Ruff 2025 style guide (#13906)

Closes #13371

crates/ruff_python_formatter/generate.py

@@ -37,7 +37,6 @@ for node_line in node_lines:
     # `FStringLiteralElement`, `FStringFormatSpec` and `FStringExpressionElement` are handled by the `FString`
     # implementation.
     if node in (
-        "FString",
         "FStringLiteralElement",
         "FStringExpressionElement",
         "FStringFormatSpec",

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/join_implicit_concatenated_string.options.json

@@ -1,5 +0,0 @@
-[
-  {
-    "preview": "enabled"
-  }
-]

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/join_implicit_concatenated_string_assignment.options.json

@@ -1,5 +0,0 @@
-[
-  {
-    "preview": "enabled"
-  }
-]

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/join_implicit_concatenated_string_preserve.options.json

@@ -1,11 +1,9 @@
 [
   {
-    "quote_style": "preserve",
+    "quote_style": "preserve"
-    "preview": "enabled"
   },
   {
     "quote_style": "preserve",
-    "preview": "enabled",
     "target_version": "py312"
   }
 ]

crates/ruff_python_formatter/resources/test/fixtures/ruff/range_formatting/stub.options.json

@@ -1,6 +1,5 @@
 [
   {
-    "preview": "enabled",
     "source_type": "Stub"
   }
 ]

crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/assignment_split_value_first.options.json

@@ -1,5 +0,0 @@
-[
-  {
-    "preview": "enabled"
-  }
-]

crates/ruff_python_formatter/src/expression/expr_f_string.rs

@@ -1,15 +1,14 @@
 use ruff_python_ast::{AnyNodeRef, ExprFString, StringLike};
-use ruff_text_size::TextSlice;
 
 use crate::expression::parentheses::{
     in_parentheses_only_group, NeedsParentheses, OptionalParentheses,
 };
-use crate::other::f_string::{FStringLayout, FormatFString};
+use crate::other::f_string::FStringLayout;
 use crate::prelude::*;
 use crate::string::implicit::{
     FormatImplicitConcatenatedString, FormatImplicitConcatenatedStringFlat,
 };
-use crate::string::{Quoting, StringLikeExtensions};
+use crate::string::StringLikeExtensions;
 
 #[derive(Default)]
 pub struct FormatExprFString;
@@ -23,7 +22,7 @@ impl FormatNodeRule<ExprFString> for FormatExprFString {
             // [`ruff_python_ast::FStringValue::single`] constructor.
             let f_string = f_string_part.as_f_string().unwrap();
 
-            FormatFString::new(f_string, f_string_quoting(item, f.context().source())).fmt(f)
+            f_string.format().fmt(f)
         } else {
             // Always join fstrings that aren't parenthesized and thus, are always on a single line.
             if !f.context().node_level().is_parenthesized() {
@@ -58,28 +57,3 @@ impl NeedsParentheses for ExprFString {
         }
     }
 }
-
-pub(crate) fn f_string_quoting(f_string: &ExprFString, source: &str) -> Quoting {
-    let unprefixed = source
-        .slice(f_string)
-        .trim_start_matches(|c| c != '"' && c != '\'');
-    let triple_quoted = unprefixed.starts_with(r#"""""#) || unprefixed.starts_with(r"'''");
-
-    if f_string
-        .value
-        .elements()
-        .filter_map(|element| element.as_expression())
-        .any(|expression| {
-            let string_content = source.slice(expression);
-            if triple_quoted {
-                string_content.contains(r#"""""#) || string_content.contains("'''")
-            } else {
-                string_content.contains(['"', '\''])
-            }
-        })
-    {
-        Quoting::Preserve
-    } else {
-        Quoting::CanChange
-    }
-}

crates/ruff_python_formatter/src/expression/expr_subscript.rs

@@ -8,7 +8,6 @@ use crate::expression::parentheses::{
 };
 use crate::expression::CallChainLayout;
 use crate::prelude::*;
-use crate::preview::is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled;
 
 #[derive(Default)]
 pub struct FormatExprSubscript {
@@ -108,13 +107,14 @@ impl NeedsParentheses for ExprSubscript {
                             if function.returns.as_deref().is_some_and(|returns| {
                                 AnyNodeRef::ptr_eq(returns.into(), self.into())
                             }) {
-                                if is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(context) &&
+                                if function.parameters.is_empty()
-                                    function.parameters.is_empty() && !context.comments().has(&*function.parameters) {
+                                    && !context.comments().has(&*function.parameters)
+                                {
                                     // Apply the `optional_parentheses` layout when the subscript
                                     // is in a return type position of a function without parameters.
                                     // This ensures the subscript is parenthesized if it has a very
                                     // long name that goes over the line length limit.
-                                    return OptionalParentheses::Multiline
+                                    return OptionalParentheses::Multiline;
                                 }
 
                                 // Don't use the best fitting layout for return type annotation because it results in the

crates/ruff_python_formatter/src/expression/mod.rs

@@ -19,10 +19,7 @@ use crate::expression::parentheses::{
     OptionalParentheses, Parentheses, Parenthesize,
 };
 use crate::prelude::*;
-use crate::preview::{
+use crate::preview::is_hug_parens_with_braces_and_square_brackets_enabled;
-    is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled,
-    is_f_string_formatting_enabled, is_hug_parens_with_braces_and_square_brackets_enabled,
-};
 
 mod binary_like;
 pub(crate) mod expr_attribute;
@@ -388,18 +385,12 @@ impl Format<PyFormatContext<'_>> for MaybeParenthesizeExpression<'_> {
             // is parenthesized. Unless, it's the `Parenthesize::IfBreaksParenthesizedNested` layout
             // where parenthesizing nested `maybe_parenthesized_expression` is explicitly desired.
             _ if f.context().node_level().is_parenthesized() => {
-                if !is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(
+                return if matches!(parenthesize, Parenthesize::IfBreaksParenthesizedNested) {
-                    f.context(),
+                    parenthesize_if_expands(&expression.format().with_options(Parentheses::Never))
-                ) {
-                    OptionalParentheses::Never
-                } else if matches!(parenthesize, Parenthesize::IfBreaksParenthesizedNested) {
-                    return parenthesize_if_expands(
-                        &expression.format().with_options(Parentheses::Never),
-                    )
                         .with_indent(!is_expression_huggable(expression, f.context()))
-                    .fmt(f);
+                        .fmt(f)
                 } else {
-                    return expression.format().with_options(Parentheses::Never).fmt(f);
+                    expression.format().with_options(Parentheses::Never).fmt(f)
                 }
             }
             needs_parentheses => needs_parentheses,
@@ -409,13 +400,12 @@ impl Format<PyFormatContext<'_>> for MaybeParenthesizeExpression<'_> {
 
         match needs_parentheses {
             OptionalParentheses::Multiline => match parenthesize {
-                Parenthesize::IfBreaksParenthesized | Parenthesize::IfBreaksParenthesizedNested if !is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(f.context()) => {
-                    parenthesize_if_expands(&unparenthesized).fmt(f)
-                }
-
                 Parenthesize::IfRequired => unparenthesized.fmt(f),
 
-                Parenthesize::Optional | Parenthesize::IfBreaks | Parenthesize::IfBreaksParenthesized | Parenthesize::IfBreaksParenthesizedNested => {
+                Parenthesize::Optional
+                | Parenthesize::IfBreaks
+                | Parenthesize::IfBreaksParenthesized
+                | Parenthesize::IfBreaksParenthesizedNested => {
                     if can_omit_optional_parentheses(expression, f.context()) {
                         optional_parentheses(&unparenthesized).fmt(f)
                     } else {
@@ -424,9 +414,6 @@ impl Format<PyFormatContext<'_>> for MaybeParenthesizeExpression<'_> {
                 }
             },
             OptionalParentheses::BestFit => match parenthesize {
-                Parenthesize::IfBreaksParenthesized | Parenthesize::IfBreaksParenthesizedNested if !is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(f.context()) =>
-                    parenthesize_if_expands(&unparenthesized).fmt(f),
-
                 Parenthesize::IfBreaksParenthesized | Parenthesize::IfBreaksParenthesizedNested => {
                     // Can-omit layout is relevant for `"abcd".call`. We don't want to add unnecessary
                     // parentheses in this case.
@@ -454,15 +441,11 @@ impl Format<PyFormatContext<'_>> for MaybeParenthesizeExpression<'_> {
                 }
             },
             OptionalParentheses::Never => match parenthesize {
-                Parenthesize::IfBreaksParenthesized |  Parenthesize::IfBreaksParenthesizedNested if !is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(f.context()) => {
+                Parenthesize::Optional
-                    parenthesize_if_expands(&unparenthesized)
+                | Parenthesize::IfBreaks
-                        .with_indent(!is_expression_huggable(expression, f.context()))
+                | Parenthesize::IfRequired
-                        .fmt(f)
+                | Parenthesize::IfBreaksParenthesized
-                }
+                | Parenthesize::IfBreaksParenthesizedNested => unparenthesized.fmt(f),
-
-                Parenthesize::Optional | Parenthesize::IfBreaks | Parenthesize::IfRequired | Parenthesize::IfBreaksParenthesized |  Parenthesize::IfBreaksParenthesizedNested => {
-                    unparenthesized.fmt(f)
-                }
             },
 
             OptionalParentheses::Always => {
@@ -766,32 +749,6 @@ impl<'input> CanOmitOptionalParenthesesVisitor<'input> {
                 return;
             }
 
-            Expr::StringLiteral(ast::ExprStringLiteral { value, .. })
-                if value.is_implicit_concatenated() =>
-            {
-                if !is_f_string_formatting_enabled(self.context) {
-                    self.update_max_precedence(OperatorPrecedence::String);
-                }
-
-                return;
-            }
-            Expr::BytesLiteral(ast::ExprBytesLiteral { value, .. })
-                if value.is_implicit_concatenated() =>
-            {
-                if !is_f_string_formatting_enabled(self.context) {
-                    self.update_max_precedence(OperatorPrecedence::String);
-                }
-
-                return;
-            }
-            Expr::FString(ast::ExprFString { value, .. }) if value.is_implicit_concatenated() => {
-                if !is_f_string_formatting_enabled(self.context) {
-                    self.update_max_precedence(OperatorPrecedence::String);
-                }
-
-                return;
-            }
-
             // Non terminal nodes that don't have a termination token.
             Expr::Named(_) | Expr::Generator(_) | Expr::Tuple(_) => {}
 
@@ -1193,8 +1150,6 @@ enum OperatorPrecedence {
     BitwiseXor,
     BitwiseOr,
     Comparator,
-    // Implicit string concatenation
-    String,
     BooleanOperation,
     Conditional,
 }

crates/ruff_python_formatter/src/generated.rs

@@ -2935,6 +2935,34 @@ impl<'ast> IntoFormat<PyFormatContext<'ast>> for ast::TypeParamParamSpec {
     }
 }
 
+impl FormatRule<ast::FString, PyFormatContext<'_>> for crate::other::f_string::FormatFString {
+    #[inline]
+    fn fmt(&self, node: &ast::FString, f: &mut PyFormatter) -> FormatResult<()> {
+        FormatNodeRule::<ast::FString>::fmt(self, node, f)
+    }
+}
+impl<'ast> AsFormat<PyFormatContext<'ast>> for ast::FString {
+    type Format<'a> = FormatRefWithRule<
+        'a,
+        ast::FString,
+        crate::other::f_string::FormatFString,
+        PyFormatContext<'ast>,
+    >;
+    fn format(&self) -> Self::Format<'_> {
+        FormatRefWithRule::new(self, crate::other::f_string::FormatFString::default())
+    }
+}
+impl<'ast> IntoFormat<PyFormatContext<'ast>> for ast::FString {
+    type Format = FormatOwnedWithRule<
+        ast::FString,
+        crate::other::f_string::FormatFString,
+        PyFormatContext<'ast>,
+    >;
+    fn into_format(self) -> Self::Format {
+        FormatOwnedWithRule::new(self, crate::other::f_string::FormatFString::default())
+    }
+}
+
 impl FormatRule<ast::StringLiteral, PyFormatContext<'_>>
     for crate::other::string_literal::FormatStringLiteral
 {

crates/ruff_python_formatter/src/other/comprehension.rs

@@ -7,7 +7,6 @@ use crate::comments::{leading_comments, trailing_comments};
 use crate::expression::expr_tuple::TupleParentheses;
 use crate::expression::parentheses::is_expression_parenthesized;
 use crate::prelude::*;
-use crate::preview::is_comprehension_leading_expression_comments_same_line_enabled;
 
 #[derive(Default)]
 pub struct FormatComprehension;
@@ -36,9 +35,7 @@ impl FormatNodeRule<Comprehension> for FormatComprehension {
                 //     )
                 // ]
                 // ```
-                let will_be_parenthesized =
+                let will_be_parenthesized = self.preserve_parentheses
-                    is_comprehension_leading_expression_comments_same_line_enabled(f.context())
-                        && self.preserve_parentheses
                     && is_expression_parenthesized(
                         self.expression.into(),
                         f.context().comments().ranges(),

crates/ruff_python_formatter/src/other/f_string.rs

@@ -4,8 +4,7 @@ use ruff_source_file::LineRanges;
 use ruff_text_size::Ranged;
 
 use crate::prelude::*;
-use crate::preview::is_f_string_formatting_enabled;
+use crate::string::{StringNormalizer, StringQuotes};
-use crate::string::{Quoting, StringNormalizer, StringQuotes};
 
 use super::f_string_element::FormatFStringElement;
 
@@ -13,66 +12,25 @@ use super::f_string_element::FormatFStringElement;
 ///
 /// For example, this would be used to format the f-string part in `"foo" f"bar {x}"`
 /// or the standalone f-string in `f"foo {x} bar"`.
-pub(crate) struct FormatFString<'a> {
+#[derive(Default)]
-    value: &'a FString,
+pub struct FormatFString;
-    /// The quoting of an f-string. This is determined by the parent node
-    /// (f-string expression) and is required to format an f-string correctly.
-    quoting: Quoting,
-}
 
-impl<'a> FormatFString<'a> {
+impl FormatNodeRule<FString> for FormatFString {
-    pub(crate) fn new(value: &'a FString, quoting: Quoting) -> Self {
+    fn fmt_fields(&self, item: &FString, f: &mut PyFormatter) -> FormatResult<()> {
-        Self { value, quoting }
+        let normalizer = StringNormalizer::from_context(f.context());
-    }
-}
 
-impl Format<PyFormatContext<'_>> for FormatFString<'_> {
+        let string_kind = normalizer.choose_quotes(item.into()).flags();
-    fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
-        // If the preview style is enabled, make the decision on what quotes to use locally for each
-        // f-string instead of globally for the entire f-string expression.
-        let quoting = if is_f_string_formatting_enabled(f.context()) {
-            Quoting::CanChange
-        } else {
-            self.quoting
-        };
-
-        let normalizer = StringNormalizer::from_context(f.context()).with_quoting(quoting);
-
-        // If f-string formatting is disabled (not in preview), then we will
-        // fall back to the previous behavior of normalizing the f-string.
-        if !is_f_string_formatting_enabled(f.context()) {
-            let result = normalizer.normalize(self.value.into()).fmt(f);
-            let comments = f.context().comments();
-            self.value.elements.iter().for_each(|value| {
-                comments.mark_verbatim_node_comments_formatted(value.into());
-                // Above method doesn't mark the trailing comments of the f-string elements
-                // as formatted, so we need to do it manually. For example,
-                //
-                // ```python
-                // f"""foo {
-                //     x:.3f
-                //     # comment
-                // }"""
-                // ```
-                for trailing_comment in comments.trailing(value) {
-                    trailing_comment.mark_formatted();
-                }
-            });
-            return result;
-        }
-
-        let string_kind = normalizer.choose_quotes(self.value.into()).flags();
 
         let context = FStringContext::new(
             string_kind,
-            FStringLayout::from_f_string(self.value, f.context().source()),
+            FStringLayout::from_f_string(item, f.context().source()),
         );
 
         // Starting prefix and quote
         let quotes = StringQuotes::from(string_kind);
         write!(f, [string_kind.prefix(), quotes])?;
 
-        for element in &self.value.elements {
+        for element in &item.elements {
             FormatFStringElement::new(element, context).fmt(f)?;
         }
 

crates/ruff_python_formatter/src/other/f_string_element.rs

@@ -61,8 +61,7 @@ impl<'a> FormatFStringLiteralElement<'a> {
 impl Format<PyFormatContext<'_>> for FormatFStringLiteralElement<'_> {
     fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
         let literal_content = f.context().source().slice(self.element);
-        let normalized =
+        let normalized = normalize_string(literal_content, 0, self.fstring_flags, false);
-            normalize_string(literal_content, 0, self.fstring_flags, false, false, true);
         match &normalized {
             Cow::Borrowed(_) => source_text_slice(self.element.range()).fmt(f),
             Cow::Owned(normalized) => text(normalized).fmt(f),

crates/ruff_python_formatter/src/other/match_case.rs

@@ -1,15 +1,10 @@
-use ruff_formatter::{write, FormatRuleWithOptions};
+use ruff_formatter::{format_args, write, FormatRuleWithOptions};
-use ruff_python_ast::AstNode;
 use ruff_python_ast::MatchCase;
 
-use crate::builders::parenthesize_if_expands;
 use crate::expression::maybe_parenthesize_expression;
-use crate::expression::parentheses::{
+use crate::expression::parentheses::Parenthesize;
-    NeedsParentheses, OptionalParentheses, Parentheses, Parenthesize,
-};
 use crate::pattern::maybe_parenthesize_pattern;
 use crate::prelude::*;
-use crate::preview::is_match_case_parentheses_enabled;
 use crate::statement::clause::{clause_body, clause_header, ClauseHeader};
 use crate::statement::suite::SuiteKind;
 
@@ -39,42 +34,12 @@ impl FormatNodeRule<MatchCase> for FormatMatchCase {
         let comments = f.context().comments().clone();
         let dangling_item_comments = comments.dangling(item);
 
-        let format_pattern = format_with(|f| {
-            if is_match_case_parentheses_enabled(f.context()) {
-                maybe_parenthesize_pattern(pattern, item).fmt(f)
-            } else {
-                let has_comments =
-                    comments.has_leading(pattern) || comments.has_trailing_own_line(pattern);
-
-                if has_comments {
-                    pattern.format().with_options(Parentheses::Always).fmt(f)
-                } else {
-                    match pattern.needs_parentheses(item.as_any_node_ref(), f.context()) {
-                        OptionalParentheses::Multiline => parenthesize_if_expands(
-                            &pattern.format().with_options(Parentheses::Never),
-                        )
-                        .fmt(f),
-                        OptionalParentheses::Always => {
-                            pattern.format().with_options(Parentheses::Always).fmt(f)
-                        }
-                        OptionalParentheses::Never | OptionalParentheses::BestFit => {
-                            pattern.format().with_options(Parentheses::Never).fmt(f)
-                        }
-                    }
-                }
-            }
-        });
-
         let format_guard = guard.as_deref().map(|guard| {
             format_with(|f| {
                 write!(f, [space(), token("if"), space()])?;
 
-                if is_match_case_parentheses_enabled(f.context()) {
                 maybe_parenthesize_expression(guard, item, Parenthesize::IfBreaksParenthesized)
                     .fmt(f)
-                } else {
-                    guard.format().fmt(f)
-                }
             })
         });
 
@@ -84,9 +49,12 @@ impl FormatNodeRule<MatchCase> for FormatMatchCase {
                 clause_header(
                     ClauseHeader::MatchCase(item),
                     dangling_item_comments,
-                    &format_with(|f| {
+                    &format_args![
-                        write!(f, [token("case"), space(), format_pattern, format_guard])
+                        token("case"),
-                    }),
+                        space(),
+                        maybe_parenthesize_pattern(pattern, item),
+                        format_guard
+                    ],
                 ),
                 clause_body(
                     body,

crates/ruff_python_formatter/src/other/string_literal.rs

@@ -2,8 +2,7 @@ use ruff_formatter::FormatRuleWithOptions;
 use ruff_python_ast::StringLiteral;
 
 use crate::prelude::*;
-use crate::preview::is_f_string_implicit_concatenated_string_literal_quotes_enabled;
+use crate::string::{docstring, StringNormalizer};
-use crate::string::{docstring, Quoting, StringNormalizer};
 use crate::QuoteStyle;
 
