracket, Set, SetComp, SimpleString, SimpleWhitespace,
+    SmallStatement, Statement, Tuple,
 };
 
 use crate::autofix::Fix;
@@ -15,12 +15,10 @@ fn match_expr<'a, 'b>(module: &'a mut Module<'b>) -> Result<&'a mut Expr<'b>> {
         if let Some(SmallStatement::Expr(expr)) = expr.body.first_mut() {
             Ok(expr)
         } else {
-            Err(anyhow::anyhow!(
-                "Expected node to be: SmallStatement::Expr."
-            ))
+            Err(anyhow::anyhow!("Expected node to be: SmallStatement::Expr"))
         }
     } else {
-        Err(anyhow::anyhow!("Expected node to be: Statement::Simple."))
+        Err(anyhow::anyhow!("Expected node to be: Statement::Simple"))
     }
 }
 
@@ -28,7 +26,7 @@ fn match_call<'a, 'b>(expr: &'a mut Expr<'b>) -> Result<&'a mut Call<'b>> {
     if let Expression::Call(call) = &mut expr.value {
         Ok(call)
     } else {
-        Err(anyhow::anyhow!("Expected node to be: Expression::Call."))
+        Err(anyhow::anyhow!("Expected node to be: Expression::Call"))
     }
 }
 
@@ -36,7 +34,7 @@ fn match_arg<'a, 'b>(call: &'a Call<'b>) -> Result<&'a Arg<'b>> {
     if let Some(arg) = call.args.first() {
         Ok(arg)
     } else {
-        Err(anyhow::anyhow!("Expected node to be: Arg."))
+        Err(anyhow::anyhow!("Expected node to be: Arg"))
     }
 }
 
@@ -55,7 +53,7 @@ pub fn fix_unnecessary_generator_list(
         generator_exp
     } else {
         return Err(anyhow::anyhow!(
-            "Expected node to be: Expression::GeneratorExp."
+            "Expected node to be: Expression::GeneratorExp"
         ));
     };
 
@@ -97,7 +95,7 @@ pub fn fix_unnecessary_generator_set(
         generator_exp
     } else {
         return Err(anyhow::anyhow!(
-            "Expected node to be: Expression::GeneratorExp."
+            "Expected node to be: Expression::GeneratorExp"
         ));
     };
 
@@ -140,26 +138,26 @@ pub fn fix_unnecessary_generator_dict(
         generator_exp
     } else {
         return Err(anyhow::anyhow!(
-            "Expected node to be: Expression::GeneratorExp."
+            "Expected node to be: Expression::GeneratorExp"
         ));
     };
     let tuple = if let Expression::Tuple(tuple) = &generator_exp.elt.as_ref() {
         tuple
     } else {
-        return Err(anyhow::anyhow!("Expected node to be: Expression::Tuple."));
+        return Err(anyhow::anyhow!("Expected node to be: Expression::Tuple"));
     };
     let key = if let Some(Element::Simple { value, .. }) = &tuple.elements.get(0) {
         value
     } else {
         return Err(anyhow::anyhow!(
-            "Expected tuple to contain a key as the first element."
+            "Expected tuple to contain a key as the first element"
         ));
     };
     let value = if let Some(Element::Simple { value, .. }) = &tuple.elements.get(1) {
         value
     } else {
         return Err(anyhow::anyhow!(
-            "Expected tuple to contain a key as the second element."
+            "Expected tuple to contain a key as the second element"
         ));
     };
 
@@ -204,9 +202,7 @@ pub fn fix_unnecessary_list_comprehension_set(
     let list_comp = if let Expression::ListComp(list_comp) = &arg.value {
         list_comp
     } else {
-        return Err(anyhow::anyhow!(
-            "Expected node to be: Expression::ListComp."
-        ));
+        return Err(anyhow::anyhow!("Expected node to be: Expression::ListComp"));
     };
 
     body.value = Expression::SetComp(Box::new(SetComp {
@@ -248,7 +244,7 @@ pub fn fix_unnecessary_literal_set(
         Expression::List(inner) => &inner.elements,
         _ => {
             return Err(anyhow::anyhow!(
-                "Expected node to be: Expression::Tuple | Expression::List."
+                "Expected node to be: Expression::Tuple | Expression::List"
             ))
         }
     };
@@ -279,6 +275,77 @@ pub fn fix_unnecessary_literal_set(
     ))
 }
 
