diff --git a/crates/ruff_python_formatter/src/expression/expr_lambda.rs b/crates/ruff_python_formatter/src/expression/expr_lambda.rs
index 14ec1393d8c7f4..e984d8bec8d0c4 100644
--- a/crates/ruff_python_formatter/src/expression/expr_lambda.rs
+++ b/crates/ruff_python_formatter/src/expression/expr_lambda.rs
@@ -10,7 +10,6 @@ use crate::expression::parentheses::{
 use crate::expression::{CallChainLayout, has_own_parentheses};
 use crate::other::parameters::ParametersParentheses;
 use crate::prelude::*;
-use crate::preview::is_parenthesize_lambda_bodies_enabled;
 
 #[derive(Default)]
 pub struct FormatExprLambda {
@@ -31,7 +30,6 @@ impl FormatNodeRule<ExprLambda> for FormatExprLambda {
 
         let comments = f.context().comments().clone();
         let dangling = comments.dangling(item);
-        let preview = is_parenthesize_lambda_bodies_enabled(f.context());
 
         write!(f, [token("lambda")])?;
 
@@ -108,7 +106,7 @@ impl FormatNodeRule<ExprLambda> for FormatExprLambda {
             }
 
             // Try to keep the parameters on a single line, unless there are intervening comments.
-            if preview && !comments.contains_comments(parameters.into()) {
+            if !comments.contains_comments(parameters.into()) {
                 let mut buffer = RemoveSoftLinesBuffer::new(f);
                 write!(
                     buffer,
@@ -134,12 +132,6 @@ impl FormatNodeRule<ExprLambda> for FormatExprLambda {
 
         if dangling_header_comments.is_empty() {
             write!(f, [space()])?;
-        } else if !preview {
-            write!(f, [dangling_comments(dangling_header_comments)])?;
-        }
-
-        if !preview {
-            return body.format().fmt(f);
         }
 
         let fmt_body = FormatBody {
diff --git a/crates/ruff_python_formatter/src/preview.rs b/crates/ruff_python_formatter/src/preview.rs
index 4675fbc075fe61..3cc6ce46eef09e 100644
--- a/crates/ruff_python_formatter/src/preview.rs
+++ b/crates/ruff_python_formatter/src/preview.rs
@@ -13,10 +13,3 @@ pub(crate) const fn is_hug_parens_with_braces_and_square_brackets_enabled(
 ) -> bool {
     context.is_preview()
 }
-
-/// Returns `true` if the
-/// [`parenthesize_lambda_bodies`](https://github.com/astral-sh/ruff/pull/21385) preview style is
-/// enabled.
-pub(crate) const fn is_parenthesize_lambda_bodies_enabled(context: &PyFormatContext) -> bool {
-    context.is_preview()
-}
diff --git a/crates/ruff_python_formatter/src/statement/stmt_assign.rs b/crates/ruff_python_formatter/src/statement/stmt_assign.rs
index 4a2ae5579b3155..a8ecf3fedb7b2d 100644
--- a/crates/ruff_python_formatter/src/statement/stmt_assign.rs
+++ b/crates/ruff_python_formatter/src/statement/stmt_assign.rs
@@ -20,7 +20,6 @@ use crate::expression::{
 };
 use crate::other::interpolated_string::InterpolatedStringLayout;
 use crate::prelude::*;
-use crate::preview::is_parenthesize_lambda_bodies_enabled;
 use crate::statement::trailing_semicolon;
 use crate::string::StringLikeExtensions;
 use crate::string::implicit::{
@@ -1355,7 +1354,7 @@ fn is_attribute_with_parenthesized_value(target: &Expr, context: &PyFormatContex
     }
 }
 
-/// Like [`maybe_parenthesize_expression`] but with special handling for lambdas in preview.
+/// Like [`maybe_parenthesize_expression`] but with special handling for lambdas.
 fn maybe_parenthesize_value<'a>(
     expression: &'a Expr,
     parent: AnyNodeRef<'a>,
@@ -1372,8 +1371,7 @@ impl Format<PyFormatContext<'_>> for MaybeParenthesizeValue<'_> {
     fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
         let MaybeParenthesizeValue { expression, parent } = self;
 