 #[derive(Default)]
@@ -28,12 +27,6 @@ pub enum StringLiteralKind {
     String,
     /// A string literal used as a docstring.
     Docstring,
-    /// A string literal that is implicitly concatenated with an f-string. This
-    /// makes the overall expression an f-string whose quoting detection comes
-    /// from the parent node (f-string expression).
-    #[deprecated]
-    #[allow(private_interfaces)]
-    InImplicitlyConcatenatedFString(Quoting),
 }
 
 impl StringLiteralKind {
@@ -41,26 +34,6 @@ impl StringLiteralKind {
     pub(crate) const fn is_docstring(self) -> bool {
         matches!(self, StringLiteralKind::Docstring)
     }
-
-    /// Returns the quoting to be used for this string literal.
-    fn quoting(self, context: &PyFormatContext) -> Quoting {
-        match self {
-            StringLiteralKind::String | StringLiteralKind::Docstring => Quoting::CanChange,
-            #[allow(deprecated)]
-            StringLiteralKind::InImplicitlyConcatenatedFString(quoting) => {
-                // Allow string literals to pick the "optimal" quote character
-                // even if any other fstring in the implicit concatenation uses an expression
-                // containing a quote character.
-                // TODO: Remove StringLiteralKind::InImplicitlyConcatenatedFString when promoting
-                //   this style to stable and remove the layout from `AnyStringPart::String`.
-                if is_f_string_implicit_concatenated_string_literal_quotes_enabled(context) {
-                    Quoting::CanChange
-                } else {
-                    quoting
-                }
-            }
-        }
-    }
 }
 
 impl FormatNodeRule<StringLiteral> for FormatStringLiteral {
@@ -75,7 +48,6 @@ impl FormatNodeRule<StringLiteral> for FormatStringLiteral {
         };
 
         let normalized = StringNormalizer::from_context(f.context())
-            .with_quoting(self.layout.quoting(f.context()))
             .with_preferred_quote_style(quote_style)
             .normalize(item.into());
 

crates/ruff_python_formatter/src/other/with_item.rs

@@ -6,9 +6,7 @@ use crate::expression::parentheses::{
     is_expression_parenthesized, parenthesized, Parentheses, Parenthesize,
 };
 use crate::prelude::*;
-use crate::preview::{
+use crate::preview::is_with_single_target_parentheses_enabled;
-    is_with_single_item_pre_39_enabled, is_with_single_target_parentheses_enabled,
-};
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum WithItemLayout {
@@ -154,9 +152,7 @@ impl FormatNodeRule<WithItem> for FormatWithItem {
             }
 
             WithItemLayout::Python38OrOlder { single } => {
-                let parenthesize = if (single && is_with_single_item_pre_39_enabled(f.context()))
+                let parenthesize = if single || is_parenthesized {
-                    || is_parenthesized
-                {
                     Parenthesize::IfBreaks
                 } else {
                     Parenthesize::IfRequired

crates/ruff_python_formatter/src/pattern/mod.rs

@@ -14,7 +14,6 @@ use crate::expression::parentheses::{
     optional_parentheses, parenthesized, NeedsParentheses, OptionalParentheses, Parentheses,
 };
 use crate::prelude::*;
-use crate::preview::is_join_implicit_concatenated_string_enabled;
 
 pub(crate) mod pattern_arguments;
 pub(crate) mod pattern_keyword;
@@ -227,7 +226,7 @@ pub(crate) fn can_pattern_omit_optional_parentheses(
     pattern: &Pattern,
     context: &PyFormatContext,
 ) -> bool {
-    let mut visitor = CanOmitOptionalParenthesesVisitor::new(context);
+    let mut visitor = CanOmitOptionalParenthesesVisitor::default();
     visitor.visit_pattern(pattern, context);
 
     if !visitor.any_parenthesized_expressions {
@@ -272,32 +271,16 @@ pub(crate) fn can_pattern_omit_optional_parentheses(
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Default)]
 struct CanOmitOptionalParenthesesVisitor<'input> {
     max_precedence: OperatorPrecedence,
     max_precedence_count: usize,
     any_parenthesized_expressions: bool,
-    join_implicit_concatenated_strings: bool,
     last: Option<&'input Pattern>,
     first: First<'input>,
 }
 
 impl<'a> CanOmitOptionalParenthesesVisitor<'a> {
-    fn new(context: &PyFormatContext) -> Self {
-        Self {
-            max_precedence: OperatorPrecedence::default(),
-            max_precedence_count: 0,
-            any_parenthesized_expressions: false,
-            // TODO: Derive default for `CanOmitOptionalParenthesesVisitor` when removing the `join_implicit_concatenated_strings`
-            //   preview style.
-            join_implicit_concatenated_strings: is_join_implicit_concatenated_string_enabled(
-                context,
-            ),
-            last: None,
-            first: First::default(),
-        }
-    }
-
     fn visit_pattern(&mut self, pattern: &'a Pattern, context: &PyFormatContext) {
         match pattern {
             Pattern::MatchSequence(_) | Pattern::MatchMapping(_) => {
@@ -305,27 +288,11 @@ impl<'a> CanOmitOptionalParenthesesVisitor<'a> {
             }
 
             Pattern::MatchValue(value) => match &*value.value {
-                Expr::StringLiteral(string) => {
+                Expr::StringLiteral(_)  |
-                    if !self.join_implicit_concatenated_strings {
+                Expr::BytesLiteral(_) |
-                        self.update_max_precedence(OperatorPrecedence::String, string.value.len());
-                    }
-                }
-                Expr::BytesLiteral(bytes) => {
-                    if !self.join_implicit_concatenated_strings {
-                        self.update_max_precedence(OperatorPrecedence::String, bytes.value.len());
-                    }
-                }
                 // F-strings are allowed according to python's grammar but fail with a syntax error at runtime.
                 // That's why we need to support them for formatting.
-                Expr::FString(string) => {
+                Expr::FString(_)  |
-                    if !self.join_implicit_concatenated_strings {
-                        self.update_max_precedence(
-                            OperatorPrecedence::String,
-                            string.value.as_slice().len(),
-                        );
-                    }
-                }
-
                 Expr::NumberLiteral(_) | Expr::Attribute(_) | Expr::UnaryOp(_) => {
                     // require no state update other than visit_pattern does.
                 }
@@ -397,8 +364,6 @@ enum OperatorPrecedence {
     None,
     Additive,
     Or,
-    // Implicit string concatenation
-    String,
 }
 
 #[derive(Copy, Clone, Debug, Default)]

crates/ruff_python_formatter/src/pattern/pattern_match_as.rs

@@ -5,7 +5,6 @@ use ruff_python_ast::PatternMatchAs;
 use crate::comments::dangling_comments;
 use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
 use crate::prelude::*;
-use crate::preview::is_match_case_parentheses_enabled;
 
 #[derive(Default)]
 pub struct FormatPatternMatchAs;
@@ -55,16 +54,12 @@ impl NeedsParentheses for PatternMatchAs {
     fn needs_parentheses(
         &self,
         _parent: AnyNodeRef,
-        context: &PyFormatContext,
+        _context: &PyFormatContext,
     ) -> OptionalParentheses {
-        if is_match_case_parentheses_enabled(context) {
         if self.name.is_some() {
             OptionalParentheses::Multiline
         } else {
             OptionalParentheses::BestFit
         }
-        } else {
-            OptionalParentheses::Multiline
-        }
     }
 }

crates/ruff_python_formatter/src/pattern/pattern_match_or.rs

@@ -8,7 +8,6 @@ use crate::expression::parentheses::{
     OptionalParentheses,
 };
 use crate::prelude::*;
-use crate::preview::is_match_case_parentheses_enabled;
 
 #[derive(Default)]
 pub struct FormatPatternMatchOr;
@@ -43,11 +42,7 @@ impl FormatNodeRule<PatternMatchOr> for FormatPatternMatchOr {
             Ok(())
         });
 
-        if is_match_case_parentheses_enabled(f.context()) {
         in_parentheses_only_group(&inner).fmt(f)
-        } else {
-            inner.fmt(f)
-        }
     }
 }
 

crates/ruff_python_formatter/src/pattern/pattern_match_singleton.rs

@@ -3,7 +3,6 @@ use ruff_python_ast::{PatternMatchSingleton, Singleton};
 
 use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
 use crate::prelude::*;
-use crate::preview::is_match_case_parentheses_enabled;
 
 #[derive(Default)]
 pub struct FormatPatternMatchSingleton;
@@ -22,12 +21,8 @@ impl NeedsParentheses for PatternMatchSingleton {
     fn needs_parentheses(
         &self,
         _parent: AnyNodeRef,
-        context: &PyFormatContext,
+        _context: &PyFormatContext,
     ) -> OptionalParentheses {
-        if is_match_case_parentheses_enabled(context) {
         OptionalParentheses::BestFit
-        } else {
-            OptionalParentheses::Never
-        }
     }
 }

crates/ruff_python_formatter/src/pattern/pattern_match_value.rs

@@ -3,7 +3,6 @@ use ruff_python_ast::PatternMatchValue;
 
 use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses, Parentheses};
 use crate::prelude::*;
-use crate::preview::is_match_case_parentheses_enabled;
 
 #[derive(Default)]
 pub struct FormatPatternMatchValue;
@@ -21,10 +20,6 @@ impl NeedsParentheses for PatternMatchValue {
         parent: AnyNodeRef,
         context: &PyFormatContext,
     ) -> OptionalParentheses {
-        if is_match_case_parentheses_enabled(context) {
         self.value.needs_parentheses(parent, context)
-        } else {
-            OptionalParentheses::Never
-        }
     }
 }

crates/ruff_python_formatter/src/preview.rs

@@ -14,65 +14,6 @@ pub(crate) const fn is_hug_parens_with_braces_and_square_brackets_enabled(
     context.is_preview()
 }
 
-/// Returns `true` if the [`f-string formatting`](https://github.com/astral-sh/ruff/issues/7594) preview style is enabled.
-/// WARNING: This preview style depends on `is_f_string_implicit_concatenated_string_literal_quotes_enabled`.
-/// TODO: Remove `Quoting` when promoting this preview style and convert `FormatStringPart` etc. regular `FormatWithRule` implementations.
-/// TODO: Remove `format_f_string` from `normalize_string` when promoting this preview style.
-pub(crate) fn is_f_string_formatting_enabled(context: &PyFormatContext) -> bool {
-    context.is_preview()
-}
-
-/// See [#13539](https://github.com/astral-sh/ruff/pull/13539)
-/// Remove `Quoting` when stabilizing this preview style.
-pub(crate) fn is_f_string_implicit_concatenated_string_literal_quotes_enabled(
-    context: &PyFormatContext,
-) -> bool {
-    context.is_preview()
-}
-
-pub(crate) fn is_with_single_item_pre_39_enabled(context: &PyFormatContext) -> bool {
-    context.is_preview()
-}
-
-/// See [#12282](https://github.com/astral-sh/ruff/pull/12282).
-pub(crate) fn is_comprehension_leading_expression_comments_same_line_enabled(
-    context: &PyFormatContext,
-) -> bool {
-    context.is_preview()
-}
-
-/// See [#9447](https://github.com/astral-sh/ruff/issues/9447)
-pub(crate) fn is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled(
-    context: &PyFormatContext,
-) -> bool {
-    context.is_preview()
-}
-
-/// See [#6933](https://github.com/astral-sh/ruff/issues/6933).
-/// This style also covers the black preview styles `remove_redundant_guard_parens` and `parens_for_long_if_clauses_in_case_block `.
-/// WARNING: This preview style depends on `is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled`
-/// because it relies on the new semantic of `IfBreaksParenthesized`.
-pub(crate) fn is_match_case_parentheses_enabled(context: &PyFormatContext) -> bool {
-    context.is_preview()
-}
-
-/// This preview style fixes a bug with the docstring's `line-length` calculation when using the `dynamic` mode.
-/// The new style now respects the indent **inside** the docstring and reduces the `line-length` accordingly
-/// so that the docstring's code block fits into the global line-length setting.
-pub(crate) fn is_docstring_code_block_in_docstring_indent_enabled(
-    context: &PyFormatContext,
-) -> bool {
-    context.is_preview()
-}
-
-/// Returns `true` if implicitly concatenated strings should be joined if they all fit on a single line.
-/// See [#9457](https://github.com/astral-sh/ruff/issues/9457)
-/// WARNING: This preview style depends on `is_empty_parameters_no_unnecessary_parentheses_around_return_value_enabled`
-/// because it relies on the new semantic of `IfBreaksParenthesized`.
-pub(crate) fn is_join_implicit_concatenated_string_enabled(context: &PyFormatContext) -> bool {
-    context.is_preview()
-}
-
 /// Returns `true` if the bugfix for single-with items with a trailing comment targeting Python 3.9 or newer is enabled.
 ///
 /// See [#14001](https://github.com/astral-sh/ruff/issues/14001)

crates/ruff_python_formatter/src/statement/stmt_assert.rs

@@ -3,10 +3,8 @@ use ruff_formatter::write;
 use ruff_python_ast::StmtAssert;
 
 use crate::comments::SourceComment;
-
 use crate::expression::maybe_parenthesize_expression;
 use crate::expression::parentheses::Parenthesize;
-use crate::preview::is_join_implicit_concatenated_string_enabled;
 use crate::{has_skip_comment, prelude::*};
 
 #[derive(Default)]
@@ -30,18 +28,12 @@ impl FormatNodeRule<StmtAssert> for FormatStmtAssert {
         )?;
 
         if let Some(msg) = msg {
-            let parenthesize = if is_join_implicit_concatenated_string_enabled(f.context()) {
-                Parenthesize::IfBreaksParenthesized
-            } else {
-                Parenthesize::IfBreaks
-            };
-
             write!(
                 f,
                 [
                     token(","),
                     space(),
-                    maybe_parenthesize_expression(msg, item, parenthesize),
+                    maybe_parenthesize_expression(msg, item, Parenthesize::IfBreaksParenthesized),
                 ]
             )?;
         }

crates/ruff_python_formatter/src/statement/stmt_assign.rs

@@ -1,7 +1,7 @@
 use ruff_formatter::{format_args, write, FormatError, RemoveSoftLinesBuffer};
 use ruff_python_ast::{
-    AnyNodeRef, Expr, ExprAttribute, ExprCall, FStringPart, Operator, StmtAssign, StringLike,
+    AnyNodeRef, Expr, ExprAttribute, ExprCall, FString, FStringPart, Operator, StmtAssign,
-    TypeParams,
+    StringLike, TypeParams,
 };
 
 use crate::builders::parenthesize_if_expands;
@@ -9,7 +9,6 @@ use crate::comments::{
     trailing_comments, Comments, LeadingDanglingTrailingComments, SourceComment,
 };
 use crate::context::{NodeLevel, WithNodeLevel};
-use crate::expression::expr_f_string::f_string_quoting;
 use crate::expression::parentheses::{
     is_expression_parenthesized, optional_parentheses, NeedsParentheses, OptionalParentheses,
     Parentheses, Parenthesize,
@@ -18,10 +17,7 @@ use crate::expression::{
     can_omit_optional_parentheses, has_own_parentheses, has_parentheses,
     maybe_parenthesize_expression,
 };
-use crate::other::f_string::{FStringLayout, FormatFString};
+use crate::other::f_string::FStringLayout;
-use crate::preview::{
-    is_f_string_formatting_enabled, is_join_implicit_concatenated_string_enabled,
-};
 use crate::statement::trailing_semicolon;
 use crate::string::implicit::{
     FormatImplicitConcatenatedStringExpanded, FormatImplicitConcatenatedStringFlat,
@@ -456,7 +452,7 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                         let f_string_flat = format_with(|f| {
                             let mut buffer = RemoveSoftLinesBuffer::new(&mut *f);
 
-                            write!(buffer, [format_f_string])
+                            write!(buffer, [format_f_string.format()])
                         })
                         .memoized();
 
@@ -518,7 +514,7 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                         // }moreeeeeeeeeeeeeeeee"
                         // ```
                         let format_f_string =
-                            format_with(|f| write!(f, [format_f_string, inline_comments]));
+                            format_with(|f| write!(f, [format_f_string.format(), inline_comments]));
 
                         best_fitting![single_line, joined_parenthesized, format_f_string]
                             .with_mode(BestFittingMode::AllLines)
@@ -668,7 +664,7 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                         // Similar to above, remove any soft line breaks emitted by the f-string
                         // formatting.
                         let mut buffer = RemoveSoftLinesBuffer::new(&mut *f);
-                        write!(buffer, [format_f_string])
+                        write!(buffer, [format_f_string.format()])
                     } else {
                         value.format().with_options(Parentheses::Never).fmt(f)
                     }
@@ -701,20 +697,22 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                 // )
                 // ```
                 let flat_target_parenthesize_value = format_with(|f| {
-                    write!(f, [last_target, space(), operator, space(), token("("),])?;
+                    write!(
-
+                        f,
-                    if is_join_implicit_concatenated_string_enabled(f.context()) {
+                        [
+                            last_target,
+                            space(),
+                            operator,
+                            space(),
+                            token("("),
                             group(&soft_block_indent(&format_args![
                                 format_value,
                                 inline_comments
                             ]))
-                        .should_expand(true)
+                            .should_expand(true),
-                        .fmt(f)?;
+                            token(")")
-                    } else {
+                        ]
-                        block_indent(&format_args![format_value, inline_comments]).fmt(f)?;
+                    )
-                    }
-
-                    token(")").fmt(f)
                 });
 
                 // Fall back to parenthesizing (or splitting) the last target part if we can't make the value
@@ -726,15 +724,16 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                 // ] = c
                 // ```
                 let split_target_flat_value = format_with(|f| {
-                    if is_join_implicit_concatenated_string_enabled(f.context()) {
-                        group(&last_target).should_expand(true).fmt(f)?;
-                    } else {
-                        last_target.fmt(f)?;
-                    }
-
                     write!(
                         f,
-                        [space(), operator, space(), format_value, inline_comments]
+                        [
+                            group(&last_target).should_expand(true),
+                            space(),
+                            operator,
+                            space(),
+                            format_value,
+                            inline_comments
+                        ]
                     )
                 });
 
@@ -935,7 +934,8 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
                     }
 
                     let format_f_string =
-                        format_with(|f| write!(f, [format_f_string, inline_comments])).memoized();
+                        format_with(|f| write!(f, [format_f_string.format(), inline_comments]))
+                            .memoized();
 
                     // Considering the following initial source:
                     //
@@ -1102,11 +1102,7 @@ impl Format<PyFormatContext<'_>> for FormatStatementsLastExpression<'_> {
 fn format_f_string_assignment<'a>(
     string: StringLike<'a>,
     context: &PyFormatContext,
-) -> Option<FormatFString<'a>> {
+) -> Option<&'a FString> {
-    if !is_f_string_formatting_enabled(context) {
-        return None;
-    }
-
     let StringLike::FString(expr) = string else {
         return None;
     };
@@ -1128,10 +1124,7 @@ fn format_f_string_assignment<'a>(
         return None;
     }
 
-    Some(FormatFString::new(
+    Some(f_string)
-        f_string,
-        f_string_quoting(expr, context.source()),
-    ))
 }
 
 #[derive(Debug, Default)]

crates/ruff_python_formatter/src/string/docstring.rs

@@ -18,10 +18,6 @@ use {
     ruff_text_size::{Ranged, TextLen, TextRange, TextSize},
 };
 
-use crate::preview::{
-    is_docstring_code_block_in_docstring_indent_enabled,
-    is_join_implicit_concatenated_string_enabled,
-};
 use crate::string::StringQuotes;
 use crate::{prelude::*, DocstringCodeLineWidth, FormatModuleError};
 
@@ -171,7 +167,7 @@ pub(crate) fn format(normalized: &NormalizedString, f: &mut PyFormatter) -> Form
     if docstring[first.len()..].trim().is_empty() {
         // For `"""\n"""` or other whitespace between the quotes, black keeps a single whitespace,
         // but `""""""` doesn't get one inserted.
-        if needs_chaperone_space(normalized.flags(), trim_end, f.context())
+        if needs_chaperone_space(normalized.flags(), trim_end)
             || (trim_end.is_empty() && !docstring.is_empty())
         {
             space().fmt(f)?;
@@ -211,7 +207,7 @@ pub(crate) fn format(normalized: &NormalizedString, f: &mut PyFormatter) -> Form
     let trim_end = docstring
         .as_ref()
         .trim_end_matches(|c: char| c.is_whitespace() && c != '\n');
-    if needs_chaperone_space(normalized.flags(), trim_end, f.context()) {
+    if needs_chaperone_space(normalized.flags(), trim_end) {
         space().fmt(f)?;
     }
 
@@ -508,7 +504,6 @@ impl<'src> DocstringLinePrinter<'_, '_, '_, 'src> {
                     .to_ascii_spaces(indent_width)
                     .saturating_add(kind.extra_indent_ascii_spaces());
 
-                if is_docstring_code_block_in_docstring_indent_enabled(self.f.context()) {
                 // Add the in-docstring indentation
                 current_indent = current_indent.saturating_add(
                     u16::try_from(
@@ -518,7 +513,6 @@ impl<'src> DocstringLinePrinter<'_, '_, '_, 'src> {
                     )
                     .unwrap_or(u16::MAX),
                 );
-                }
 
                 let width = std::cmp::max(1, global_line_width.saturating_sub(current_indent));
                 LineWidth::try_from(width).expect("width should be capped at a minimum of 1")
@@ -1607,17 +1601,11 @@ fn docstring_format_source(
 /// If the last line of the docstring is `content" """` or `content\ """`, we need a chaperone space
 /// that avoids `content""""` and `content\"""`. This does only applies to un-escaped backslashes,
 /// so `content\\ """` doesn't need a space while `content\\\ """` does.
-pub(super) fn needs_chaperone_space(
+pub(super) fn needs_chaperone_space(flags: AnyStringFlags, trim_end: &str) -> bool {
-    flags: AnyStringFlags,
-    trim_end: &str,
-    context: &PyFormatContext,
-) -> bool {
     if trim_end.chars().rev().take_while(|c| *c == '\\').count() % 2 == 1 {
         true
-    } else if is_join_implicit_concatenated_string_enabled(context) {
-        flags.is_triple_quoted() && trim_end.ends_with(flags.quote_style().as_char())
     } else {
-        trim_end.ends_with(flags.quote_style().as_char())
+        flags.is_triple_quoted() && trim_end.ends_with(flags.quote_style().as_char())
     }
 }
 

crates/ruff_python_formatter/src/string/implicit.rs

@@ -11,13 +11,9 @@ use std::borrow::Cow;
 
 use crate::comments::{leading_comments, trailing_comments};
 use crate::expression::parentheses::in_parentheses_only_soft_line_break_or_space;
-use crate::other::f_string::{FStringContext, FStringLayout, FormatFString};
+use crate::other::f_string::{FStringContext, FStringLayout};
 use crate::other::f_string_element::FormatFStringExpressionElement;
-use crate::other::string_literal::StringLiteralKind;
 use crate::prelude::*;
-use crate::preview::{
-    is_f_string_formatting_enabled, is_join_implicit_concatenated_string_enabled,
-};
 use crate::string::docstring::needs_chaperone_space;
 use crate::string::normalize::{
     is_fstring_with_quoted_debug_expression, is_fstring_with_quoted_format_spec_and_debug,
@@ -82,14 +78,9 @@ impl<'a> FormatImplicitConcatenatedStringExpanded<'a> {
 impl Format<PyFormatContext<'_>> for FormatImplicitConcatenatedStringExpanded<'_> {
     fn fmt(&self, f: &mut Formatter<PyFormatContext<'_>>) -> FormatResult<()> {
         let comments = f.context().comments().clone();
-        let quoting = self.string.quoting(f.context().source());
-
-        let join_implicit_concatenated_string_enabled =
-            is_join_implicit_concatenated_string_enabled(f.context());
 