+/// (C406) Convert `dict([(1, 2)])` to `{1: 2}`.
+pub fn fix_unnecessary_literal_dict(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    // Expr(Call(List|Tuple)))) -> Expr(Dict)))
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+    let call = match_call(body)?;
+    let arg = match_arg(call)?;
+
+    let elements = match &arg.value {
+        Expression::Tuple(inner) => &inner.elements,
+        Expression::List(inner) => &inner.elements,
+        _ => {
+            return Err(anyhow::anyhow!(
+                "Expected node to be: Expression::Tuple | Expression::List"
+            ))
+        }
+    };
+
+    let elements: Vec<DictElement> = elements
+        .iter()
+        .map(|element| {
+            if let Element::Simple {
+                value: Expression::Tuple(tuple),
+                comma,
+            } = element
+            {
+                if let Some(Element::Simple { value: key, .. }) = tuple.elements.get(0) {
+                    if let Some(Element::Simple { value, .. }) = tuple.elements.get(1) {
+                        return Ok(DictElement::Simple {
+                            key: key.clone(),
+                            value: value.clone(),
+                            comma: comma.clone(),
+                            whitespace_before_colon: Default::default(),
+                            whitespace_after_colon: ParenthesizableWhitespace::SimpleWhitespace(
+                                SimpleWhitespace(" "),
+                            ),
+                        });
+                    }
+                }
+            }
+            Err(anyhow::anyhow!(
+                "Expected each argument to be a tuple of length two"
+            ))
+        })
+        .collect::<Result<Vec<DictElement>>>()?;
+
+    body.value = Expression::Dict(Box::new(Dict {
+        elements,
+        lbrace: LeftCurlyBrace {
+            whitespace_after: call.whitespace_before_args.clone(),
+        },
+        rbrace: RightCurlyBrace {
+            whitespace_before: arg.whitespace_after_arg.clone(),
+        },
+        lpar: Default::default(),
+        rpar: Default::default(),
+    }));
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}
+
 /// (C408)
 pub fn fix_unnecessary_collection_call(
     locator: &SourceCodeLocator,
@@ -291,9 +358,13 @@ pub fn fix_unnecessary_collection_call(
     let name = if let Expression::Name(name) = &call.func.as_ref() {
         name
     } else {
-        return Err(anyhow::anyhow!("Expected node to be: Expression::Name."));
+        return Err(anyhow::anyhow!("Expected node to be: Expression::Name"));
     };
 