         // Keep implicit concatenated strings expanded unless they're already written on a single line.
         if matches!(self.layout, ImplicitConcatenatedLayout::Multipart)
-            && join_implicit_concatenated_string_enabled
             && self.string.parts().tuple_windows().any(|(a, b)| {
                 f.context()
                     .source()
@@ -103,23 +94,13 @@ impl Format<PyFormatContext<'_>> for FormatImplicitConcatenatedStringExpanded<'_
 
         for part in self.string.parts() {
             let format_part = format_with(|f: &mut PyFormatter| match part {
-                StringLikePart::String(part) => {
+                StringLikePart::String(part) => part.format().fmt(f),
-                    let kind = if self.string.is_fstring() {
-                        #[allow(deprecated)]
-                        StringLiteralKind::InImplicitlyConcatenatedFString(quoting)
-                    } else {
-                        StringLiteralKind::String
-                    };
-
-                    part.format().with_options(kind).fmt(f)
-                }
                 StringLikePart::Bytes(bytes_literal) => bytes_literal.format().fmt(f),
-                StringLikePart::FString(part) => FormatFString::new(part, quoting).fmt(f),
+                StringLikePart::FString(part) => part.format().fmt(f),
             });
 
             let part_comments = comments.leading_dangling_trailing(&part);
             joiner.entry(&format_args![
-                (!join_implicit_concatenated_string_enabled).then_some(line_suffix_boundary()),
                 leading_comments(part_comments.leading),
                 format_part,
                 trailing_comments(part_comments.trailing)
@@ -149,10 +130,6 @@ impl<'a> FormatImplicitConcatenatedStringFlat<'a> {
     /// Creates a new formatter. Returns `None` if the string can't be merged into a single string.
     pub(crate) fn new(string: StringLike<'a>, context: &PyFormatContext) -> Option<Self> {
         fn merge_flags(string: StringLike, context: &PyFormatContext) -> Option<AnyStringFlags> {
-            if !is_join_implicit_concatenated_string_enabled(context) {
-                return None;
-            }
-
             // Multiline strings can never fit on a single line.
             if string.is_multiline(context) {
                 return None;
@@ -323,7 +300,6 @@ impl Format<PyFormatContext<'_>> for FormatImplicitConcatenatedStringFlat<'_> {
                 }
 
                 StringLikePart::FString(f_string) => {
-                    if is_f_string_formatting_enabled(f.context()) {
                     for element in &f_string.elements {
                         match element {
                             FStringElement::Literal(literal) => {
@@ -341,27 +317,13 @@ impl Format<PyFormatContext<'_>> for FormatImplicitConcatenatedStringFlat<'_> {
                             FStringElement::Expression(expression) => {
                                 let context = FStringContext::new(
                                     self.flags,
-                                        FStringLayout::from_f_string(
+                                    FStringLayout::from_f_string(f_string, f.context().source()),
-                                            f_string,
-                                            f.context().source(),
-                                        ),
                                 );
 
-                                    FormatFStringExpressionElement::new(expression, context)
+                                FormatFStringExpressionElement::new(expression, context).fmt(f)?;
-                                        .fmt(f)?;
                             }
                         }
                     }
-                    } else {
-                        FormatLiteralContent {
-                            range: part.content_range(),
-                            flags: self.flags,
-                            is_fstring: true,
-                            trim_end: false,
-                            trim_start: false,
-                        }
-                        .fmt(f)?;
-                    }
                 }
             }
         }
@@ -386,9 +348,6 @@ impl Format<PyFormatContext<'_>> for FormatLiteralContent {
             0,
             self.flags,
             self.flags.is_f_string() && !self.is_fstring,
-            // TODO: Remove the argument from `normalize_string` when promoting the `is_f_string_formatting_enabled` preview style.
-            self.flags.is_f_string() && !is_f_string_formatting_enabled(f.context()),
-            is_f_string_formatting_enabled(f.context()),
         );
 
         // Trim the start and end of the string if it's the first or last part of a docstring.
@@ -413,7 +372,7 @@ impl Format<PyFormatContext<'_>> for FormatLiteralContent {
                 Cow::Owned(normalized) => text(normalized).fmt(f)?,
             }
 
-            if self.trim_end && needs_chaperone_space(self.flags, &normalized, f.context()) {
+            if self.trim_end && needs_chaperone_space(self.flags, &normalized) {
                 space().fmt(f)?;
             }
         }

crates/ruff_python_formatter/src/string/mod.rs

@@ -10,22 +10,13 @@ use ruff_python_ast::{
 use ruff_source_file::LineRanges;
 use ruff_text_size::Ranged;
 
-use crate::expression::expr_f_string::f_string_quoting;
 use crate::prelude::*;
-use crate::preview::is_f_string_formatting_enabled;
 use crate::QuoteStyle;
 
 pub(crate) mod docstring;
 pub(crate) mod implicit;
 mod normalize;
 
-#[derive(Copy, Clone, Debug, Default)]
-pub(crate) enum Quoting {
-    #[default]
-    CanChange,
-    Preserve,
-}
-
 impl Format<PyFormatContext<'_>> for AnyStringPrefix {
     fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
         // Remove the unicode prefix `u` if any because it is meaningless in Python 3+.
@@ -90,19 +81,10 @@ impl From<Quote> for QuoteStyle {
 
 // Extension trait that adds formatter specific helper methods to `StringLike`.
 pub(crate) trait StringLikeExtensions {
-    fn quoting(&self, source: &str) -> Quoting;
-
     fn is_multiline(&self, context: &PyFormatContext) -> bool;
 }
 
 impl StringLikeExtensions for ast::StringLike<'_> {
-    fn quoting(&self, source: &str) -> Quoting {
-        match self {
-            Self::String(_) | Self::Bytes(_) => Quoting::CanChange,
-            Self::FString(f_string) => f_string_quoting(f_string, source),
-        }
-    }
-
     fn is_multiline(&self, context: &PyFormatContext) -> bool {
         self.parts().any(|part| match part {
             StringLikePart::String(_) | StringLikePart::Bytes(_) => {
@@ -149,15 +131,11 @@ impl StringLikeExtensions for ast::StringLike<'_> {
                     })
                 }
 
-                if is_f_string_formatting_enabled(context) {
                 contains_line_break_or_comments(
                     &f_string.elements,
                     context,
                     f_string.flags.is_triple_quoted(),
                 )
-                } else {
-                    context.source().contains_line_break(f_string.range())
-                }
             }
         })
     }

crates/ruff_python_formatter/src/string/normalize.rs

@@ -12,12 +12,10 @@ use ruff_text_size::{Ranged, TextRange, TextSlice};
 
 use crate::context::FStringState;
 use crate::prelude::*;
-use crate::preview::is_f_string_formatting_enabled;
+use crate::string::StringQuotes;
-use crate::string::{Quoting, StringQuotes};
 use crate::QuoteStyle;
 
 pub(crate) struct StringNormalizer<'a, 'src> {
-    quoting: Quoting,
     preferred_quote_style: Option<QuoteStyle>,
     context: &'a PyFormatContext<'src>,
 }
@@ -25,7 +23,6 @@ pub(crate) struct StringNormalizer<'a, 'src> {
 impl<'a, 'src> StringNormalizer<'a, 'src> {
     pub(crate) fn from_context(context: &'a PyFormatContext<'src>) -> Self {
         Self {
-            quoting: Quoting::default(),
             preferred_quote_style: None,
             context,
         }
@@ -36,11 +33,6 @@ impl<'a, 'src> StringNormalizer<'a, 'src> {
         self
     }
 
-    pub(crate) fn with_quoting(mut self, quoting: Quoting) -> Self {
-        self.quoting = quoting;
-        self
-    }
-
     /// Determines the preferred quote style for `string`.
     /// The formatter should use the preferred quote style unless
     /// it can't because the string contains the preferred quotes OR
@@ -49,9 +41,6 @@ impl<'a, 'src> StringNormalizer<'a, 'src> {
     /// Note: If you add more cases here where we return `QuoteStyle::Preserve`,
     /// make sure to also add them to [`FormatImplicitConcatenatedStringFlat::new`].
     pub(super) fn preferred_quote_style(&self, string: StringLikePart) -> QuoteStyle {
-        match self.quoting {
-            Quoting::Preserve => QuoteStyle::Preserve,
-            Quoting::CanChange => {
         let preferred_quote_style = self
             .preferred_quote_style
             .unwrap_or(self.context.options().quote_style());
@@ -89,8 +78,7 @@ impl<'a, 'src> StringNormalizer<'a, 'src> {
         }
 
         // For f-strings prefer alternating the quotes unless The outer string is triple quoted and the inner isn't.
-                if let FStringState::InsideExpressionElement(parent_context) =
+        if let FStringState::InsideExpressionElement(parent_context) = self.context.f_string_state()
-                    self.context.f_string_state()
         {
             let parent_flags = parent_context.f_string().flags();
 
@@ -155,15 +143,13 @@ impl<'a, 'src> StringNormalizer<'a, 'src> {
             preferred_quote_style
         }
     }
-        }
-    }
 
     /// Computes the strings preferred quotes.
     pub(crate) fn choose_quotes(&self, string: StringLikePart) -> QuoteSelection {
         let raw_content = &self.context.source()[string.content_range()];
         let first_quote_or_normalized_char_offset = raw_content
             .bytes()
-            .position(|b| matches!(b, b'\\' | b'"' | b'\'' | b'\r' | b'{'));
+            .position(|b| matches!(b, b'\\' | b'"' | b'\'' | b'\r'));
         let string_flags = string.flags();
         let preferred_style = self.preferred_quote_style(string);
 
@@ -214,11 +200,7 @@ impl<'a, 'src> StringNormalizer<'a, 'src> {
                 raw_content,
                 first_quote_or_escape_offset,
                 quote_selection.flags,
-                // TODO: Remove the `b'{'` in `choose_quotes` when promoting the
-                // `format_fstring` preview style
                 false,
-                false,
-                is_f_string_formatting_enabled(self.context),
             )
         } else {
             Cow::Borrowed(raw_content)
@@ -269,7 +251,6 @@ impl QuoteMetadata {
                 Self::from_str(text, part.flags(), preferred_quote)
             }
             StringLikePart::FString(fstring) => {
-                if is_f_string_formatting_enabled(context) {
                 let metadata = QuoteMetadata::from_str("", part.flags(), preferred_quote);
 
                 metadata.merge_fstring_elements(
@@ -278,11 +259,6 @@ impl QuoteMetadata {
                     context,
                     preferred_quote,
                 )
-                } else {
-                    let text = &context.source()[part.content_range()];
-
-                    Self::from_str(text, part.flags(), preferred_quote)
-                }
             }
         }
     }
@@ -635,8 +611,6 @@ pub(crate) fn normalize_string(
     start_offset: usize,
     new_flags: AnyStringFlags,
     escape_braces: bool,
-    flip_nested_fstring_quotes: bool,
-    format_f_string: bool,
 ) -> Cow<str> {
     // The normalized string if `input` is not yet normalized.
     // `output` must remain empty if `input` is already normalized.
@@ -653,9 +627,6 @@ pub(crate) fn normalize_string(
 
     let is_raw = new_flags.is_raw_string();
 
-    let is_fstring = !format_f_string && new_flags.is_f_string();
-    let mut formatted_value_nesting = 0u32;
-
     while let Some((index, c)) = chars.next() {
         if matches!(c, '{' | '}') {
             if escape_braces {
@@ -664,17 +635,6 @@ pub(crate) fn normalize_string(
                 output.push(c);
                 last_index = index + c.len_utf8();
                 continue;
-            } else if is_fstring {
-                if chars.peek().copied().is_some_and(|(_, next)| next == c) {
-                    // Skip over the second character of the double braces
-                    chars.next();
-                } else if c == '{' {
-                    formatted_value_nesting += 1;
-                } else {
-                    // Safe to assume that `c == '}'` here because of the matched pattern above
-                    formatted_value_nesting = formatted_value_nesting.saturating_sub(1);
-                }
-                continue;
             }
         }
 
@@ -723,7 +683,7 @@ pub(crate) fn normalize_string(
 
                     if !new_flags.is_triple_quoted() {
                         #[allow(clippy::if_same_then_else)]
-                        if next == opposite_quote && formatted_value_nesting == 0 {
+                        if next == opposite_quote {
                             // Remove the escape by ending before the backslash and starting again with the quote
                             chars.next();
                             output.push_str(&input[last_index..index]);
@@ -734,23 +694,12 @@ pub(crate) fn normalize_string(
                         }
                     }
                 }
-            } else if !new_flags.is_triple_quoted()
+            } else if !new_flags.is_triple_quoted() && c == preferred_quote {
-                && c == preferred_quote
-                && formatted_value_nesting == 0
-            {
                 // Escape the quote
                 output.push_str(&input[last_index..index]);
                 output.push('\\');
                 output.push(c);
                 last_index = index + preferred_quote.len_utf8();
-            } else if c == preferred_quote
-                && flip_nested_fstring_quotes
-                && formatted_value_nesting > 0
-            {
-                // Flip the quotes
-                output.push_str(&input[last_index..index]);
-                output.push(opposite_quote);
-                last_index = index + preferred_quote.len_utf8();
             }
         }
     }
@@ -1099,7 +1048,6 @@ fn contains_opposite_quote(content: &str, flags: AnyStringFlags) -> bool {
 mod tests {
     use std::borrow::Cow;
 
-    use ruff_python_ast::str_prefix::FStringPrefix;
     use ruff_python_ast::{
         str::Quote,
         str_prefix::{AnyStringPrefix, ByteStringPrefix},
@@ -1133,34 +1081,8 @@ mod tests {
                 false,
             ),
             false,
-            false,
-            true,
         );
 
         assert_eq!(r"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", &normalized);
     }
-
-    #[test]
-    fn normalize_nested_fstring() {
-        let input =
-            r#"With single quote: '  {my_dict['foo']} With double quote: "  {my_dict["bar"]}"#;
-
-        let normalized = normalize_string(
-            input,
-            0,
-            AnyStringFlags::new(
-                AnyStringPrefix::Format(FStringPrefix::Regular),
-                Quote::Double,
-                false,
-            ),
-            false,
-            true,
-            false,
-        );
-
-        assert_eq!(
-            "With single quote: '  {my_dict['foo']} With double quote: \\\"  {my_dict['bar']}",
-            &normalized
-        );
-    }
 }

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__composition.py.snap

@@ -194,41 +194,7 @@ class C:
 ```diff
 --- Black
 +++ Ruff
-@@ -110,19 +110,20 @@
+@@ -161,9 +161,7 @@
-             value, is_going_to_be="too long to fit in a single line", srsly=True
-         ), "Not what we expected"
- 
--        assert {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        } == expected, (
--            "Not what we expected and the message is too long to fit in one line"
--        )
-+        assert (
-+            {
-+                key1: value1,
-+                key2: value2,
-+                key3: value3,
-+                key4: value4,
-+                key5: value5,
-+                key6: value6,
-+                key7: value7,
-+                key8: value8,
-+                key9: value9,
-+            }
-+            == expected
-+        ), "Not what we expected and the message is too long to fit in one line"
- 
-         assert expected(
-             value, is_going_to_be="too long to fit in a single line", srsly=True
-@@ -161,9 +162,7 @@
                        8 STORE_ATTR               0 (x)
                       10 LOAD_CONST               0 (None)
                       12 RETURN_VALUE
@@ -356,8 +322,7 @@ class C:
             value, is_going_to_be="too long to fit in a single line", srsly=True
         ), "Not what we expected"
 
-        assert (
+        assert {
-            {
             key1: value1,
             key2: value2,
             key3: value3,
@@ -367,9 +332,9 @@ class C:
             key7: value7,
             key8: value8,
             key9: value9,
-            }
+        } == expected, (
-            == expected
+            "Not what we expected and the message is too long to fit in one line"
-        ), "Not what we expected and the message is too long to fit in one line"
+        )
 
         assert expected(
             value, is_going_to_be="too long to fit in a single line", srsly=True

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__composition_no_trailing_comma.py.snap

@@ -194,41 +194,7 @@ class C:
 ```diff
 --- Black
 +++ Ruff
-@@ -110,19 +110,20 @@
+@@ -161,9 +161,7 @@
-             value, is_going_to_be="too long to fit in a single line", srsly=True
-         ), "Not what we expected"
- 
--        assert {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        } == expected, (
--            "Not what we expected and the message is too long to fit in one line"
--        )
-+        assert (
-+            {
-+                key1: value1,
-+                key2: value2,
-+                key3: value3,
-+                key4: value4,
-+                key5: value5,
-+                key6: value6,
-+                key7: value7,
-+                key8: value8,
-+                key9: value9,
-+            }
-+            == expected
-+        ), "Not what we expected and the message is too long to fit in one line"
- 
-         assert expected(
-             value, is_going_to_be="too long to fit in a single line", srsly=True
-@@ -161,9 +162,7 @@
                        8 STORE_ATTR               0 (x)
                       10 LOAD_CONST               0 (None)
                       12 RETURN_VALUE
@@ -356,8 +322,7 @@ class C:
             value, is_going_to_be="too long to fit in a single line", srsly=True
         ), "Not what we expected"
 
-        assert (
+        assert {
-            {
             key1: value1,
             key2: value2,
             key3: value3,
@@ -367,9 +332,9 @@ class C:
             key7: value7,
             key8: value8,
             key9: value9,
-            }
+        } == expected, (
-            == expected
+            "Not what we expected and the message is too long to fit in one line"
-        ), "Not what we expected and the message is too long to fit in one line"
+        )
 
         assert expected(
             value, is_going_to_be="too long to fit in a single line", srsly=True

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__expression.py.snap

@@ -276,6 +276,19 @@ last_call()
  )  # note: no trailing comma pre-3.6
  call(*gidgets[:2])
  call(a, *gidgets[:2])
+@@ -251,9 +251,9 @@
+ print(**{1: 3} if False else {x: x for x in range(3)})
+ print(*lambda x: x)
+ assert not Test, "Short message"
+-assert this is ComplexTest and not requirements.fit_in_a_single_line(
+-    force=False
+-), "Short message"
++assert this is ComplexTest and not requirements.fit_in_a_single_line(force=False), (
++    "Short message"
++)
+ assert parens is TooMany
+ for (x,) in (1,), (2,), (3,):
+     ...
 ```
 
 ## Ruff Output
@@ -534,9 +547,9 @@ print(*[] or [1])
 print(**{1: 3} if False else {x: x for x in range(3)})
 print(*lambda x: x)
 assert not Test, "Short message"
-assert this is ComplexTest and not requirements.fit_in_a_single_line(
+assert this is ComplexTest and not requirements.fit_in_a_single_line(force=False), (
-    force=False
+    "Short message"
-), "Short message"
+)
 assert parens is TooMany
 for (x,) in (1,), (2,), (3,):
     ...

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__f_docstring.py.snap

@@ -0,0 +1,66 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/black/cases/f_docstring.py
+---
+## Input
+
+```python
+def foo(e):
+    f""" {'.'.join(e)}"""
+
+def bar(e):
+    f"{'.'.join(e)}"
+
+def baz(e):
+    F""" {'.'.join(e)}"""
+```
+
+## Black Differences
+
+```diff
+--- Black
++++ Ruff
+@@ -1,5 +1,5 @@
+ def foo(e):
+-    f""" {'.'.join(e)}"""
++    f""" {".".join(e)}"""
+ 
+ 
+ def bar(e):
+@@ -7,4 +7,4 @@
+ 
+ 
+ def baz(e):
+-    f""" {'.'.join(e)}"""
++    f""" {".".join(e)}"""
+```
+
+## Ruff Output
+
+```python
+def foo(e):
+    f""" {".".join(e)}"""
+
+
+def bar(e):
+    f"{'.'.join(e)}"
+
+
+def baz(e):
+    f""" {".".join(e)}"""
+```
+
+## Black Output
+
+```python
+def foo(e):
+    f""" {'.'.join(e)}"""
+
+
+def bar(e):
+    f"{'.'.join(e)}"
+
+
+def baz(e):
+    f""" {'.'.join(e)}"""
+```

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__fmtonoff5.py.snap

@@ -105,7 +105,7 @@ elif   unformatted:
 -            "=foo.bar.:main",
 -        # fmt: on
 -            ]  # Includes an formatted indentation.
-+            "foo-bar" "=foo.bar.:main",
++            "foo-bar=foo.bar.:main",
 +            # fmt: on
 +        ]  # Includes an formatted indentation.
      },
@@ -129,7 +129,7 @@ setup(
     entry_points={
         # fmt: off
         "console_scripts": [
-            "foo-bar" "=foo.bar.:main",
+            "foo-bar=foo.bar.:main",
             # fmt: on
         ]  # Includes an formatted indentation.
     },

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__fstring.py.snap

@@ -0,0 +1,74 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/black/cases/fstring.py
+---
+## Input
+
+```python
+f"f-string without formatted values is just a string"
+f"{{NOT a formatted value}}"
+f"{{NOT 'a' \"formatted\" \"value\"}}"
+f"some f-string with {a} {few():.2f} {formatted.values!r}"
+f'some f-string with {a} {few(""):.2f} {formatted.values!r}'
+f"{f'''{'nested'} inner'''} outer"
+f"\"{f'{nested} inner'}\" outer"
+f"space between opening braces: { {a for a in (1, 2, 3)}}"
+f'Hello \'{tricky + "example"}\''
+f"Tried directories {str(rootdirs)} \
+but none started with prefix {parentdir_prefix}"
+```
+
+## Black Differences
+
+```diff
+--- Black
++++ Ruff
+@@ -2,10 +2,10 @@
+ f"{{NOT a formatted value}}"
+ f'{{NOT \'a\' "formatted" "value"}}'
+ f"some f-string with {a} {few():.2f} {formatted.values!r}"
+-f'some f-string with {a} {few(""):.2f} {formatted.values!r}'
+-f"{f'''{'nested'} inner'''} outer"
+-f"\"{f'{nested} inner'}\" outer"
+-f"space between opening braces: { {a for a in (1, 2, 3)}}"
+-f'Hello \'{tricky + "example"}\''
++f"some f-string with {a} {few(''):.2f} {formatted.values!r}"
++f"{f'''{"nested"} inner'''} outer"
++f'"{f"{nested} inner"}" outer'
++f"space between opening braces: { {a for a in (1, 2, 3)} }"
++f"Hello '{tricky + 'example'}'"
+ f"Tried directories {str(rootdirs)} \
+ but none started with prefix {parentdir_prefix}"
+```
+
+## Ruff Output
+
+```python
+f"f-string without formatted values is just a string"
+f"{{NOT a formatted value}}"
+f'{{NOT \'a\' "formatted" "value"}}'
+f"some f-string with {a} {few():.2f} {formatted.values!r}"
+f"some f-string with {a} {few(''):.2f} {formatted.values!r}"
+f"{f'''{"nested"} inner'''} outer"
+f'"{f"{nested} inner"}" outer'
+f"space between opening braces: { {a for a in (1, 2, 3)} }"
+f"Hello '{tricky + 'example'}'"
+f"Tried directories {str(rootdirs)} \
+but none started with prefix {parentdir_prefix}"
+```
+
+## Black Output
+
+```python
+f"f-string without formatted values is just a string"
+f"{{NOT a formatted value}}"
+f'{{NOT \'a\' "formatted" "value"}}'
+f"some f-string with {a} {few():.2f} {formatted.values!r}"
+f'some f-string with {a} {few(""):.2f} {formatted.values!r}'
+f"{f'''{'nested'} inner'''} outer"
+f"\"{f'{nested} inner'}\" outer"
+f"space between opening braces: { {a for a in (1, 2, 3)}}"
+f'Hello \'{tricky + "example"}\''
+f"Tried directories {str(rootdirs)} \
+but none started with prefix {parentdir_prefix}"
+```

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__function_trailing_comma.py.snap

@@ -132,6 +132,19 @@ variable: (
 ```diff
 --- Black
 +++ Ruff
+@@ -52,9 +52,9 @@
+         pass
+ 
+ 
+-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+-    Set["xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"]
+-):
++def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
++    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
++]:
+     json = {
+         "k": {
+             "k2": {
 @@ -130,9 +130,7 @@
  
  def foo() -> (
@@ -225,9 +238,9 @@ def f(
         pass
 
 
-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-    Set["xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"]
+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-):
+]:
     json = {
         "k": {
             "k2": {

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__long_strings_flag_disabled.py.snap

@@ -309,33 +309,52 @@ long_unmergable_string_with_pragma = (
 ```diff
 --- Black
 +++ Ruff
-@@ -167,13 +167,9 @@
+@@ -167,14 +167,14 @@
  
  triple_quote_string = """This is a really really really long triple quote string assignment and it should not be touched."""
  
 -assert (
 -    some_type_of_boolean_expression
 -), "Followed by a really really really long string that is used to provide context to the AssertionError exception."
-+assert some_type_of_boolean_expression, "Followed by a really really really long string that is used to provide context to the AssertionError exception."
++assert some_type_of_boolean_expression, (
++    "Followed by a really really really long string that is used to provide context to the AssertionError exception."
++)
  
 -assert (
 -    some_type_of_boolean_expression
 -), "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string {}.".format(
-+assert some_type_of_boolean_expression, "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string {}.".format(
+-    "formatting"
-     "formatting"
++assert some_type_of_boolean_expression, (
++    "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string {}.".format(
++        "formatting"
++    )
  )
  
-@@ -256,9 +252,7 @@
+ assert some_type_of_boolean_expression, (
+@@ -255,10 +255,8 @@
+     + " that has been "
      + CONCATENATED
      + "using the '+' operator."
- )
+-)
 -annotated_variable: Final = (
 -    "This is a large string that has a type annotation attached to it. A type annotation should NOT stop a long string from being wrapped."
--)
+ )
 +annotated_variable: Final = "This is a large string that has a type annotation attached to it. A type annotation should NOT stop a long string from being wrapped."
  annotated_variable: Literal["fakse_literal"] = (
      "This is a large string that has a type annotation attached to it. A type annotation should NOT stop a long string from being wrapped."
  )
+@@ -267,9 +265,9 @@
+ backslashes = "This is a really long string with \"embedded\" double quotes and 'single' quotes that also handles checking for an even number of backslashes \\\\"
+ backslashes = "This is a really 'long' string with \"embedded double quotes\" and 'single' quotes that also handles checking for an odd number of backslashes \\\", like this...\\\\\\"
+ 
+-short_string = "Hi" " there."
++short_string = "Hi there."
+ 
+-func_call(short_string=("Hi" " there."))
++func_call(short_string=("Hi there."))
+ 
+ raw_strings = r"Don't" " get" r" merged" " unless they are all raw."
+ 
 ```
 
 ## Ruff Output
@@ -510,11 +529,15 @@ pragma_comment_string2 = "Lines which end with an inline pragma comment of the f
 
 triple_quote_string = """This is a really really really long triple quote string assignment and it should not be touched."""
 
-assert some_type_of_boolean_expression, "Followed by a really really really long string that is used to provide context to the AssertionError exception."
+assert some_type_of_boolean_expression, (
+    "Followed by a really really really long string that is used to provide context to the AssertionError exception."
+)
 
-assert some_type_of_boolean_expression, "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string {}.".format(
+assert some_type_of_boolean_expression, (
+    "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string {}.".format(
         "formatting"
     )
+)
 
 assert some_type_of_boolean_expression, (
     "Followed by a really really really long string that is used to provide context to the AssertionError exception, which uses dynamic string %s."
@@ -604,9 +627,9 @@ backslashes = "This is a really long string with \"embedded\" double quotes and
 backslashes = "This is a really long string with \"embedded\" double quotes and 'single' quotes that also handles checking for an even number of backslashes \\\\"
 backslashes = "This is a really 'long' string with \"embedded double quotes\" and 'single' quotes that also handles checking for an odd number of backslashes \\\", like this...\\\\\\"
 
-short_string = "Hi" " there."
+short_string = "Hi there."
 
-func_call(short_string=("Hi" " there."))
+func_call(short_string=("Hi there."))
 
 raw_strings = r"Don't" " get" r" merged" " unless they are all raw."
 

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__pep_572_remove_parens.py.snap

@@ -0,0 +1,241 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/black/cases/pep_572_remove_parens.py
+---
+## Input
+
+```python
+if (foo := 0):
+    pass
+
+if (foo := 1):
+    pass
+
+if (y := 5 + 5):
+    pass
+
+y = (x := 0)
+
+y += (x := 0)
+
+(y := 5 + 5)
+
+test: int = (test2 := 2)
+
+a, b = (test := (1, 2))
+
+# see also https://github.com/psf/black/issues/2139
+assert (foo := 42 - 12)
+
+foo(x=(y := f(x)))
+
+
+def foo(answer=(p := 42)):
+    ...
+
+
+def foo2(answer: (p := 42) = 5):
+    ...
+
+
+lambda: (x := 1)
+
+a[(x := 12)]
+a[:(x := 13)]
+
+# we don't touch expressions in f-strings but if we do one day, don't break 'em
+f'{(x:=10)}'
+
+
+def a():
+    return (x := 3)
+    await (b := 1)
+    yield (a := 2)
+    raise (c := 3)
+
+def this_is_so_dumb() -> (please := no):
+    pass
+
+async def await_the_walrus():
+    with (x := y):
+        pass
+
+    with (x := y) as z, (a := b) as c:
+        pass
+
+    with (x := await y):
+        pass
+
+    with (x := await a, y := await b):
+        pass
+
+    with ((x := await a, y := await b)):
+        pass
+
+    with (x := await a), (y := await b):
+        pass
+```
+
+## Black Differences
+
+```diff
+--- Black
++++ Ruff
+@@ -35,7 +35,7 @@
+ a[: (x := 13)]
+ 
+ # we don't touch expressions in f-strings but if we do one day, don't break 'em
+-f"{(x:=10)}"
++f"{(x := 10)}"
+ 
+ 
+ def a():
+```
+
+## Ruff Output
+
+```python
+if foo := 0:
+    pass
+
+if foo := 1:
+    pass
+
+if y := 5 + 5:
+    pass
+
+y = (x := 0)
+
+y += (x := 0)
+
+(y := 5 + 5)
+
+test: int = (test2 := 2)
+
+a, b = (test := (1, 2))
+
+# see also https://github.com/psf/black/issues/2139
+assert (foo := 42 - 12)
+
+foo(x=(y := f(x)))
+
+
+def foo(answer=(p := 42)): ...
+
+
+def foo2(answer: (p := 42) = 5): ...
+
+
+lambda: (x := 1)
+
+a[(x := 12)]
+a[: (x := 13)]
+
+# we don't touch expressions in f-strings but if we do one day, don't break 'em
+f"{(x := 10)}"
+
+
+def a():
+    return (x := 3)
+    await (b := 1)
+    yield (a := 2)
+    raise (c := 3)
+
+
+def this_is_so_dumb() -> (please := no):
+    pass
+
+
+async def await_the_walrus():
+    with (x := y):
+        pass
+
+    with (x := y) as z, (a := b) as c:
+        pass
+
+    with (x := await y):
+        pass
+
+    with (x := await a, y := await b):
+        pass
+
+    with (x := await a, y := await b):
+        pass
+
+    with (x := await a), (y := await b):
+        pass
+```
+
+## Black Output
+
+```python
+if foo := 0:
+    pass
+
+if foo := 1:
+    pass
+
+if y := 5 + 5:
+    pass
+
+y = (x := 0)
+
+y += (x := 0)
+
+(y := 5 + 5)
+
+test: int = (test2 := 2)
+
+a, b = (test := (1, 2))
+
+# see also https://github.com/psf/black/issues/2139
+assert (foo := 42 - 12)
+
+foo(x=(y := f(x)))
+
+
+def foo(answer=(p := 42)): ...
+
+
+def foo2(answer: (p := 42) = 5): ...
+
+
+lambda: (x := 1)
+
+a[(x := 12)]
+a[: (x := 13)]
+
+# we don't touch expressions in f-strings but if we do one day, don't break 'em
+f"{(x:=10)}"
+
+
+def a():
+    return (x := 3)
+    await (b := 1)
+    yield (a := 2)
+    raise (c := 3)
+
+
+def this_is_so_dumb() -> (please := no):
+    pass
+
+
+async def await_the_walrus():
+    with (x := y):
+        pass
+
+    with (x := y) as z, (a := b) as c:
+        pass
+
+    with (x := await y):
+        pass
+
+    with (x := await a, y := await b):
+        pass
+
+    with (x := await a, y := await b):
+        pass
+
+    with (x := await a), (y := await b):
+        pass
+```

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__pep_701.py.snap

@@ -149,15 +149,155 @@ rf"\{"a"}"
 ```diff
 --- Black
 +++ Ruff
-@@ -119,7 +119,7 @@
+@@ -11,16 +11,14 @@
+ # edge case: FSTRING_MIDDLE containing only whitespace should not be stripped
+ x = f"{a} {b}"
+ 
+-x = f"foo {
+-    2 + 2
+-} bar baz"
++x = f"foo {2 + 2} bar baz"
+ 
+-x = f"foo {{ {"a  {2 + 2}  b"}bar {{ baz"
++x = f"foo {{ {'a  {2 + 2}  b'}bar {{ baz"
++x = f"foo {{ {f'a  {2 + 2}  b'}bar {{ baz"
+ x = f"foo {{ {f'a  {2 + 2}  b'}bar {{ baz"
+-x = f"foo {{ {f"a  {2 + 2}  b"}bar {{ baz"
+ 
+ x = f"foo {{ {f'a  {f"a  {2 + 2}  b"}  b'}bar {{ baz"
+-x = f"foo {{ {f"a  {f"a  {2 + 2}  b"}  b"}bar {{ baz"
++x = f"foo {{ {f'a  {f"a  {2 + 2}  b"}  b'}bar {{ baz"
+ 
+ x = """foo {{ {2 + 2}bar
+ baz"""
+@@ -28,74 +26,62 @@
+ 
+ x = f"""foo {{ {2 + 2}bar {{ baz"""
+ 
+-x = f"""foo {{ {
+-    2 + 2
+-}bar {{ baz"""
++x = f"""foo {{ {2 + 2}bar {{ baz"""
+ 
+ 
+-x = f"""foo {{ {
+-    2 + 2
+-}bar
++x = f"""foo {{ {2 + 2}bar
+ baz"""
+ 
+ x = f"""foo {{ a
+     foo {2 + 2}bar {{ baz
+ 
+     x = f"foo {{ {
+-        2 + 2  # comment
+-    }bar"
++    2 + 2  # comment
++}bar"
+ 
+     {{ baz
+ 
+     }} buzz
+ 
+-    {print("abc" + "def"
+-)}
++    {print("abc" + "def")}
+ abc"""
+ 
+ # edge case: end triple quotes at index zero
+-f"""foo {2+2} bar
++f"""foo {2 + 2} bar
+ """
+ 
+-f' \' {f"'"} \' '
+-f" \" {f'"'} \" "
++f" ' {f"'"} ' "
++f' " {f'"'} " '
+ 
+-x = f"a{2+2:=^72}b"
+-x = f"a{2+2:x}b"
++x = f"a{2 + 2:=^72}b"
++x = f"a{2 + 2:x}b"
+ 
+ rf"foo"
+ rf"{foo}"
+ 
+ f"{x:{y}d}"
+ 
+-x = f"a{2+2:=^{x}}b"
+-x = f"a{2+2:=^{foo(x+y**2):something else}}b"
+-x = f"a{2+2:=^{foo(x+y**2):something else}one more}b"
+-f"{(abc:=10)}"
++x = f"a{2 + 2:=^{x}}b"
++x = f"a{2 + 2:=^{foo(x + y**2):something else}}b"
++x = f"a{2 + 2:=^{foo(x + y**2):something else}one more}b"
++f"{(abc := 10)}"
+ 
+-f"This is a really long string, but just make sure that you reflow fstrings {
+-    2+2:d
+-}"
+-f"This is a really long string, but just make sure that you reflow fstrings correctly {2+2:d}"
++f"This is a really long string, but just make sure that you reflow fstrings {2 + 2:d}"
++f"This is a really long string, but just make sure that you reflow fstrings correctly {2 + 2:d}"
+ 
+ f"{2+2=}"
+ f"{2+2    =    }"
+ f"{     2      +     2    =    }"
+ 
+-f"""foo {
+-    datetime.datetime.now():%Y
++f"""foo {datetime.datetime.now():%Y
+ %m
+ %d
+ }"""
+ 
+-f"{
+-X
+-!r
+-}"
++f"{X!r}"
+ 
+ raise ValueError(
+-    "xxxxxxxxxxxIncorrect --line-ranges format, expect START-END, found"
+-    f" {lines_str!r}"
++    f"xxxxxxxxxxxIncorrect --line-ranges format, expect START-END, found {lines_str!r}"
  )
  
- f"{1:{f'{2}'}}"
+ f"`escape` only permitted in {{'html', 'latex', 'latex-math'}}, \
--f"{1:{f'{2}'}}"
+@@ -105,8 +91,10 @@
-+f'{1:{f'{2}'}}'
+ rf"\{{\}}"
- f"{1:{2}d}"
+ 
+ f"""
+-    WITH {f'''
+-    {1}_cte AS ()'''}
++    WITH {
++    f'''
++    {1}_cte AS ()'''
++}
+ """
+ 
+ value: str = f"""foo
+@@ -124,13 +112,15 @@
  
  f'{{\\"kind\\":\\"ConfigMap\\",\\"metadata\\":{{\\"annotations\\":{{}},\\"name\\":\\"cluster-info\\",\\"namespace\\":\\"amazon-cloudwatch\\"}}}}'
+ 
+-f"""{'''
+-'''}"""
++f"""{
++    '''
++'''
++}"""
+ 
+-f"{'\''}"
+-f"{f'\''}"
++f"{"'"}"
++f"{f"'"}"
+ 
+ f"{1}\{{"
+ f"{2} foo \{{[\}}"
+ f"\{3}"
+-rf"\{"a"}"
++rf"\{'a'}"
 ```
 
 ## Ruff Output
@@ -176,16 +316,14 @@ x = f"""foo {{ {2 + 2}bar {{ baz"""
 # edge case: FSTRING_MIDDLE containing only whitespace should not be stripped
 x = f"{a} {b}"
 
-x = f"foo {
+x = f"foo {2 + 2} bar baz"
-    2 + 2
-} bar baz"
 
-x = f"foo {{ {"a  {2 + 2}  b"}bar {{ baz"
+x = f"foo {{ {'a  {2 + 2}  b'}bar {{ baz"
+x = f"foo {{ {f'a  {2 + 2}  b'}bar {{ baz"
 x = f"foo {{ {f'a  {2 + 2}  b'}bar {{ baz"
-x = f"foo {{ {f"a  {2 + 2}  b"}bar {{ baz"
 
 x = f"foo {{ {f'a  {f"a  {2 + 2}  b"}  b'}bar {{ baz"
-x = f"foo {{ {f"a  {f"a  {2 + 2}  b"}  b"}bar {{ baz"
+x = f"foo {{ {f'a  {f"a  {2 + 2}  b"}  b'}bar {{ baz"
 
 x = """foo {{ {2 + 2}bar
 baz"""
@@ -193,14 +331,10 @@ baz"""
 
 x = f"""foo {{ {2 + 2}bar {{ baz"""
 
-x = f"""foo {{ {
+x = f"""foo {{ {2 + 2}bar {{ baz"""
-    2 + 2
-}bar {{ baz"""
 
 
-x = f"""foo {{ {
+x = f"""foo {{ {2 + 2}bar
-    2 + 2
-}bar
 baz"""
 
 x = f"""foo {{ a
@@ -214,16 +348,15 @@ x = f"""foo {{ a
 
     }} buzz
 
-    {print("abc" + "def"
+    {print("abc" + "def")}
-)}
 abc"""
 
 # edge case: end triple quotes at index zero
 f"""foo {2 + 2} bar
 """
 
-f' \' {f"'"} \' '
+f" ' {f"'"} ' "
-f" \" {f'"'} \" "
+f' " {f'"'} " '
 
 x = f"a{2 + 2:=^72}b"
 x = f"a{2 + 2:x}b"
@@ -238,29 +371,22 @@ x = f"a{2+2:=^{foo(x+y**2):something else}}b"
 x = f"a{2 + 2:=^{foo(x + y**2):something else}one more}b"
 f"{(abc := 10)}"
 
-f"This is a really long string, but just make sure that you reflow fstrings {
+f"This is a really long string, but just make sure that you reflow fstrings {2 + 2:d}"
-    2+2:d
-}"
 f"This is a really long string, but just make sure that you reflow fstrings correctly {2 + 2:d}"
 
 f"{2+2=}"
 f"{2+2    =    }"
 f"{     2      +     2    =    }"
 
-f"""foo {
+f"""foo {datetime.datetime.now():%Y
-    datetime.datetime.now():%Y
 %m
 %d
 }"""
 