+    // Arena allocator used to create formatted strings of sufficient lifetime,
+    // below.
+    let mut arena: Vec<String> = vec![];
+
     match name.value {
         "tuple" => {
             body.value = Expression::Tuple(Box::new(Tuple {
@@ -312,17 +383,67 @@ pub fn fix_unnecessary_collection_call(
             }));
         }
         "dict" => {
-            body.value = Expression::Dict(Box::new(Dict {
-                elements: Default::default(),
-                lbrace: Default::default(),
-                rbrace: Default::default(),
-                lpar: Default::default(),
-                rpar: Default::default(),
-            }));
+            if call.args.is_empty() {
+                body.value = Expression::Dict(Box::new(Dict {
+                    elements: Default::default(),
+                    lbrace: Default::default(),
+                    rbrace: Default::default(),
+                    lpar: Default::default(),
+                    rpar: Default::default(),
+                }));
+            } else {
+                // Quote each argument.
+                for arg in &call.args {
+                    let quoted = format!(
+                        "\"{}\"",
+                        arg.keyword
+                            .as_ref()
+                            .expect("Expected dictionary argument to be kwarg")
+                            .value
+                    );
+                    arena.push(quoted);
+                }
+
+                let elements = call
+                    .args
+                    .iter()
+                    .enumerate()
+                    .map(|(i, arg)| DictElement::Simple {
+                        key: Expression::SimpleString(Box::new(SimpleString {
+                            value: &arena[i],
+                            lpar: Default::default(),
+                            rpar: Default::default(),
+                        })),
+                        value: arg.value.clone(),
+                        comma: arg.comma.clone(),
+                        whitespace_before_colon: Default::default(),
+                        whitespace_after_colon: ParenthesizableWhitespace::SimpleWhitespace(
+                            SimpleWhitespace(" "),
+                        ),
+                    })
+                    .collect();
+
+                body.value = Expression::Dict(Box::new(Dict {
+                    elements,
+                    lbrace: LeftCurlyBrace {
+                        whitespace_after: call.whitespace_before_args.clone(),
+                    },
+                    rbrace: RightCurlyBrace {
+                        whitespace_before: call
+                            .args
+                            .last()
+                            .expect("Arguments should be non-empty")
+                            .whitespace_after_arg
+                            .clone(),
+                    },
+                    lpar: Default::default(),
+                    rpar: Default::default(),
+                }));
+            }
         }
         _ => {
             return Err(anyhow::anyhow!("Expected function name to be one of: \
-                                        'tuple', 'list', 'dict'."
+                                        'tuple', 'list', 'dict'"
                 .to_string()));
         }
     };
@@ -352,12 +473,12 @@ pub fn fix_unnecessary_literal_within_tuple_call(
             &inner
                 .lpar
                 .first()
-                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses"))?
                 .whitespace_after,
             &inner
                 .rpar
                 .first()
-                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses"))?
                 .whitespace_before,
         ),
         Expression::List(inner) => (
@@ -367,7 +488,7 @@ pub fn fix_unnecessary_literal_within_tuple_call(
         ),
         _ => {
             return Err(anyhow::anyhow!(
-                "Expected node to be: Expression::Tuple | Expression::List."
+                "Expected node to be: Expression::Tuple | Expression::List"
             ))
         }
     };
@@ -407,12 +528,12 @@ pub fn fix_unnecessary_literal_within_list_call(
             &inner
                 .lpar
                 .first()
-                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses"))?
                 .whitespace_after,
             &inner
                 .rpar
                 .first()
-                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses."))?
+                .ok_or_else(|| anyhow::anyhow!("Expected at least one set of parentheses"))?
                 .whitespace_before,
         ),
         Expression::List(inner) => (
@@ -422,7 +543,7 @@ pub fn fix_unnecessary_literal_within_list_call(
         ),
         _ => {
             return Err(anyhow::anyhow!(
-                "Expected node to be: Expression::Tuple | Expression::List."
+                "Expected node to be: Expression::Tuple | Expression::List"
             ))
         }
     };
@@ -449,7 +570,7 @@ pub fn fix_unnecessary_literal_within_list_call(
     ))
 }
 
-/// (C411) Convert `list([i for i in x])` to `[i for i in x]`.
+/// (C411) Convert `list([i * i for i in x])` to `[i * i for i in x]`.
 pub fn fix_unnecessary_list_call(
     locator: &SourceCodeLocator,
     expr: &rustpython_ast::Expr,
@@ -471,3 +592,73 @@ pub fn fix_unnecessary_list_call(
         expr.end_location.unwrap(),
     ))
 }
+
+/// (C416) Convert `[i for i in x]` to `list(x)`.
+pub fn fix_unnecessary_comprehension(
+    locator: &SourceCodeLocator,
+    expr: &rustpython_ast::Expr,
+) -> Result<Fix> {
+    let mut tree = match_tree(locator, expr)?;
+    let mut body = match_expr(&mut tree)?;
+
+    match &body.value {
+        Expression::ListComp(inner) => {
+            body.value = Expression::Call(Box::new(Call {
+                func: Box::new(Expression::Name(Box::new(Name {
+                    value: "list",
+                    lpar: Default::default(),
+                    rpar: Default::default(),
+                }))),
+                args: vec![Arg {
+                    value: inner.for_in.iter.clone(),
+                    keyword: Default::default(),
+                    equal: Default::default(),
+                    comma: Default::default(),
+                    star: Default::default(),
+                    whitespace_after_star: Default::default(),
+                    whitespace_after_arg: Default::default(),
+                }],
+                lpar: Default::default(),
+                rpar: Default::default(),
+                whitespace_after_func: Default::default(),
+                whitespace_before_args: Default::default(),
+            }))
+        }
+        Expression::SetComp(inner) => {
+            body.value = Expression::Call(Box::new(Call {
+                func: Box::new(Expression::Name(Box::new(Name {
+                    value: "set",
+                    lpar: Default::default(),
+                    rpar: Default::default(),
+                }))),
+                args: vec![Arg {
+                    value: inner.for_in.iter.clone(),
+                    keyword: Default::default(),
+                    equal: Default::default(),
+                    comma: Default::default(),
+                    star: Default::default(),
+                    whitespace_after_star: Default::default(),
+                    whitespace_after_arg: Default::default(),
+                }],
+                lpar: Default::default(),
+                rpar: Default::default(),
+                whitespace_after_func: Default::default(),
+                whitespace_before_args: Default::default(),
+            }))
+        }
+        _ => {
+            return Err(anyhow::anyhow!(
+                "Expected node to be: Expression::ListComp | Expression:SetComp"
+            ))
+        }
+    }
+
+    let mut state = Default::default();
+    tree.codegen(&mut state);
+
+    Ok(Fix::replacement(
+        state.to_string(),
+        expr.location,
+        expr.end_location.unwrap(),
+    ))
+}