-f"{
+f"{X!r}"
-X
-!r
-}"
 
 raise ValueError(
-    "xxxxxxxxxxxIncorrect --line-ranges format, expect START-END, found"
+    f"xxxxxxxxxxxIncorrect --line-ranges format, expect START-END, found {lines_str!r}"
-    f" {lines_str!r}"
 )
 
 f"`escape` only permitted in {{'html', 'latex', 'latex-math'}}, \
@@ -270,8 +396,10 @@ x = f"\N{GREEK CAPITAL LETTER DELTA} \N{SNOWMAN} {x}"
 rf"\{{\}}"
 
 f"""
-    WITH {f'''
+    WITH {
-    {1}_cte AS ()'''}
+    f'''
+    {1}_cte AS ()'''
+}
 """
 
 value: str = f"""foo
@@ -284,21 +412,23 @@ log(
 )
 
 f"{1:{f'{2}'}}"
-f'{1:{f'{2}'}}'
+f"{1:{f'{2}'}}"
 f"{1:{2}d}"
 
 f'{{\\"kind\\":\\"ConfigMap\\",\\"metadata\\":{{\\"annotations\\":{{}},\\"name\\":\\"cluster-info\\",\\"namespace\\":\\"amazon-cloudwatch\\"}}}}'
 
-f"""{'''
+f"""{
-'''}"""
+    '''
+'''
+}"""
 
-f"{'\''}"
+f"{"'"}"
-f"{f'\''}"
+f"{f"'"}"
 
 f"{1}\{{"
 f"{2} foo \{{[\}}"
 f"\{3}"
-rf"\{"a"}"
+rf"\{'a'}"
 ```
 
 ## Black Output

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__return_annotation_brackets.py.snap

@@ -127,39 +127,7 @@ def foo(a,b) -> tuple[int, int, int,]:
      return 2 * a
  
  
-@@ -99,25 +107,31 @@
+@@ -117,7 +125,9 @@
-     return 2
- 
- 
--def foo() -> tuple[
--    loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
--    loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
--    loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
--]:
-+def foo() -> (
-+    tuple[
-+        loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
-+        loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
-+        loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
-+    ]
-+):
-     return 2
- 
- 
- # Magic trailing comma example
--def foo() -> tuple[
--    int,
--    int,
--    int,
--]:
-+def foo() -> (
-+    tuple[
-+        int,
-+        int,
-+        int,
-+    ]
-+):
-     return 2
  
  
  # Magic trailing comma example, with params
@@ -284,24 +252,20 @@ def foo() -> tuple[int, int, int]:
     return 2
 
 
-def foo() -> (
+def foo() -> tuple[
-    tuple[
     loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
     loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
     loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong,
-    ]
+]:
-):
     return 2
 
 
 # Magic trailing comma example
-def foo() -> (
+def foo() -> tuple[
-    tuple[
     int,
     int,
     int,
-    ]
+]:
-):
     return 2
 
 

crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__trailing_commas_in_leading_parts.py.snap

@@ -64,11 +64,9 @@ assert xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(
 -assert xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(
 -    xxxxxxxxx
 -).xxxxxxxxxxxxxxxxxx(), (
--    "xxx {xxxxxxxxx} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
++assert xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(xxxxxxxxx).xxxxxxxxxxxxxxxxxx(), (
--)
+     "xxx {xxxxxxxxx} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-+assert (
+ )
-+    xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(xxxxxxxxx).xxxxxxxxxxxxxxxxxx()
-+), "xxx {xxxxxxxxx} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 ```
 
 ## Ruff Output
@@ -117,9 +115,9 @@ assert (
 )
 
 # Regression test for https://github.com/psf/black/issues/3414.
-assert (
+assert xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(xxxxxxxxx).xxxxxxxxxxxxxxxxxx(), (
-    xxxxxxxxx.xxxxxxxxx.xxxxxxxxx(xxxxxxxxx).xxxxxxxxxxxxxxxxxx()
+    "xxx {xxxxxxxxx} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-), "xxx {xxxxxxxxx} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+)
 ```
 
 ## Black Output

crates/ruff_python_formatter/tests/snapshots/black_compatibility@miscellaneous__string_quotes.py.snap

@@ -71,7 +71,15 @@ f"\"{a}\"{'hello' * b}\"{c}\""
 ```diff
 --- Black
 +++ Ruff
-@@ -25,7 +25,12 @@
+@@ -18,14 +18,19 @@
+ quote"""
+ f"just a normal {f} string"
+ f"""This is a triple-quoted {f}-string"""
+-f'MOAR {" ".join([])}'
+ f"MOAR {' '.join([])}"
++f"MOAR {' '.join([])}"
+ r"raw string ftw"
+ r"Date d\'expiration:(.*)"
  r'Tricky "quote'
  r"Not-so-tricky \"quote"
  rf"{yay}"
@@ -85,6 +93,25 @@ f"\"{a}\"{'hello' * b}\"{c}\""
  re.compile(r'[\\"]')
  "x = ''; y = \"\""
  "x = '''; y = \"\""
+@@ -40,14 +45,14 @@
+ '\\""'
+ "\\''"
+ "Lots of \\\\\\\\'quotes'"
+-f'{y * " "} \'{z}\''
++f"{y * ' '} '{z}'"
+ f"{{y * \" \"}} '{z}'"
+-f'\'{z}\' {y * " "}'
++f"'{z}' {y * ' '}"
+ f"{y * x} '{z}'"
+ "'{z}' {y * \" \"}"
+ "{y * x} '{z}'"
+ 
+ # We must bail out if changing the quotes would introduce backslashes in f-string
+ # expressions. xref: https://github.com/psf/black/issues/2348
+-f"\"{b}\"{' ' * (long-len(b)+1)}: \"{sts}\",\n"
+-f"\"{a}\"{'hello' * b}\"{c}\""
++f'"{b}"{" " * (long - len(b) + 1)}: "{sts}",\n'
++f'"{a}"{"hello" * b}"{c}"'
 ```
 
 ## Ruff Output
@@ -110,7 +137,7 @@ f"\"{a}\"{'hello' * b}\"{c}\""
 quote"""
 f"just a normal {f} string"
 f"""This is a triple-quoted {f}-string"""
-f'MOAR {" ".join([])}'
+f"MOAR {' '.join([])}"
 f"MOAR {' '.join([])}"
 r"raw string ftw"
 r"Date d\'expiration:(.*)"
@@ -137,17 +164,17 @@ re.compile(r'[\\"]')
 '\\""'
 "\\''"
 "Lots of \\\\\\\\'quotes'"
-f'{y * " "} \'{z}\''
+f"{y * ' '} '{z}'"
 f"{{y * \" \"}} '{z}'"
-f'\'{z}\' {y * " "}'
+f"'{z}' {y * ' '}"
 f"{y * x} '{z}'"
 "'{z}' {y * \" \"}"
 "{y * x} '{z}'"
 
 # We must bail out if changing the quotes would introduce backslashes in f-string
 # expressions. xref: https://github.com/psf/black/issues/2348
-f"\"{b}\"{' ' * (long-len(b)+1)}: \"{sts}\",\n"
+f'"{b}"{" " * (long - len(b) + 1)}: "{sts}",\n'
-f"\"{a}\"{'hello' * b}\"{c}\""
+f'"{a}"{"hello" * b}"{c}"'
 ```
 
 ## Black Output

crates/ruff_python_formatter/tests/snapshots/format@docstring_code_examples_dynamic_line_width.py.snap

@@ -616,7 +616,9 @@ def length_doctest():
         Integer length of the list of numbers.
 
     Example:
-        >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+        >>> length(
+        ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+        ... )
         20
     """
 
@@ -631,7 +633,9 @@ def length_doctest_underindent():
             Integer length of the list of numbers.
 
     Example:
-        >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+        >>> length(
+        ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+        ... )
         20
     """
 
@@ -649,7 +653,9 @@ def length_markdown():
     Example:
 
         ```
-        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+        length(
+            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+        )
         ```
     """
 
@@ -659,7 +665,9 @@ def length_rst():
     """
     Do cool stuff::
 
-        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+        length(
+            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+        )
     """
     pass
 
@@ -670,7 +678,9 @@ def length_rst_in_section():
     Examples:
         Do cool stuff::
 
-            length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+            length(
+                [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+            )
     """
     pass
 ```
@@ -695,11 +705,13 @@ def length_rst_in_section():
          """
  
  
-@@ -300,7 +302,28 @@
+@@ -300,9 +302,28 @@
          Integer length of the list of numbers.
  
      Example:
--        >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-        >>> length(
+-        ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-        ... )
 +        >>> length([
 +        ...     1,
 +        ...     2,
@@ -725,11 +737,13 @@ def length_rst_in_section():
          20
      """
  
-@@ -315,7 +338,28 @@
+@@ -317,9 +338,28 @@
              Integer length of the list of numbers.
  
      Example:
--        >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-        >>> length(
+-        ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-        ... )
 +        >>> length([
 +        ...     1,
 +        ...     2,
@@ -755,11 +769,13 @@ def length_rst_in_section():
          20
      """
  
-@@ -333,7 +377,29 @@
+@@ -337,9 +377,29 @@
      Example:
  
          ```
--        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-        length(
+-            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-        )
 +        length([
 +            1,
 +            2,
@@ -786,11 +802,13 @@ def length_rst_in_section():
          ```
      """
  
-@@ -343,7 +409,29 @@
+@@ -349,9 +409,29 @@
      """
      Do cool stuff::
  
--        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-        length(
+-            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-        )
 +        length([
 +            1,
 +            2,
@@ -817,11 +835,13 @@ def length_rst_in_section():
      """
      pass
  
-@@ -354,6 +442,27 @@
+@@ -362,8 +442,27 @@
      Examples:
          Do cool stuff::
  
--            length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-            length(
+-                [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-            )
 +            length([
 +                1,
 +                2,
@@ -1157,7 +1177,9 @@ def length_doctest():
       Integer length of the list of numbers.
 
   Example:
-      >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+      >>> length(
+      ...   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+      ... )
       20
   """
 
@@ -1172,7 +1194,9 @@ def length_doctest_underindent():
           Integer length of the list of numbers.
 
   Example:
-      >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+      >>> length(
+      ...   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+      ... )
       20
   """
 
@@ -1190,7 +1214,9 @@ def length_markdown():
   Example:
 
       ```
-      length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+      length(
+        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+      )
       ```
   """
 
@@ -1200,7 +1226,9 @@ def length_rst():
   """
   Do cool stuff::
 
-      length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+      length(
+        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+      )
   """
   pass
 
@@ -1211,7 +1239,9 @@ def length_rst_in_section():
   Examples:
       Do cool stuff::
 
-          length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+          length(
+            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+          )
   """
   pass
 ```
@@ -1221,11 +1251,13 @@ def length_rst_in_section():
 ```diff
 --- Stable
 +++ Preview
-@@ -290,7 +290,28 @@
+@@ -290,9 +290,28 @@
        Integer length of the list of numbers.
  
    Example:
--      >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-      >>> length(
+-      ...   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-      ... )
 +      >>> length([
 +      ...   1,
 +      ...   2,
@@ -1251,11 +1283,13 @@ def length_rst_in_section():
        20
    """
  
-@@ -305,7 +326,28 @@
+@@ -307,9 +326,28 @@
            Integer length of the list of numbers.
  
    Example:
--      >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-      >>> length(
+-      ...   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-      ... )
 +      >>> length([
 +      ...   1,
 +      ...   2,
@@ -1281,11 +1315,13 @@ def length_rst_in_section():
        20
    """
  
-@@ -323,7 +365,29 @@
+@@ -327,9 +365,29 @@
    Example:
  
        ```
--      length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-      length(
+-        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-      )
 +      length([
 +        1,
 +        2,
@@ -1312,11 +1348,13 @@ def length_rst_in_section():
        ```
    """
  
-@@ -333,7 +397,29 @@
+@@ -339,9 +397,29 @@
    """
    Do cool stuff::
  
--      length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-      length(
+-        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-      )
 +      length([
 +        1,
 +        2,
@@ -1343,11 +1381,13 @@ def length_rst_in_section():
    """
    pass
  
-@@ -344,6 +430,27 @@
+@@ -352,8 +430,27 @@
    Examples:
        Do cool stuff::
  
--          length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-          length(
+-            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-          )
 +          length([
 +            1,
 +            2,
@@ -1693,7 +1733,9 @@ def length_doctest():
 	    Integer length of the list of numbers.
 
 	Example:
-	    >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+	    >>> length(
+	    ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+	    ... )
 	    20
 	"""
 
@@ -1708,7 +1750,9 @@ def length_doctest_underindent():
 	        Integer length of the list of numbers.
 
 	Example:
-	    >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+	    >>> length(
+	    ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+	    ... )
 	    20
 	"""
 
@@ -1726,7 +1770,9 @@ def length_markdown():
 	Example:
 
 	    ```
-	    length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+	    length(
+	        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+	    )
 	    ```
 	"""
 
@@ -1736,7 +1782,9 @@ def length_rst():
 	"""
 	Do cool stuff::
 
-	    length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+	    length(
+	        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+	    )
 	"""
 	pass
 
@@ -1747,7 +1795,9 @@ def length_rst_in_section():
 	Examples:
 	    Do cool stuff::
 
-	        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+	        length(
+	            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+	        )
 	"""
 	pass
 ```
@@ -1772,11 +1822,13 @@ def length_rst_in_section():
  		"""
  
  
-@@ -300,7 +302,28 @@
+@@ -300,9 +302,28 @@
  	    Integer length of the list of numbers.
  
  	Example:
--	    >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-	    >>> length(
+-	    ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-	    ... )
 +	    >>> length([
 +	    ...     1,
 +	    ...     2,
@@ -1802,11 +1854,13 @@ def length_rst_in_section():
  	    20
  	"""
  
-@@ -315,7 +338,28 @@
+@@ -317,9 +338,28 @@
  	        Integer length of the list of numbers.
  
  	Example:
--	    >>> length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-	    >>> length(
+-	    ...     [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-	    ... )
 +	    >>> length([
 +	    ...     1,
 +	    ...     2,
@@ -1832,11 +1886,13 @@ def length_rst_in_section():
  	    20
  	"""
  
-@@ -333,7 +377,29 @@
+@@ -337,9 +377,29 @@
  	Example:
  
  	    ```
--	    length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-	    length(
+-	        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-	    )
 +	    length([
 +	        1,
 +	        2,
@@ -1863,11 +1919,13 @@ def length_rst_in_section():
  	    ```
  	"""
  
-@@ -343,7 +409,29 @@
+@@ -349,9 +409,29 @@
  	"""
  	Do cool stuff::
  
--	    length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])
+-	    length(
+-	        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
+-	    )
 +	    length([
 +	        1,
 +	        2,
@@ -1894,11 +1952,13 @@ def length_rst_in_section():
  	"""
  	pass
  
-@@ -354,6 +442,27 @@
+@@ -362,8 +442,27 @@
  	Examples:
  	    Do cool stuff::
  
--	        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-	        length(
+-	            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+-	        )
 +	        length([
 +	            1,
 +	            2,
@@ -2822,7 +2882,30 @@ def length_rst_in_section():
 	Examples:
 	    Do cool stuff::
 
-	        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+	        length(
+	                [
+	                        1,
+	                        2,
+	                        3,
+	                        4,
+	                        5,
+	                        6,
+	                        7,
+	                        8,
+	                        9,
+	                        10,
+	                        11,
+	                        12,
+	                        13,
+	                        14,
+	                        15,
+	                        16,
+	                        17,
+	                        18,
+	                        19,
+	                        20,
+	                ]
+	        )
 	"""
 	pass
 ```
@@ -3063,11 +3146,34 @@ def length_rst_in_section():
  	"""
  	pass
  
-@@ -878,6 +872,27 @@
+@@ -878,29 +872,27 @@
  	Examples:
  	    Do cool stuff::
  
--	        length([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])
+-	        length(
+-	                [
+-	                        1,
+-	                        2,
+-	                        3,
+-	                        4,
+-	                        5,
+-	                        6,
+-	                        7,
+-	                        8,
+-	                        9,
+-	                        10,
+-	                        11,
+-	                        12,
+-	                        13,
+-	                        14,
+-	                        15,
+-	                        16,
+-	                        17,
+-	                        18,
+-	                        19,
+-	                        20,
+-	                ]
+-	        )
 +	        length([
 +	                1,
 +	                2,

crates/ruff_python_formatter/tests/snapshots/format@expression__binary.py.snap

@@ -911,52 +911,20 @@ if True:
                 )
 
 # This f-string should be flattened
-xxxxxxxxxxxxxxxx = f"aaaaaaaaaaaaaaaaaaaaa {
+xxxxxxxxxxxxxxxx = f"aaaaaaaaaaaaaaaaaaaaa {expression} bbbbbbbbbbbbbbbbbbbbbbbb" + (
-    expression } bbbbbbbbbbbbbbbbbbbbbbbb" + (yyyyyyyyyyyyyy + zzzzzzzzzzz)
+    yyyyyyyyyyyyyy + zzzzzzzzzzz
+)
 
 # This is not a multiline f-string, but the expression is too long so it should be
 # wrapped in parentheses.
+(
     f"hellooooooooooooooooooooooo \
-        worlddddddddddddddddddddddddddddddddd" + (
+        worlddddddddddddddddddddddddddddddddd"
-    aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb
+    + (aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb)
 )
-aaaaaaaaaaa = f"hellooooooooooooooooooooooo \
+aaaaaaaaaaa = (
-        worlddddddddddddddddddddddddddddddddd" + (
+    f"hellooooooooooooooooooooooo \
-    aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb
+        worlddddddddddddddddddddddddddddddddd"
-)
+    + (aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb)
-```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -468,16 +468,19 @@
-                 )
- 
- # This f-string should be flattened
--xxxxxxxxxxxxxxxx = f"aaaaaaaaaaaaaaaaaaaaa {
--    expression } bbbbbbbbbbbbbbbbbbbbbbbb" + (yyyyyyyyyyyyyy + zzzzzzzzzzz)
-+xxxxxxxxxxxxxxxx = f"aaaaaaaaaaaaaaaaaaaaa {expression} bbbbbbbbbbbbbbbbbbbbbbbb" + (
-+    yyyyyyyyyyyyyy + zzzzzzzzzzz
-+)
- 
- # This is not a multiline f-string, but the expression is too long so it should be
- # wrapped in parentheses.
--f"hellooooooooooooooooooooooo \
--        worlddddddddddddddddddddddddddddddddd" + (
--    aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb
-+(
-+    f"hellooooooooooooooooooooooo \
-+        worlddddddddddddddddddddddddddddddddd"
-+    + (aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb)
- )
--aaaaaaaaaaa = f"hellooooooooooooooooooooooo \
--        worlddddddddddddddddddddddddddddddddd" + (
--    aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb
-+aaaaaaaaaaa = (
-+    f"hellooooooooooooooooooooooo \
-+        worlddddddddddddddddddddddddddddddddd"
-+    + (aaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbb)
 )
 ```

crates/ruff_python_formatter/tests/snapshots/format@expression__binary_implicit_string.py.snap

@@ -399,27 +399,9 @@ c = (
     "dddddddddddddddddddddddddd" % aaaaaaaaaaaa + x
 )
 
-"a" "b" "c" + "d" "e" + "f" "g" + "h" "i" "j"
+"abc" + "de" + "fg" + "hij"
 
 
 class EC2REPATH:
-    f.write("Pathway name" + "\t" "Database Identifier" + "\t" "Source database" + "\n")
+    f.write("Pathway name" + "\tDatabase Identifier" + "\tSource database" + "\n")
-```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -197,8 +197,8 @@
-     "dddddddddddddddddddddddddd" % aaaaaaaaaaaa + x
- )
- 
--"a" "b" "c" + "d" "e" + "f" "g" + "h" "i" "j"
-+"abc" + "de" + "fg" + "hij"
- 
- 
- class EC2REPATH:
--    f.write("Pathway name" + "\t" "Database Identifier" + "\t" "Source database" + "\n")
-+    f.write("Pathway name" + "\tDatabase Identifier" + "\tSource database" + "\n")
 ```

crates/ruff_python_formatter/tests/snapshots/format@expression__bytes.py.snap

@@ -211,9 +211,9 @@ String \"\"\"
 
 # String continuation
 
-b"Let's" b"start" b"with" b"a" b"simple" b"example"
+b"Let'sstartwithasimpleexample"
 
-b"Let's" b"start" b"with" b"a" b"simple" b"example" b"now repeat after me:" b"I am confident" b"I am confident" b"I am confident" b"I am confident" b"I am confident"
+b"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
 
 (
     b"Let's"
@@ -280,34 +280,7 @@ test_particular = [
 ]
 
 # Parenthesized string continuation with messed up indentation
-{"key": ([], b"a" b"b" b"c")}
+{"key": ([], b"abc")}
-
-b"Unicode Escape sequence don't apply to bytes: \N{0x} \u{ABCD} \U{ABCDEFGH}"
-```
-
-
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -63,9 +63,9 @@
- 
- # String continuation
- 
--b"Let's" b"start" b"with" b"a" b"simple" b"example"
-+b"Let'sstartwithasimpleexample"
- 
--b"Let's" b"start" b"with" b"a" b"simple" b"example" b"now repeat after me:" b"I am confident" b"I am confident" b"I am confident" b"I am confident" b"I am confident"
-+b"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
- 
- (
-     b"Let's"
-@@ -132,6 +132,6 @@
- ]
- 
- # Parenthesized string continuation with messed up indentation
--{"key": ([], b"a" b"b" b"c")}
-+{"key": ([], b"abc")}
 
 b"Unicode Escape sequence don't apply to bytes: \N{0x} \u{ABCD} \U{ABCDEFGH}"
 ```
@@ -394,9 +367,9 @@ String \"\"\"
 
 # String continuation
 
-b"Let's" b'start' b'with' b'a' b'simple' b'example'
+b"Let'sstartwithasimpleexample"
 
-b"Let's" b'start' b'with' b'a' b'simple' b'example' b'now repeat after me:' b'I am confident' b'I am confident' b'I am confident' b'I am confident' b'I am confident'
+b"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
 
 (
     b"Let's"
@@ -463,34 +436,7 @@ test_particular = [
 ]
 
 # Parenthesized string continuation with messed up indentation
-{'key': ([], b'a' b'b' b'c')}
+{'key': ([], b'abc')}
-
-b"Unicode Escape sequence don't apply to bytes: \N{0x} \u{ABCD} \U{ABCDEFGH}"
-```
-
-
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -63,9 +63,9 @@
- 
- # String continuation
- 
--b"Let's" b'start' b'with' b'a' b'simple' b'example'
-+b"Let'sstartwithasimpleexample"
- 
--b"Let's" b'start' b'with' b'a' b'simple' b'example' b'now repeat after me:' b'I am confident' b'I am confident' b'I am confident' b'I am confident' b'I am confident'
-+b"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
- 
- (
-     b"Let's"
-@@ -132,6 +132,6 @@
- ]
- 
- # Parenthesized string continuation with messed up indentation
--{'key': ([], b'a' b'b' b'c')}
-+{'key': ([], b'abc')}
 
 b"Unicode Escape sequence don't apply to bytes: \N{0x} \u{ABCD} \U{ABCDEFGH}"
 ```

crates/ruff_python_formatter/tests/snapshots/format@expression__join_implicit_concatenated_string.py.snap