src/pyflakes/fixes.rs

@@ -20,13 +20,13 @@ pub fn remove_unused_imports(
     let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
         body
     } else {
-        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
+        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple"));
     };
     let body = if let Some(SmallStatement::Import(body)) = body.body.first_mut() {
         body
     } else {
         return Err(anyhow::anyhow!(
-            "Expected node to be: SmallStatement::ImportFrom."
+            "Expected node to be: SmallStatement::ImportFrom"
         ));
     };
     let aliases = &mut body.names;
@@ -77,20 +77,20 @@ pub fn remove_unused_import_froms(
     let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
         body
     } else {
-        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
+        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple"));
     };
     let body = if let Some(SmallStatement::ImportFrom(body)) = body.body.first_mut() {
         body
     } else {
         return Err(anyhow::anyhow!(
-            "Expected node to be: SmallStatement::ImportFrom."
+            "Expected node to be: SmallStatement::ImportFrom"
         ));
     };
 
     let aliases = if let ImportNames::Aliases(aliases) = &mut body.names {
         aliases
     } else {
-        return Err(anyhow::anyhow!("Expected node to be: Aliases."));
+        return Err(anyhow::anyhow!("Expected node to be: Aliases"));
     };
 
     // Preserve the trailing comma (or not) from the last entry.

src/snapshots/ruff__linter__tests__C406_C406.py.snap

@@ -10,7 +10,16 @@ expression: checks
   end_location:
     row: 1
     column: 19
-  fix: ~
+  fix:
+    patch:
+      content: "{1: 2}"
+      location:
+        row: 1
+        column: 5
+      end_location:
+        row: 1
+        column: 19
+    applied: false
 - kind:
     UnnecessaryLiteralDict: tuple
   location:
@@ -19,7 +28,16 @@ expression: checks
   end_location:
     row: 2
     column: 20
-  fix: ~
+  fix:
+    patch:
+      content: "{1: 2,}"
+      location:
+        row: 2
+        column: 5
+      end_location:
+        row: 2
+        column: 20
+    applied: false
 - kind:
     UnnecessaryLiteralDict: list
   location:
@@ -28,7 +46,16 @@ expression: checks
   end_location:
     row: 3
     column: 13
-  fix: ~
+  fix:
+    patch:
+      content: "{}"
+      location:
+        row: 3
+        column: 5
+      end_location:
+        row: 3
+        column: 13
+    applied: false
 - kind:
     UnnecessaryLiteralDict: tuple
   location:
@@ -37,5 +64,14 @@ expression: checks
   end_location:
     row: 4
     column: 13
-  fix: ~
+  fix:
+    patch:
+      content: "{}"
+      location:
+        row: 4
+        column: 5
+      end_location:
+        row: 4
+        column: 13
+    applied: false
 

src/snapshots/ruff__linter__tests__C408_C408.py.snap

@@ -64,5 +64,14 @@ expression: checks
   end_location:
     row: 4
     column: 14
-  fix: ~
+  fix:
+    patch:
+      content: "{\"a\": 1}"
+      location:
+        row: 4
+        column: 5
+      end_location:
+        row: 4
+        column: 14
+    applied: false
 

src/snapshots/ruff__linter__tests__C416_C416.py.snap

@@ -10,7 +10,16 @@ expression: checks
   end_location:
     row: 2
     column: 14
-  fix: ~
+  fix:
+    patch:
+      content: list(x)
+      location:
+        row: 2
+        column: 0
+      end_location:
+        row: 2
+        column: 14
+    applied: false
 - kind:
     UnnecessaryComprehension: set
   location:
@@ -19,5 +28,14 @@ expression: checks
   end_location:
     row: 3
     column: 14
-  fix: ~
+  fix:
+    patch:
+      content: set(x)
+      location:
+        row: 3
+        column: 0
+      end_location:
+        row: 3
+        column: 14
+    applied: false