@@ -355,22 +355,7 @@ f"aaaaaaaaaaaaaaaa \
 )
 ```
 
-## Outputs
+## Output
-### Output 1
-```
-indent-style               = space
-line-width                 = 88
-indent-width               = 4
-quote-style                = Double
-line-ending                = LineFeed
-magic-trailing-comma       = Respect
-docstring-code             = Disabled
-docstring-code-line-width  = "dynamic"
-preview                    = Enabled
-target_version             = Py39
-source_type                = Python
-```
-
 ```python
 "aaaaaaaaabbbbbbbbbbbbbbbbbbbb"  # Join
 
@@ -616,12 +601,9 @@ assert (
 ##############################################################################
 # Use can_omit_optional_parentheses layout to avoid an instability where the formatter
 # picks the can_omit_optional_parentheses layout when the strings are joined.
-if f"implicitconcatenatedstring" + f"implicitconcadddddddddddedring" * len([
+if f"implicitconcatenatedstring" + f"implicitconcadddddddddddedring" * len(
-    aaaaaa,
+    [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
-    bbbbbbbbbbbbbbbb,
+):
-    cccccccccccccccccc,
-    ddddddddddddddddddddddddddd,
-]):
     pass
 
 # Keep parenthesizing multiline - implicit concatenated strings
@@ -792,3 +774,26 @@ f"aaaaaaaaaaaaaaaa \
             ddddddddddddddddddd"  # comment 4
 )
 ```
+
+
+## Preview changes
+```diff
+--- Stable
++++ Preview
+@@ -242,9 +242,12 @@
+ ##############################################################################
+ # Use can_omit_optional_parentheses layout to avoid an instability where the formatter
+ # picks the can_omit_optional_parentheses layout when the strings are joined.
+-if f"implicitconcatenatedstring" + f"implicitconcadddddddddddedring" * len(
+-    [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
+-):
++if f"implicitconcatenatedstring" + f"implicitconcadddddddddddedring" * len([
++    aaaaaa,
++    bbbbbbbbbbbbbbbb,
++    cccccccccccccccccc,
++    ddddddddddddddddddddddddddd,
++]):
+     pass
+ 
+ # Keep parenthesizing multiline - implicit concatenated strings
+```

crates/ruff_python_formatter/tests/snapshots/format@expression__join_implicit_concatenated_string_assignment.py.snap

@@ -1,7 +1,6 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
 input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/join_implicit_concatenated_string_assignment.py
-snapshot_kind: text
 ---
 ## Input
 ```python
@@ -300,22 +299,7 @@ aaaaa[aaaaaaaaaaa] = (
 )
 ```
 
-## Outputs
+## Output
-### Output 1
-```
-indent-style               = space
-line-width                 = 88
-indent-width               = 4
-quote-style                = Double
-line-ending                = LineFeed
-magic-trailing-comma       = Respect
-docstring-code             = Disabled
-docstring-code-line-width  = "dynamic"
-preview                    = Enabled
-target_version             = Py39
-source_type                = Python
-```
-
 ```python
 ## Implicit concatenated strings with a trailing comment but a non splittable target.
 

crates/ruff_python_formatter/tests/snapshots/format@expression__join_implicit_concatenated_string_preserve.py.snap

@@ -1,7 +1,6 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
 input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/join_implicit_concatenated_string_preserve.py
-snapshot_kind: text
 ---
 ## Input
 ```python
@@ -31,7 +30,7 @@ line-ending                = LineFeed
 magic-trailing-comma       = Respect
 docstring-code             = Disabled
 docstring-code-line-width  = "dynamic"
-preview                    = Enabled
+preview                    = Disabled
 target_version             = Py39
 source_type                = Python
 ```
@@ -63,7 +62,7 @@ line-ending                = LineFeed
 magic-trailing-comma       = Respect
 docstring-code             = Disabled
 docstring-code-line-width  = "dynamic"
-preview                    = Enabled
+preview                    = Disabled
 target_version             = Py312
 source_type                = Python
 ```

crates/ruff_python_formatter/tests/snapshots/format@expression__list_comp.py.snap

@@ -323,24 +323,20 @@ aaaaaaaaaaaaaaaaaaaaa = [
 # Leading expression comments:
 y = [
     a
-    for
+    for (
-    (
         # comment
         a
-    ) in
+    ) in (
-    (
         # comment
         x
     )
-    if
+    if (
-    (
         # asdasd
         "askldaklsdnmklasmdlkasmdlkasmdlkasmdasd"
         != "as,mdnaskldmlkasdmlaksdmlkasdlkasdm"
         and "zxcm,.nzxclm,zxnckmnzxckmnzxczxc" != "zxcasdasdlmnasdlknaslkdnmlaskdm"
     )
-    if
+    if (
-    (
         # comment
         x
     )
@@ -383,39 +379,3 @@ y = [
     x
 ]
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -142,24 +142,20 @@
- # Leading expression comments:
- y = [
-     a
--    for
--    (
-+    for (
-         # comment
-         a
--    ) in
--    (
-+    ) in (
-         # comment
-         x
-     )
--    if
--    (
-+    if (
-         # asdasd
-         "askldaklsdnmklasmdlkasmdlkasmdlkasmdasd"
-         != "as,mdnaskldmlkasdmlaksdmlkasdlkasdm"
-         and "zxcm,.nzxclm,zxnckmnzxckmnzxczxc" != "zxcasdasdlmnasdlknaslkdnmlaskdm"
-     )
--    if
--    (
-+    if (
-         # comment
-         x
-     )
-```

crates/ruff_python_formatter/tests/snapshots/format@expression__string.py.snap

@@ -310,9 +310,9 @@ String \"\"\"
 
 # String continuation
 
-"Let's" "start" "with" "a" "simple" "example"
+"Let'sstartwithasimpleexample"
 
-"Let's" "start" "with" "a" "simple" "example" "now repeat after me:" "I am confident" "I am confident" "I am confident" "I am confident" "I am confident"
+"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
 
 (
     "Let's"
@@ -379,7 +379,7 @@ test_particular = [
 ]
 
 # Parenthesized string continuation with messed up indentation
-{"key": ([], "a" "b" "c")}
+{"key": ([], "abc")}
 
 
 # Regression test for https://github.com/astral-sh/ruff/issues/5893
@@ -412,19 +412,31 @@ a = """\\\x1f"""
 # In preview, don't collapse implicit concatenated strings that can't be joined into a single string
 # and that are multiline in the source.
 
-(r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb")
+(
-
+    r"aaaaaaaaa"
-(r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb" "cccccccccccccccccccccc")
+    r"bbbbbbbbbbbbbbbbbbbb"
-
+)
-("""aaaaaaaaa""" """bbbbbbbbbbbbbbbbbbbb""")
 
 (
-    f"""aaaa{
+    r"aaaaaaaaa"
-    10}aaaaa"""
+    r"bbbbbbbbbbbbbbbbbbbb"
+    "cccccccccccccccccccccc"
+)
+
+(
+    """aaaaaaaaa"""
+    """bbbbbbbbbbbbbbbbbbbb"""
+)
+
+(
+    f"""aaaa{10}aaaaa"""
     rf"""bbbbbbbbbbbbbbbbbbbb"""
 )
 
-if (r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb") + ["aaaaaaaaaa", "bbbbbbbbbbbbbbbb"]:
+if (
+    r"aaaaaaaaa"
+    r"bbbbbbbbbbbbbbbbbbbb"
+) + ["aaaaaaaaaa", "bbbbbbbbbbbbbbbb"]:
     ...
 
 
@@ -433,24 +445,19 @@ if (r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb") + ["aaaaaaaaaa", "bbbbbbbbbbbbbbbb"]:
 
 r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb"
 
-(
+(f"aaaa{10}aaaaa" rf"bbbbbbbbbbbbbbbbbbbb")
-    f"aaaa{
-    10}aaaaa"
-    rf"bbbbbbbbbbbbbbbbbbbb"
-)
 
 (r"""aaaaaaaaa""" r"""bbbbbbbbbbbbbbbbbbbb""")
 
-(
+(f"""aaaa{10}aaaaa""" rf"""bbbbbbbbbbbbbbbbbbbb""")
-    f"""aaaa{
-    10}aaaaa"""
-    rf"""bbbbbbbbbbbbbbbbbbbb"""
-)
 
 
 # In docstring positions
 def docstring():
-    r"aaaaaaaaa" "bbbbbbbbbbbbbbbbbbbb"
+    (
+        r"aaaaaaaaa"
+        "bbbbbbbbbbbbbbbbbbbb"
+    )
 
 
 def docstring_flat():
@@ -465,103 +472,6 @@ def docstring_flat_overlong():
 ```
 
 
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -70,9 +70,9 @@
- 
- # String continuation
- 
--"Let's" "start" "with" "a" "simple" "example"
-+"Let'sstartwithasimpleexample"
- 
--"Let's" "start" "with" "a" "simple" "example" "now repeat after me:" "I am confident" "I am confident" "I am confident" "I am confident" "I am confident"
-+"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
- 
- (
-     "Let's"
-@@ -139,7 +139,7 @@
- ]
- 
- # Parenthesized string continuation with messed up indentation
--{"key": ([], "a" "b" "c")}
-+{"key": ([], "abc")}
- 
- 
- # Regression test for https://github.com/astral-sh/ruff/issues/5893
-@@ -172,19 +172,31 @@
- # In preview, don't collapse implicit concatenated strings that can't be joined into a single string
- # and that are multiline in the source.
- 
--(r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb")
-+(
-+    r"aaaaaaaaa"
-+    r"bbbbbbbbbbbbbbbbbbbb"
-+)
- 
--(r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb" "cccccccccccccccccccccc")
-+(
-+    r"aaaaaaaaa"
-+    r"bbbbbbbbbbbbbbbbbbbb"
-+    "cccccccccccccccccccccc"
-+)
- 
--("""aaaaaaaaa""" """bbbbbbbbbbbbbbbbbbbb""")
-+(
-+    """aaaaaaaaa"""
-+    """bbbbbbbbbbbbbbbbbbbb"""
-+)
- 
- (
--    f"""aaaa{
--    10}aaaaa"""
-+    f"""aaaa{10}aaaaa"""
-     rf"""bbbbbbbbbbbbbbbbbbbb"""
- )
- 
--if (r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb") + ["aaaaaaaaaa", "bbbbbbbbbbbbbbbb"]:
-+if (
-+    r"aaaaaaaaa"
-+    r"bbbbbbbbbbbbbbbbbbbb"
-+) + ["aaaaaaaaaa", "bbbbbbbbbbbbbbbb"]:
-     ...
- 
- 
-@@ -193,24 +205,19 @@
- 
- r"aaaaaaaaa" r"bbbbbbbbbbbbbbbbbbbb"
- 
--(
--    f"aaaa{
--    10}aaaaa"
--    rf"bbbbbbbbbbbbbbbbbbbb"
--)
-+(f"aaaa{10}aaaaa" rf"bbbbbbbbbbbbbbbbbbbb")
- 
- (r"""aaaaaaaaa""" r"""bbbbbbbbbbbbbbbbbbbb""")
- 
--(
--    f"""aaaa{
--    10}aaaaa"""
--    rf"""bbbbbbbbbbbbbbbbbbbb"""
--)
-+(f"""aaaa{10}aaaaa""" rf"""bbbbbbbbbbbbbbbbbbbb""")
- 
- 
- # In docstring positions
- def docstring():
--    r"aaaaaaaaa" "bbbbbbbbbbbbbbbbbbbb"
-+    (
-+        r"aaaaaaaaa"
-+        "bbbbbbbbbbbbbbbbbbbb"
-+    )
- 
- 
- def docstring_flat():
-```
-
-
 ### Output 2
 ```
 indent-style               = space
@@ -650,9 +560,9 @@ String \"\"\"
 
 # String continuation
 
-"Let's" 'start' 'with' 'a' 'simple' 'example'
+"Let'sstartwithasimpleexample"
 
-"Let's" 'start' 'with' 'a' 'simple' 'example' 'now repeat after me:' 'I am confident' 'I am confident' 'I am confident' 'I am confident' 'I am confident'
+"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
 
 (
     "Let's"
@@ -719,7 +629,7 @@ test_particular = [
 ]
 
 # Parenthesized string continuation with messed up indentation
-{'key': ([], 'a' 'b' 'c')}
+{'key': ([], 'abc')}
 
 
 # Regression test for https://github.com/astral-sh/ruff/issues/5893
@@ -752,19 +662,31 @@ a = """\\\x1f"""
 # In preview, don't collapse implicit concatenated strings that can't be joined into a single string
 # and that are multiline in the source.
 
-(r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb')
+(
-
+    r'aaaaaaaaa'
-(r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb' 'cccccccccccccccccccccc')
+    r'bbbbbbbbbbbbbbbbbbbb'
-
+)
-("""aaaaaaaaa""" """bbbbbbbbbbbbbbbbbbbb""")
 
 (
-    f"""aaaa{
+    r'aaaaaaaaa'
-    10}aaaaa"""
+    r'bbbbbbbbbbbbbbbbbbbb'
+    'cccccccccccccccccccccc'
+)
+
+(
+    """aaaaaaaaa"""
+    """bbbbbbbbbbbbbbbbbbbb"""
+)
+
+(
+    f"""aaaa{10}aaaaa"""
     rf"""bbbbbbbbbbbbbbbbbbbb"""
 )
 
-if (r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb') + ['aaaaaaaaaa', 'bbbbbbbbbbbbbbbb']:
+if (
+    r'aaaaaaaaa'
+    r'bbbbbbbbbbbbbbbbbbbb'
+) + ['aaaaaaaaaa', 'bbbbbbbbbbbbbbbb']:
     ...
 
 
@@ -773,24 +695,19 @@ if (r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb') + ['aaaaaaaaaa', 'bbbbbbbbbbbbbbbb']:
 
 r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb'
 
-(
+(f'aaaa{10}aaaaa' rf'bbbbbbbbbbbbbbbbbbbb')
-    f'aaaa{
-    10}aaaaa'
-    rf'bbbbbbbbbbbbbbbbbbbb'
-)
 
 (r"""aaaaaaaaa""" r"""bbbbbbbbbbbbbbbbbbbb""")
 
-(
+(f"""aaaa{10}aaaaa""" rf"""bbbbbbbbbbbbbbbbbbbb""")
-    f"""aaaa{
-    10}aaaaa"""
-    rf"""bbbbbbbbbbbbbbbbbbbb"""
-)
 
 
 # In docstring positions
 def docstring():
-    r'aaaaaaaaa' 'bbbbbbbbbbbbbbbbbbbb'
+    (
+        r'aaaaaaaaa'
+        'bbbbbbbbbbbbbbbbbbbb'
+    )
 
 
 def docstring_flat():
@@ -803,100 +720,3 @@ def docstring_flat_overlong():
         r'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb'
     )
 ```
-
-
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -70,9 +70,9 @@
- 
- # String continuation
- 
--"Let's" 'start' 'with' 'a' 'simple' 'example'
-+"Let'sstartwithasimpleexample"
- 
--"Let's" 'start' 'with' 'a' 'simple' 'example' 'now repeat after me:' 'I am confident' 'I am confident' 'I am confident' 'I am confident' 'I am confident'
-+"Let'sstartwithasimpleexamplenow repeat after me:I am confidentI am confidentI am confidentI am confidentI am confident"
- 
- (
-     "Let's"
-@@ -139,7 +139,7 @@
- ]
- 
- # Parenthesized string continuation with messed up indentation
--{'key': ([], 'a' 'b' 'c')}
-+{'key': ([], 'abc')}
- 
- 
- # Regression test for https://github.com/astral-sh/ruff/issues/5893
-@@ -172,19 +172,31 @@
- # In preview, don't collapse implicit concatenated strings that can't be joined into a single string
- # and that are multiline in the source.
- 
--(r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb')
-+(
-+    r'aaaaaaaaa'
-+    r'bbbbbbbbbbbbbbbbbbbb'
-+)
- 
--(r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb' 'cccccccccccccccccccccc')
-+(
-+    r'aaaaaaaaa'
-+    r'bbbbbbbbbbbbbbbbbbbb'
-+    'cccccccccccccccccccccc'
-+)
- 
--("""aaaaaaaaa""" """bbbbbbbbbbbbbbbbbbbb""")
-+(
-+    """aaaaaaaaa"""
-+    """bbbbbbbbbbbbbbbbbbbb"""
-+)
- 
- (
--    f"""aaaa{
--    10}aaaaa"""
-+    f"""aaaa{10}aaaaa"""
-     rf"""bbbbbbbbbbbbbbbbbbbb"""
- )
- 
--if (r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb') + ['aaaaaaaaaa', 'bbbbbbbbbbbbbbbb']:
-+if (
-+    r'aaaaaaaaa'
-+    r'bbbbbbbbbbbbbbbbbbbb'
-+) + ['aaaaaaaaaa', 'bbbbbbbbbbbbbbbb']:
-     ...
- 
- 
-@@ -193,24 +205,19 @@
- 
- r'aaaaaaaaa' r'bbbbbbbbbbbbbbbbbbbb'
- 
--(
--    f'aaaa{
--    10}aaaaa'
--    rf'bbbbbbbbbbbbbbbbbbbb'
--)
-+(f'aaaa{10}aaaaa' rf'bbbbbbbbbbbbbbbbbbbb')
- 
- (r"""aaaaaaaaa""" r"""bbbbbbbbbbbbbbbbbbbb""")
- 
--(
--    f"""aaaa{
--    10}aaaaa"""
--    rf"""bbbbbbbbbbbbbbbbbbbb"""
--)
-+(f"""aaaa{10}aaaaa""" rf"""bbbbbbbbbbbbbbbbbbbb""")
- 
- 
- # In docstring positions
- def docstring():
--    r'aaaaaaaaa' 'bbbbbbbbbbbbbbbbbbbb'
-+    (
-+        r'aaaaaaaaa'
-+        'bbbbbbbbbbbbbbbbbbbb'
-+    )
- 
- 
- def docstring_flat():
-```

crates/ruff_python_formatter/tests/snapshots/format@expression__yield.py.snap

@@ -210,7 +210,7 @@ yield (
     )
 )
 
-yield "Cache key will cause errors if used with memcached: %r " "(longer than %s)" % (
+yield "Cache key will cause errors if used with memcached: %r (longer than %s)" % (
     key,
     MEMCACHE_MAX_KEY_LENGTH,
 )
@@ -228,8 +228,7 @@ yield (
     "Django to create, modify, and delete the table"
 )
 yield (
-    "# Feel free to rename the models, but don't rename db_table values or "
+    "# Feel free to rename the models, but don't rename db_table values or field names."
-    "field names."
 )
 
 yield (
@@ -241,8 +240,7 @@ yield (
     "Django to create, modify, and delete the table"
 )
 yield (
-    "# Feel free to rename the models, but don't rename db_table values or "
+    "# Feel free to rename the models, but don't rename db_table values or field names."
-    "field names."
 )
 
 # Regression test for: https://github.com/astral-sh/ruff/issues/7420
@@ -278,39 +276,3 @@ result = yield (
 
 print((yield x))
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -78,7 +78,7 @@
-     )
- )
- 
--yield "Cache key will cause errors if used with memcached: %r " "(longer than %s)" % (
-+yield "Cache key will cause errors if used with memcached: %r (longer than %s)" % (
-     key,
-     MEMCACHE_MAX_KEY_LENGTH,
- )
-@@ -96,8 +96,7 @@
-     "Django to create, modify, and delete the table"
- )
- yield (
--    "# Feel free to rename the models, but don't rename db_table values or "
--    "field names."
-+    "# Feel free to rename the models, but don't rename db_table values or field names."
- )
- 
- yield (
-@@ -109,8 +108,7 @@
-     "Django to create, modify, and delete the table"
- )
- yield (
--    "# Feel free to rename the models, but don't rename db_table values or "
--    "field names."
-+    "# Feel free to rename the models, but don't rename db_table values or field names."
- )
- 
- # Regression test for: https://github.com/astral-sh/ruff/issues/7420
-```

crates/ruff_python_formatter/tests/snapshots/format@pattern__pattern_maybe_parenthesize.py.snap

@@ -304,31 +304,43 @@ match x:
 # Patterns that use BestFit should be parenthesized if they exceed the configured line width
 # but fit within parentheses.
 match x:
-    case "averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPar":
+    case (
+        "averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPar"
+    ):
         pass
 
 
 match x:
-    case b"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa":
+    case (
+        b"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa"
+    ):
         pass
 
 match x:
-    case f"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa":
+    case (
+        f"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa"
+    ):
         pass
 
 
 match x:
-    case 5444444444444444444444444444444444444444444444444444444444444444444444444444444j:
+    case (
+        5444444444444444444444444444444444444444444444444444444444444444444444444444444j
+    ):
         pass
 
 
 match x:
-    case 5444444444444444444444444444444444444444444444444444444444444444444444444444444:
+    case (
+        5444444444444444444444444444444444444444444444444444444444444444444444444444444
+    ):
         pass
 
 
 match x:
-    case 5.44444444444444444444444444444444444444444444444444444444444444444444444444444:
+    case (
+        5.44444444444444444444444444444444444444444444444444444444444444444444444444444
+    ):
         pass
 
 
@@ -385,108 +397,89 @@ match x:
 
 
 match x:
-    case "an implicit concatenated" "string literal" "in a match case" "that goes over multiple lines":
+    case (
+        "an implicit concatenated"
+        "string literal"
+        "in a match case"
+        "that goes over multiple lines"
+    ):
         pass
 
 
 ## Patterns ending with a sequence, mapping, class, or parenthesized pattern should break the parenthesized-like pattern first
 match x:
-    case (
+    case A | [
-        A
-        | [
         aaaaaa,
         bbbbbbbbbbbbbbbb,
         cccccccccccccccccc,
         ddddddddddddddddddddddddddd,
-        ]
+    ]:
-    ):
         pass
 
 match x:
-    case (
+    case A | (
-        A
-        | (
         aaaaaa,
         bbbbbbbbbbbbbbbb,
         cccccccccccccccccc,
         ddddddddddddddddddddddddddd,
-        )
     ):
         pass
 
 
 match x:
-    case (
+    case A | {
-        A
-        | {
         "a": aaaaaa,
         "b": bbbbbbbbbbbbbbbb,
         "c": cccccccccccccccccc,
         "d": ddddddddddddddddddddddddddd,
-        }
+    }:
-    ):
         pass
 
 
 match x:
-    case (
+    case A | Class(
-        A
-        | Class(
         aaaaaa,
         bbbbbbbbbbbbbbbb,
         cccccccccccccccccc,
         ddddddddddddddddddddddddddd,
-        )
     ):
         pass
 
 
 match x:
-    case (
+    case A | (
-        A
-        | (
         aaaaaaaaaaaaaaaaaaa.bbbbbbbbbbbbbbbbbbbbbbb.cccccccccccccccccccccccccccc.ddddddddddddddddddddddd
-        )
     ):
         pass
 
 
 ## Patterns starting with a sequence, mapping, class, or parenthesized pattern should break the parenthesized-like pattern first
 match x:
-    case (
+    case [
-        [
         aaaaaa,
         bbbbbbbbbbbbbbbb,
         cccccccccccccccccc,
         ddddddddddddddddddddddddddd,
-        ]
+    ] | A:
-        | A
-    ):
         pass
 
 match x:
     case (
-        (
         aaaaaa,
         bbbbbbbbbbbbbbbb,
         cccccccccccccccccc,
         ddddddddddddddddddddddddddd,
-        )
+    ) | A:
-        | A
-    ):
         pass
 
 
 match x:
-    case (
+    case {
-        {
         "a": aaaaaa,
         "b": bbbbbbbbbbbbbbbb,
         "c": cccccccccccccccccc,
         "d": ddddddddddddddddddddddddddd,
-        }
+    } | A:
-        | A
-    ):
         pass
 
 
@@ -503,8 +496,7 @@ match x:
 ## Not for non-parenthesized sequence patterns
 match x:
     case (
-        (1)
+        (1) | aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-        | aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         ccccccccccccccccccccccccccccccccc,
     ):
@@ -523,448 +515,81 @@ match x:
 
 ## Always use parentheses for implicitly concatenated strings
 match x:
-    case (
+    case "implicitconcatenatedstring" | [
-        "implicit" "concatenated" "string"
+        aaaaaa,
-        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
+        bbbbbbbbbbbbbbbb,
-    ):
+        cccccccccccccccccc,
+        ddddddddddddddddddddddddddd,
+    ]:
         pass
 
 
 match x:
-    case (
+    case b"implicitconcatenatedstring" | [
-        b"implicit" b"concatenated" b"string"
+        aaaaaa,
-        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
+        bbbbbbbbbbbbbbbb,
-    ):
+        cccccccccccccccccc,
+        ddddddddddddddddddddddddddd,
+    ]:
         pass
 
 
 match x:
-    case (
+    case f"implicitconcatenatedstring" | [
-        f"implicit" "concatenated" "string"
+        aaaaaa,
-        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
+        bbbbbbbbbbbbbbbb,
-    ):
+        cccccccccccccccccc,
+        ddddddddddddddddddddddddddd,
+    ]:
         pass
 
 
 ## Complex number expressions and unary expressions
 
 match x:
-    case (
+    case 4 - 3j | [
-        4 - 3j
-        | [
         aaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         cccccccccccccccccccccccccccccccccccccccc,
-        ]
+    ]:
-    ):
         pass
 
 
 match x:
-    case (
+    case 4 + 3j | [
-        4 + 3j
-        | [
         aaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         cccccccccccccccccccccccccccccccccccccccc,
-        ]
+    ]:
-    ):
         pass
 
 
 match x:
-    case (
+    case -1 | [
-        -1
-        | [
         aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         ccccccccccccccccccccccccccccccccc,
-        ]
+    ]:
-    ):
         pass
 
 
 ### Parenthesized patterns
 match x:
-    case (
+    case (1) | [
-        (1)
-        | [
         aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         ccccccccccccccccccccccccccccccccc,
-        ]
+    ]:
-    ):
         pass
 
 
 match x:
-    case (
+    case (  # comment
-        (  # comment
         1
-        )
+    ) | [
-        | [
         aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
         bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
         ccccccccccccccccccccccccccccccccc,
-        ]
+    ]:
-    ):
-        pass
-```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -1,31 +1,43 @@
- # Patterns that use BestFit should be parenthesized if they exceed the configured line width
- # but fit within parentheses.
- match x:
--    case "averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPar":
-+    case (
-+        "averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPar"
-+    ):
-         pass
- 
- 
- match x:
--    case b"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa":
-+    case (
-+        b"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa"
-+    ):
-         pass
- 
- match x:
--    case f"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa":
-+    case (
-+        f"averyLongStringThatGetsParenthesizedOnceItExceedsTheConfiguredLineWidthFitsPa"
-+    ):
-         pass
- 
- 
- match x:
--    case 5444444444444444444444444444444444444444444444444444444444444444444444444444444j:
-+    case (
-+        5444444444444444444444444444444444444444444444444444444444444444444444444444444j
-+    ):
-         pass
- 
- 
- match x:
--    case 5444444444444444444444444444444444444444444444444444444444444444444444444444444:
-+    case (
-+        5444444444444444444444444444444444444444444444444444444444444444444444444444444
-+    ):
-         pass
- 
- 
- match x:
--    case 5.44444444444444444444444444444444444444444444444444444444444444444444444444444:
-+    case (
-+        5.44444444444444444444444444444444444444444444444444444444444444444444444444444
-+    ):
-         pass
- 
- 
-@@ -82,108 +94,89 @@
- 
- 
- match x:
--    case "an implicit concatenated" "string literal" "in a match case" "that goes over multiple lines":
-+    case (
-+        "an implicit concatenated"
-+        "string literal"
-+        "in a match case"
-+        "that goes over multiple lines"
-+    ):
-         pass
- 
- 
- ## Patterns ending with a sequence, mapping, class, or parenthesized pattern should break the parenthesized-like pattern first
- match x:
--    case (
--        A
--        | [
--            aaaaaa,
--            bbbbbbbbbbbbbbbb,
--            cccccccccccccccccc,
--            ddddddddddddddddddddddddddd,
--        ]
--    ):
-+    case A | [
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ]:
-         pass
- 
- match x:
--    case (
--        A
--        | (
--            aaaaaa,
--            bbbbbbbbbbbbbbbb,
--            cccccccccccccccccc,
--            ddddddddddddddddddddddddddd,
--        )
-+    case A | (
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-     ):
-         pass
- 
- 
- match x:
--    case (
--        A
--        | {
--            "a": aaaaaa,
--            "b": bbbbbbbbbbbbbbbb,
--            "c": cccccccccccccccccc,
--            "d": ddddddddddddddddddddddddddd,
--        }
--    ):
-+    case A | {
-+        "a": aaaaaa,
-+        "b": bbbbbbbbbbbbbbbb,
-+        "c": cccccccccccccccccc,
-+        "d": ddddddddddddddddddddddddddd,
-+    }:
-         pass
- 
- 
- match x:
--    case (
--        A
--        | Class(
--            aaaaaa,
--            bbbbbbbbbbbbbbbb,
--            cccccccccccccccccc,
--            ddddddddddddddddddddddddddd,
--        )
-+    case A | Class(
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-     ):
-         pass
- 
- 
- match x:
--    case (
--        A
--        | (
--            aaaaaaaaaaaaaaaaaaa.bbbbbbbbbbbbbbbbbbbbbbb.cccccccccccccccccccccccccccc.ddddddddddddddddddddddd
--        )
-+    case A | (
-+        aaaaaaaaaaaaaaaaaaa.bbbbbbbbbbbbbbbbbbbbbbb.cccccccccccccccccccccccccccc.ddddddddddddddddddddddd
-     ):
-         pass
- 
- 
- ## Patterns starting with a sequence, mapping, class, or parenthesized pattern should break the parenthesized-like pattern first
- match x:
--    case (
--        [
--            aaaaaa,
--            bbbbbbbbbbbbbbbb,
--            cccccccccccccccccc,
--            ddddddddddddddddddddddddddd,
--        ]
--        | A
--    ):
-+    case [
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ] | A:
-         pass
- 
- match x:
-     case (
--        (
--            aaaaaa,
--            bbbbbbbbbbbbbbbb,
--            cccccccccccccccccc,
--            ddddddddddddddddddddddddddd,
--        )
--        | A
--    ):
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ) | A:
-         pass
- 
- 
- match x:
--    case (
--        {
--            "a": aaaaaa,
--            "b": bbbbbbbbbbbbbbbb,
--            "c": cccccccccccccccccc,
--            "d": ddddddddddddddddddddddddddd,
--        }
--        | A
--    ):
-+    case {
-+        "a": aaaaaa,
-+        "b": bbbbbbbbbbbbbbbb,
-+        "c": cccccccccccccccccc,
-+        "d": ddddddddddddddddddddddddddd,
-+    } | A:
-         pass
- 
- 
-@@ -200,8 +193,7 @@
- ## Not for non-parenthesized sequence patterns
- match x:
-     case (
--        (1)
--        | aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-+        (1) | aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-         bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-         ccccccccccccccccccccccccccccccccc,
-     ):
-@@ -220,89 +212,80 @@
- 
- ## Always use parentheses for implicitly concatenated strings
- match x:
--    case (
--        "implicit" "concatenated" "string"
--        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
--    ):
-+    case "implicitconcatenatedstring" | [
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ]:
-         pass
- 
- 
- match x:
--    case (
--        b"implicit" b"concatenated" b"string"
--        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
--    ):
-+    case b"implicitconcatenatedstring" | [
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ]:
-         pass
- 
- 
- match x:
--    case (
--        f"implicit" "concatenated" "string"
--        | [aaaaaa, bbbbbbbbbbbbbbbb, cccccccccccccccccc, ddddddddddddddddddddddddddd]
--    ):
-+    case f"implicitconcatenatedstring" | [
-+        aaaaaa,
-+        bbbbbbbbbbbbbbbb,
-+        cccccccccccccccccc,
-+        ddddddddddddddddddddddddddd,
-+    ]:
-         pass
- 
- 
- ## Complex number expressions and unary expressions
- 
- match x:
--    case (
--        4 - 3j
--        | [
--            aaaaaaaaaaaaaaaaaaaaaaaa,
--            bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
--            cccccccccccccccccccccccccccccccccccccccc,
--        ]
--    ):
-+    case 4 - 3j | [
-+        aaaaaaaaaaaaaaaaaaaaaaaa,
-+        bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-+        cccccccccccccccccccccccccccccccccccccccc,
-+    ]:
-         pass
- 
- 
- match x:
--    case (
--        4 + 3j
--        | [
--            aaaaaaaaaaaaaaaaaaaaaaaa,
--            bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
--            cccccccccccccccccccccccccccccccccccccccc,
--        ]
--    ):
-+    case 4 + 3j | [
-+        aaaaaaaaaaaaaaaaaaaaaaaa,
-+        bbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-+        cccccccccccccccccccccccccccccccccccccccc,
-+    ]:
-         pass
- 
- 
- match x:
--    case (
--        -1
--        | [
--            aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
--            bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
--            ccccccccccccccccccccccccccccccccc,
--        ]
--    ):
-+    case -1 | [
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-+        bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-+        ccccccccccccccccccccccccccccccccc,
-+    ]:
-         pass
- 
- 
- ### Parenthesized patterns
- match x:
--    case (
--        (1)
--        | [
--            aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
--            bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
--            ccccccccccccccccccccccccccccccccc,
--        ]
--    ):
-+    case (1) | [
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-+        bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-+        ccccccccccccccccccccccccccccccccc,
-+    ]:
-         pass
- 
- 
- match x:
--    case (
--        (  # comment
--            1
--        )
--        | [
--            aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
--            bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
--            ccccccccccccccccccccccccccccccccc,
--        ]
--    ):
-+    case (  # comment
-+        1
-+    ) | [
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-+        bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
-+        ccccccccccccccccccccccccccccccccc,
-+    ]:
         pass
 ```

crates/ruff_python_formatter/tests/snapshots/format@quote_style.py.snap

@@ -109,10 +109,10 @@ rb"""rb double triple"""
 rb"""br single triple"""
 rb"""br double triple"""
 
-'single1' 'single2'
+'single1single2'
-'single1' 'double2'
+'single1double2'
-'double1' 'single2'
+'double1single2'
-'double1' 'double2'
+'double1double2'
 
 
 def docstring_single_triple():
@@ -132,28 +132,6 @@ def docstring_single():
 ```
 
 
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -33,10 +33,10 @@
- rb"""br single triple"""
- rb"""br double triple"""
- 
--'single1' 'single2'
--'single1' 'double2'
--'double1' 'single2'
--'double1' 'double2'
-+'single1single2'
-+'single1double2'
-+'double1single2'
-+'double1double2'
- 
- 
- def docstring_single_triple():
-```
-
-
 ### Output 2
 ```
 indent-style               = space
@@ -205,10 +183,10 @@ rb"""rb double triple"""
 rb"""br single triple"""
 rb"""br double triple"""
 
-"single1" "single2"
+"single1single2"
-"single1" "double2"
+"single1double2"
-"double1" "single2"
+"double1single2"
-"double1" "double2"
+"double1double2"
 
 
 def docstring_single_triple():
@@ -228,28 +206,6 @@ def docstring_single():
 ```
 
 
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -33,10 +33,10 @@
- rb"""br single triple"""
- rb"""br double triple"""
- 
--"single1" "single2"
--"single1" "double2"
--"double1" "single2"
--"double1" "double2"
-+"single1single2"
-+"single1double2"
-+"double1single2"
-+"double1double2"
- 
- 
- def docstring_single_triple():
-```
-
-
 ### Output 3
 ```
 indent-style               = space
@@ -301,10 +257,10 @@ rb"""rb double triple"""
 rb'''br single triple'''
 rb"""br double triple"""
 
-'single1' 'single2'
+'single1single2'
-'single1' "double2"
+'single1double2'
-"double1" 'single2'
+"double1single2"
-"double1" "double2"
+"double1double2"
 
 
 def docstring_single_triple():
@@ -322,25 +278,3 @@ def docstring_double():
 def docstring_single():
     'single'
 ```
-
-
-#### Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -33,10 +33,10 @@
- rb'''br single triple'''
- rb"""br double triple"""
- 
--'single1' 'single2'
--'single1' "double2"
--"double1" 'single2'
--"double1" "double2"
-+'single1single2'
-+'single1double2'
-+"double1single2"
-+"double1double2"
- 
- 
- def docstring_single_triple():
-```

crates/ruff_python_formatter/tests/snapshots/format@range_formatting__stub.pyi.snap

@@ -1,7 +1,6 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
 input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/range_formatting/stub.pyi
-snapshot_kind: text
 ---
 ## Input
 ```python
@@ -34,7 +33,7 @@ line-ending                = LineFeed
 magic-trailing-comma       = Respect
 docstring-code             = Disabled
 docstring-code-line-width  = "dynamic"
-preview                    = Enabled
+preview                    = Disabled
 target_version             = Py39
 source_type                = Stub
 ```

crates/ruff_python_formatter/tests/snapshots/format@statement__assert.py.snap

@@ -212,8 +212,7 @@ assert (
 
 
 def test():
-    assert (
+    assert {
-        {
         key1: value1,
         key2: value2,
         key3: value3,
@@ -223,12 +222,11 @@ def test():
         key7: value7,
         key8: value8,
         key9: value9,
-        }
+    } == expected, (
-        == expected
+        "Not what we expected and the message is too long to fit ineeeeee one line"
-    ), "Not what we expected and the message is too long to fit ineeeeee one line"
+    )
 
-    assert (
+    assert {
-        {
         key1: value1,
         key2: value2,
         key3: value3,
@@ -238,12 +236,11 @@ def test():
         key7: value7,
         key8: value8,
         key9: value9,
-        }
+    } == expected, (
-        == expected
+        "Not what we expected and the message is too long to fit in one lineeeee"
-    ), "Not what we expected and the message is too long to fit in one lineeeee"
+    )
 
-    assert (
+    assert {
-        {
         key1: value1,
         key2: value2,
         key3: value3,
@@ -253,9 +250,9 @@ def test():
         key7: value7,
         key8: value8,
         key9: value9,
-        }
+    } == expected, (
-        == expected
+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeee"
-    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeee"
+    )
 
     assert (
         {
@@ -285,7 +282,9 @@ def test():
             key9: value9,
         }
         == expectedeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
-    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeee"
+    ), (
+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeee"
+    )
 
     assert expected == {
         key1: value1,
@@ -299,9 +298,7 @@ def test():
         key9: value9,
     }, "Not what we expected and the message is too long to fit ineeeeee one line"
 
-    assert (
+    assert expected == {
-        expected
-        == {
         key1: value1,
         key2: value2,
         key3: value3,
@@ -311,8 +308,9 @@ def test():
         key7: value7,
         key8: value8,
         key9: value9,
-        }
+    }, (
-    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeeeeee"
+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeeeeee"
+    )
 
     assert (
         expectedeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
@@ -342,7 +340,9 @@ def test():
             key8: value8,
             key9: value9,
         }
-    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeee"
+    ), (
+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeee"
+    )
 
 
 # Test for https://github.com/astral-sh/ruff/issues/7246
@@ -361,156 +361,3 @@ assert package.files == [
     },
 ]
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -30,50 +30,47 @@
- 
- 
- def test():
--    assert (
--        {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        }
--        == expected
--    ), "Not what we expected and the message is too long to fit ineeeeee one line"
-+    assert {
-+        key1: value1,
-+        key2: value2,
-+        key3: value3,
-+        key4: value4,
-+        key5: value5,
-+        key6: value6,
-+        key7: value7,
-+        key8: value8,
-+        key9: value9,
-+    } == expected, (
-+        "Not what we expected and the message is too long to fit ineeeeee one line"
-+    )
- 
--    assert (
--        {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        }
--        == expected
--    ), "Not what we expected and the message is too long to fit in one lineeeee"
-+    assert {
-+        key1: value1,
-+        key2: value2,
-+        key3: value3,
-+        key4: value4,
-+        key5: value5,
-+        key6: value6,
-+        key7: value7,
-+        key8: value8,
-+        key9: value9,
-+    } == expected, (
-+        "Not what we expected and the message is too long to fit in one lineeeee"
-+    )
- 
--    assert (
--        {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        }
--        == expected
--    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeee"
-+    assert {
-+        key1: value1,
-+        key2: value2,
-+        key3: value3,
-+        key4: value4,
-+        key5: value5,
-+        key6: value6,
-+        key7: value7,
-+        key8: value8,
-+        key9: value9,
-+    } == expected, (
-+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeee"
-+    )
- 
-     assert (
-         {
-@@ -103,7 +100,9 @@
-             key9: value9,
-         }
-         == expectedeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
--    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeee"
-+    ), (
-+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeee"
-+    )
- 
-     assert expected == {
-         key1: value1,
-@@ -117,20 +116,19 @@
-         key9: value9,
-     }, "Not what we expected and the message is too long to fit ineeeeee one line"
- 
--    assert (
--        expected
--        == {
--            key1: value1,
--            key2: value2,
--            key3: value3,
--            key4: value4,
--            key5: value5,
--            key6: value6,
--            key7: value7,
--            key8: value8,
--            key9: value9,
--        }
--    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeeeeee"
-+    assert expected == {
-+        key1: value1,
-+        key2: value2,
-+        key3: value3,
-+        key4: value4,
-+        key5: value5,
-+        key6: value6,
-+        key7: value7,
-+        key8: value8,
-+        key9: value9,
-+    }, (
-+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeeeeeeee"
-+    )
- 
-     assert (
-         expectedeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
-@@ -160,7 +158,9 @@
-             key8: value8,
-             key9: value9,
-         }
--    ), "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeee"
-+    ), (
-+        "Not what we expected and the message is too long to fit in one lineeeeeeeeeeeeeee"
-+    )
- 
- 
- # Test for https://github.com/astral-sh/ruff/issues/7246
-```

crates/ruff_python_formatter/tests/snapshots/format@statement__assignment_split_value_first.py.snap

@@ -1,7 +1,6 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
 input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/assignment_split_value_first.py
-snapshot_kind: text
 ---
 ## Input
 ```python
@@ -242,22 +241,7 @@ type A[VeryLongTypeNameThatShouldBreakFirstToTheRightBeforeSplitngtinthatExceeds
 
 ```
 
-## Outputs
+## Output
-### Output 1
-```
-indent-style               = space
-line-width                 = 88
-indent-width               = 4
-quote-style                = Double
-line-ending                = LineFeed
-magic-trailing-comma       = Respect
-docstring-code             = Disabled
-docstring-code-line-width  = "dynamic"
-preview                    = Enabled
-target_version             = Py39
-source_type                = Python
-```
-
 ```python
 #######
 # Unsplittable target and value

crates/ruff_python_formatter/tests/snapshots/format@statement__match.py.snap

@@ -695,7 +695,7 @@ match newlines:
     case "case comment with newlines" if foo == 2:  # second
         pass
 
-    case "one", "newline" if (foo := 1):  # third
+    case "one", "newline" if foo := 1:  # third
         pass
 
     case "two newlines":
@@ -708,7 +708,9 @@ match newlines:
 
 
 match long_lines:
-    case "this is a long line for if condition" if aaaaaaaaahhhhhhhh == 1 and bbbbbbaaaaaaaaaaa == 2:  # comment
+    case "this is a long line for if condition" if (
+        aaaaaaaaahhhhhhhh == 1 and bbbbbbaaaaaaaaaaa == 2
+    ):  # comment
         pass
 
     case "this is a long line for if condition with parentheses" if (
@@ -719,7 +721,7 @@ match long_lines:
     case "named expressions aren't special" if foo := 1:
         pass
 
-    case "named expressions aren't that special" if (foo := 1):
+    case "named expressions aren't that special" if foo := 1:
         pass
 
     case "but with already broken long lines" if (
@@ -727,9 +729,9 @@ match long_lines:
     ):  # another comment
         pass
 
-    case {
+    case {"long_long_long_key": str(long_long_long_key)} if (
-        "long_long_long_key": str(long_long_long_key)
+        value := "long long long long long long long long long long long value"
-    } if value := "long long long long long long long long long long long value":
+    ):
         pass
 
 
@@ -824,7 +826,9 @@ match pattern_singleton:
         # trailing own 2
     ):
         pass
-    case True:  # trailing
+    case (
+        True  # trailing
+    ):
         pass
     case False:
         pass
@@ -875,7 +879,9 @@ match foo:
         1
     ):
         y = 1
-    case 1:  # comment
+    case (
+        1  # comment
+    ):
         y = 1
     case (
         1
@@ -1133,11 +1139,8 @@ match pattern_match_or:
         pass
 
     case (
-        (
         a  # trailing
-        )
+    ) | (b):
-        | (b)
-    ):
         pass
 
     case a | b | c:
@@ -1151,8 +1154,7 @@ match pattern_match_or:
         pass
 
     case (  # end of line
-        a
+        a | b
-        | b
         # own line
     ):
         pass
@@ -1284,98 +1286,3 @@ match guard_comments:
     ):
         pass
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -69,7 +69,7 @@
-     case "case comment with newlines" if foo == 2:  # second
-         pass
- 
--    case "one", "newline" if (foo := 1):  # third
-+    case "one", "newline" if foo := 1:  # third
-         pass
- 
-     case "two newlines":
-@@ -82,7 +82,9 @@
- 
- 
- match long_lines:
--    case "this is a long line for if condition" if aaaaaaaaahhhhhhhh == 1 and bbbbbbaaaaaaaaaaa == 2:  # comment
-+    case "this is a long line for if condition" if (
-+        aaaaaaaaahhhhhhhh == 1 and bbbbbbaaaaaaaaaaa == 2
-+    ):  # comment
-         pass
- 
-     case "this is a long line for if condition with parentheses" if (
-@@ -93,7 +95,7 @@
-     case "named expressions aren't special" if foo := 1:
-         pass
- 
--    case "named expressions aren't that special" if (foo := 1):
-+    case "named expressions aren't that special" if foo := 1:
-         pass
- 
-     case "but with already broken long lines" if (
-@@ -101,9 +103,9 @@
-     ):  # another comment
-         pass
- 
--    case {
--        "long_long_long_key": str(long_long_long_key)
--    } if value := "long long long long long long long long long long long value":
-+    case {"long_long_long_key": str(long_long_long_key)} if (
-+        value := "long long long long long long long long long long long value"
-+    ):
-         pass
- 
- 
-@@ -198,7 +200,9 @@
-         # trailing own 2
-     ):
-         pass
--    case True:  # trailing
-+    case (
-+        True  # trailing
-+    ):
-         pass
-     case False:
-         pass
-@@ -249,7 +253,9 @@
-         1
-     ):
-         y = 1
--    case 1:  # comment
-+    case (
-+        1  # comment
-+    ):
-         y = 1
-     case (
-         1
-@@ -507,11 +513,8 @@
-         pass
- 
-     case (
--        (
--            a  # trailing
--        )
--        | (b)
--    ):
-+        a  # trailing
-+    ) | (b):
-         pass
- 
-     case a | b | c:
-@@ -525,8 +528,7 @@
-         pass
- 
-     case (  # end of line
--        a
--        | b
-+        a | b
-         # own line
-     ):
-         pass
-```

crates/ruff_python_formatter/tests/snapshots/format@statement__return_annotation.py.snap

@@ -336,32 +336,24 @@ def f[aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa](
 
 # Breaking return type annotations. Black adds parentheses if the parameters are
 # empty; otherwise, it leverages the expressions own parentheses if possible.
-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-    Set[
     "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-    ]
+]: ...
-): ...
 
 
-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-    Set[
     "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-    ]
+]: ...
-): ...
 
 
-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-    Set[
     "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-    ]
+]: ...
-): ...
 
 
-def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-    Set[
     "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-    ]
+]: ...
-): ...
 
 
 def xxxxxxxxxxxxxxxxxxxxxxxxxxxx(
@@ -462,11 +454,8 @@ def xxxxxxxxxxxxxxxxxxxxxxxxxxxx(
 ): ...
 
 
-def double() -> (
+def double() -> first_item and foo.bar.baz().bop(
-    first_item
-    and foo.bar.baz().bop(
     1,
-    )
 ):
     return 2 * a
 
@@ -520,69 +509,3 @@ def process_board_action(
 ) -> Optional[Tuple[str, str]]:
     pass
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -131,32 +131,24 @@
- 
- # Breaking return type annotations. Black adds parentheses if the parameters are
- # empty; otherwise, it leverages the expressions own parentheses if possible.
--def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
--    Set[
--        "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
--    ]
--): ...
-+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-+]: ...
- 
- 
--def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
--    Set[
--        "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
--    ]
--): ...
-+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-+]: ...
- 
- 
--def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
--    Set[
--        "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
--    ]
--): ...
-+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-+]: ...
- 
- 
--def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> (
--    Set[
--        "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
--    ]
--): ...
-+def xxxxxxxxxxxxxxxxxxxxxxxxxxxx() -> Set[
-+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-+]: ...
- 
- 
- def xxxxxxxxxxxxxxxxxxxxxxxxxxxx(
-@@ -257,11 +249,8 @@
- ): ...
- 
- 
--def double() -> (
--    first_item
--    and foo.bar.baz().bop(
--        1,
--    )
-+def double() -> first_item and foo.bar.baz().bop(
-+    1,
- ):
-     return 2 * a
- 
-```

crates/ruff_python_formatter/tests/snapshots/format@statement__return_type_no_parameters.py.snap

@@ -245,11 +245,9 @@ def test_return_union_with_elements_exceeding_length() -> (
 #########################################################################################
 
 
-def test_return_multiline_string_type_annotation() -> (
+def test_return_multiline_string_type_annotation() -> """str
-    """str
     | list[str]
-"""
+""":
-):
     pass
 
 
@@ -267,12 +265,12 @@ def test_return_multiline_string_binary_expression_return_type_annotation() -> (
 #########################################################################################
 
 
-def test_implicit_concatenated_string_return_type() -> "str" "bbbbbbbbbbbbbbbb":
+def test_implicit_concatenated_string_return_type() -> "strbbbbbbbbbbbbbbbb":
     pass
 
 
 def test_overlong_implicit_concatenated_string_return_type() -> (
-    "liiiiiiiiiiiisssssst[str]" "bbbbbbbbbbbbbbbb"
+    "liiiiiiiiiiiisssssst[str]bbbbbbbbbbbbbbbb"
 ):
     pass
 
@@ -295,9 +293,9 @@ def no_parameters_subscript_return_type() -> list[str]:
 # 1. Black tries to keep the list flat by parenthesizing the list as shown below even when the `list` identifier
 #    fits on the header line. IMO, this adds unnecessary parentheses that can be avoided
 #    and supporting it requires extra complexity (best_fitting! layout)
-def no_parameters_overlong_subscript_return_type_with_single_element() -> (
+def no_parameters_overlong_subscript_return_type_with_single_element() -> list[
-    list[xxxxxxxxxxxxxxxxxxxxx]
+    xxxxxxxxxxxxxxxxxxxxx
-):
+]:
     pass
 
 
@@ -306,23 +304,18 @@ def no_parameters_overlong_subscript_return_type_with_single_element() -> (
 #    `list[`. It is also inconsistent with how subscripts are normally formatted where it first tries to fit the entire subscript,
 #     then splits after `list[` but keeps all elements on a single line, and finally, splits after each element.
 # IMO: Splitting after the `list[` and trying to keep the elements together when possible seems more consistent.
-def no_parameters_subscript_return_type_multiple_elements() -> (
+def no_parameters_subscript_return_type_multiple_elements() -> list[
-    list[
+    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
+]:
-        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
-    ]
-):
     pass
 
 
 # Black removes the parentheses even the elements exceed the configured line width.
 # So does Ruff.
-def no_parameters_subscript_return_type_multiple_overlong_elements() -> (
+def no_parameters_subscript_return_type_multiple_overlong_elements() -> list[
-    list[
     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
-    ]
+]:
-):
     pass
 
 
@@ -341,11 +334,9 @@ def no_parameters_subscriptreturn_type_with_overlong_value_() -> (
 # `no_parameters_subscript_return_type_multiple_overlong_elements` shows. However, it doesn't
 # when the subscript contains a single element. Black then keeps the parentheses.
 # Ruff removes the parentheses in this case for consistency.
-def no_parameters_overlong_subscript_return_type_with_overlong_single_element() -> (
+def no_parameters_overlong_subscript_return_type_with_overlong_single_element() -> list[
-    list[
     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-    ]
+]:
-):
     pass
 
 
@@ -354,13 +345,10 @@ def no_parameters_overlong_subscript_return_type_with_overlong_single_element()
 #########################################################################################
 
 
-def test_binary_expression_return_type_annotation() -> (
+def test_binary_expression_return_type_annotation() -> aaaaaaaaaaaaaaaaaaaaaaaaaa > [
-    aaaaaaaaaaaaaaaaaaaaaaaaaa
-    > [
     aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
     bbbbbbbbbbbbbbbbbbbbbbbbb,
-    ]
+]:
-):
     pass
 
 
@@ -370,139 +358,9 @@ def test_binary_expression_return_type_annotation() -> (
 
 
 # Don't paranthesize lists
-def f() -> (
+def f() -> [
-    [
     a,
     b,
-    ]
+]:
-):
-    pass
-```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -58,11 +58,9 @@
- #########################################################################################
- 
- 
--def test_return_multiline_string_type_annotation() -> (
--    """str
-+def test_return_multiline_string_type_annotation() -> """str
-     | list[str]
--"""
--):
-+""":
-     pass
- 
- 
-@@ -80,12 +78,12 @@
- #########################################################################################
- 
- 
--def test_implicit_concatenated_string_return_type() -> "str" "bbbbbbbbbbbbbbbb":
-+def test_implicit_concatenated_string_return_type() -> "strbbbbbbbbbbbbbbbb":
-     pass
- 
- 
- def test_overlong_implicit_concatenated_string_return_type() -> (
--    "liiiiiiiiiiiisssssst[str]" "bbbbbbbbbbbbbbbb"
-+    "liiiiiiiiiiiisssssst[str]bbbbbbbbbbbbbbbb"
- ):
-     pass
- 
-@@ -108,9 +106,9 @@
- # 1. Black tries to keep the list flat by parenthesizing the list as shown below even when the `list` identifier
- #    fits on the header line. IMO, this adds unnecessary parentheses that can be avoided
- #    and supporting it requires extra complexity (best_fitting! layout)
--def no_parameters_overlong_subscript_return_type_with_single_element() -> (
--    list[xxxxxxxxxxxxxxxxxxxxx]
--):
-+def no_parameters_overlong_subscript_return_type_with_single_element() -> list[
-+    xxxxxxxxxxxxxxxxxxxxx
-+]:
-     pass
- 
- 
-@@ -119,23 +117,18 @@
- #    `list[`. It is also inconsistent with how subscripts are normally formatted where it first tries to fit the entire subscript,
- #     then splits after `list[` but keeps all elements on a single line, and finally, splits after each element.
- # IMO: Splitting after the `list[` and trying to keep the elements together when possible seems more consistent.
--def no_parameters_subscript_return_type_multiple_elements() -> (
--    list[
--        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
--        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
--    ]
--):
-+def no_parameters_subscript_return_type_multiple_elements() -> list[
-+    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-+]:
-     pass
- 
- 
- # Black removes the parentheses even the elements exceed the configured line width.
- # So does Ruff.
--def no_parameters_subscript_return_type_multiple_overlong_elements() -> (
--    list[
--        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
--        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
--    ]
--):
-+def no_parameters_subscript_return_type_multiple_overlong_elements() -> list[
-+    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
-+    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
-+]:
-     pass
- 
- 
-@@ -154,11 +147,9 @@
- # `no_parameters_subscript_return_type_multiple_overlong_elements` shows. However, it doesn't
- # when the subscript contains a single element. Black then keeps the parentheses.
- # Ruff removes the parentheses in this case for consistency.
--def no_parameters_overlong_subscript_return_type_with_overlong_single_element() -> (
--    list[
--        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
--    ]
--):
-+def no_parameters_overlong_subscript_return_type_with_overlong_single_element() -> list[
-+    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-+]:
-     pass
- 
- 
-@@ -167,13 +158,10 @@
- #########################################################################################
- 
- 
--def test_binary_expression_return_type_annotation() -> (
--    aaaaaaaaaaaaaaaaaaaaaaaaaa
--    > [
--        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
--        bbbbbbbbbbbbbbbbbbbbbbbbb,
--    ]
--):
-+def test_binary_expression_return_type_annotation() -> aaaaaaaaaaaaaaaaaaaaaaaaaa > [
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-+    bbbbbbbbbbbbbbbbbbbbbbbbb,
-+]:
-     pass
- 
- 
-@@ -183,10 +171,8 @@
- 
- 
- # Don't paranthesize lists
--def f() -> (
--    [
--        a,
--        b,
--    ]
--):
-+def f() -> [
-+    a,
-+    b,
-+]:
     pass
 ```

crates/ruff_python_formatter/tests/snapshots/format@statement__return_type_parameters.py.snap

@@ -288,13 +288,13 @@ def test_return_multiline_string_binary_expression_return_type_annotation(
 #########################################################################################
 
 
-def test_implicit_concatenated_string_return_type(a) -> "str" "bbbbbbbbbbbbbbbb":
+def test_implicit_concatenated_string_return_type(a) -> "strbbbbbbbbbbbbbbbb":
     pass
 
 
 def test_overlong_implicit_concatenated_string_return_type(
     a,
-) -> "liiiiiiiiiiiisssssst[str]" "bbbbbbbbbbbbbbbb":
+) -> "liiiiiiiiiiiisssssst[str]bbbbbbbbbbbbbbbb":
     pass
 
 
@@ -413,26 +413,3 @@ def test_return_multiline_string_binary_expression_return_type_annotation(
 ]:
     pass
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -82,13 +82,13 @@
- #########################################################################################
- 
- 
--def test_implicit_concatenated_string_return_type(a) -> "str" "bbbbbbbbbbbbbbbb":
-+def test_implicit_concatenated_string_return_type(a) -> "strbbbbbbbbbbbbbbbb":
-     pass
- 
- 
- def test_overlong_implicit_concatenated_string_return_type(
-     a,
--) -> "liiiiiiiiiiiisssssst[str]" "bbbbbbbbbbbbbbbb":
-+) -> "liiiiiiiiiiiisssssst[str]bbbbbbbbbbbbbbbb":
-     pass
- 
- 
-```

crates/ruff_python_formatter/tests/snapshots/format@statement__with.py.snap

@@ -1,7 +1,6 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
 input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/with.py
-snapshot_kind: text
 ---
 ## Input
 ```python
@@ -444,7 +443,9 @@ with (
 with a:  # should remove brackets
     pass
 
-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as c:
+with (
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+) as c:
     pass
 
 
@@ -609,7 +610,9 @@ with (  # outer comment
     pass
 
 # Breaking of with items.
-with test as (  # bar  # foo
+with (
+    test  # bar
+) as (  # foo
     # test
     foo
 ):
@@ -621,7 +624,9 @@ with test as (
 ):
     pass
 
-with test as (  # bar  # foo  # baz
+with (
+    test  # bar
+) as (  # foo  # baz
     # test
     foo
 ):
@@ -674,7 +679,9 @@ with (
 ) as b:
     pass
 
-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
+with (
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+) as b:
     pass
 
 with (
@@ -717,15 +724,19 @@ if True:
         pass
 
 if True:
-    with anyio.CancelScope(
+    with (
-        shield=True
+        anyio.CancelScope(shield=True)
-    ) if get_running_loop() else contextlib.nullcontext():
+        if get_running_loop()
+        else contextlib.nullcontext()
+    ):
         pass
 
 if True:
-    with anyio.CancelScope(
+    with (
-        shield=True
+        anyio.CancelScope(shield=True)
-    ) if get_running_loop() else contextlib.nullcontext() as c:
+        if get_running_loop()
+        else contextlib.nullcontext()
+    ) as c:
         pass
 
 with Child(aaaaaaaaa, bbbbbbbbbbbbbbb, cccccc), Document(
@@ -739,16 +750,22 @@ with open(
 ):
     pass
 
-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb:
+with (
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+):
     pass
 
-with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
+with (
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+) as b:
     pass
 
 if True:
-    with anyio.CancelScope(
+    with (
-        shield=True
+        anyio.CancelScope(shield=True)
-    ) if get_running_loop() else contextlib.nullcontext() as b:
+        if get_running_loop()
+        else contextlib.nullcontext()
+    ) as b:
         pass
 
 
@@ -800,103 +817,7 @@ with (
 ```diff
 --- Stable
 +++ Preview
-@@ -49,7 +49,9 @@
+@@ -377,42 +377,36 @@
- with a:  # should remove brackets
-     pass
- 
--with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as c:
-+with (
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-+) as c:
-     pass
- 
- 
-@@ -214,7 +216,9 @@
-     pass
- 
- # Breaking of with items.
--with test as (  # bar  # foo
-+with (
-+    test  # bar
-+) as (  # foo
-     # test
-     foo
- ):
-@@ -226,7 +230,9 @@
- ):
-     pass
- 
--with test as (  # bar  # foo  # baz
-+with (
-+    test  # bar
-+) as (  # foo  # baz
-     # test
-     foo
- ):
-@@ -279,7 +285,9 @@
- ) as b:
-     pass
- 
--with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
-+with (
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-+) as b:
-     pass
- 
- with (
-@@ -322,15 +330,19 @@
-         pass
- 
- if True:
--    with anyio.CancelScope(
--        shield=True
--    ) if get_running_loop() else contextlib.nullcontext():
-+    with (
-+        anyio.CancelScope(shield=True)
-+        if get_running_loop()
-+        else contextlib.nullcontext()
-+    ):
-         pass
- 
- if True:
--    with anyio.CancelScope(
--        shield=True
--    ) if get_running_loop() else contextlib.nullcontext() as c:
-+    with (
-+        anyio.CancelScope(shield=True)
-+        if get_running_loop()
-+        else contextlib.nullcontext()
-+    ) as c:
-         pass
- 
- with Child(aaaaaaaaa, bbbbbbbbbbbbbbb, cccccc), Document(
-@@ -344,57 +356,57 @@
- ):
-     pass
- 
--with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb:
-+with (
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-+):
-     pass
- 
--with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as b:
-+with (
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
-+) as b:
-     pass
- 
- if True:
--    with anyio.CancelScope(
--        shield=True
--    ) if get_running_loop() else contextlib.nullcontext() as b:
-+    with (
-+        anyio.CancelScope(shield=True)
-+        if get_running_loop()
-+        else contextlib.nullcontext()
-+    ) as b:
-         pass
- 
  
  # Regression test for https://github.com/astral-sh/ruff/issues/14001
  with (