-        if is_parenthesize_lambda_bodies_enabled(f.context())
-            && let Expr::Lambda(lambda) = expression
+        if let Expr::Lambda(lambda) = expression
             && !f.context().comments().has_leading(lambda)
         {
             parenthesize_if_expands(&lambda.format().with_options(ExprLambdaLayout::Assignment))
diff --git a/crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__comments_in_blocks.py.snap b/crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__comments_in_blocks.py.snap
index 571cf3820041b0..c24b2779c0c85a 100644
--- a/crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__comments_in_blocks.py.snap
+++ b/crates/ruff_python_formatter/tests/snapshots/black_compatibility@cases__comments_in_blocks.py.snap
@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
-input_file: crates/ruff_python_formatter/resources/test/fixtures/black/cases/comments_in_blocks.py
 ---
 ## Input
 
@@ -123,29 +122,43 @@ if (
 ```diff
 --- Black
 +++ Ruff
-@@ -5,9 +5,9 @@
+@@ -5,23 +5,25 @@
  # - https://github.com/psf/black/issues/563
  
  (
 -    lambda
-+    lambda:
-     # a comment
+-    # a comment
 -    : None
-+    None
++    lambda: (
++        # a comment
++        None
++    )
  )
  
  (
-@@ -17,9 +17,8 @@
+-    lambda:
+-    # b comment
+-    None
++    lambda: (
++        # b comment
++        None
++    )
  )
  
  (
 -    lambda
-+    lambda:
-     # a comment
+-    # a comment
 -    :
-     # b comment
-     None
+-    # b comment
+-    None
++    lambda: (
++        # a comment
++        # b comment
++        None
++    )
  )
+ 
+ [
 ```
 
 ## Ruff Output
@@ -158,22 +171,25 @@ if (
 # - https://github.com/psf/black/issues/563
 
 (
-    lambda:
-    # a comment
-    None
+    lambda: (
+        # a comment
+        None
+    )
 )
 
 (
-    lambda:
-    # b comment
-    None
+    lambda: (
+        # b comment
+        None
+    )
 )
 
 (
-    lambda:
-    # a comment
-    # b comment
-    None
+    lambda: (
+        # a comment
+        # b comment
+        None
+    )
 )
 
 [
diff --git a/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap b/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
index 86c65f585c47b2..0d9fd72e48dd77 100644
--- a/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
+++ b/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
@@ -851,35 +851,14 @@ lambda x: lambda y: lambda z: (x, y, z)  # Trailing
 # Trailing
 
 # Leading
-lambda x: lambda y: lambda z: (
-    x,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    z,
+lambda x: (
+    lambda y: (
+        lambda z: (x, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, z)
+    )
 )  # Trailing
 # Trailing
 
-a = (
-    lambda:  # Dangling
+a = lambda: (  # Dangling
     1
 )
 
@@ -898,7 +877,9 @@ a = (
 
 # lambda arguments don't have parentheses, so we never add a magic trailing comma ...
 def f(
-    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb = lambda x: y,
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb = lambda x: (
+        y
+    ),
 ):
     pass
 
@@ -926,22 +907,25 @@ lambda a, /, c: a
 
 # Dangling comments without parameters.
 (
-    lambda:  # 3
-    None
+    lambda: (  # 3
+        None
+    )
 )
 
 (
-    lambda:
-    # 3
-    None
+    lambda: (
+        # 3
+        None
+    )
 )
 
 (
-    lambda:  # 1
-    # 2
-    # 3
-    # 4
-    None  # 5
+    lambda: (  # 1
+        # 2
+        # 3
+        # 4
+        None
+    )  # 5
 )
 
 (
@@ -960,16 +944,18 @@ lambda a, /, c: a
     lambda
     # comment 1
     # comment 2
-    *x:
-    # comment 3
-    x
+    *x: (
+        # comment 3
+        x
+    )
 )
 
 (
     lambda  # comment 1
     # comment 2
-    *x:  # comment 3
-    x
+    *x: (  # comment 3
+        x
+    )
 )
 
 lambda *x: x
@@ -985,30 +971,33 @@ lambda: (  # comment
 )
 
 (
-    lambda:  # comment
-    x
+    lambda: (  # comment
+        x
+    )
 )
 
 (
-    lambda:
-    # comment
-    x
+    lambda: (
+        # comment
+        x
+    )
 )
 
 (
-    lambda:  # comment
-    x
+    lambda: (  # comment
+        x
+    )
 )
 
 (
-    lambda:
-    # comment
-    x
+    lambda: (
+        # comment
+        x
+    )
 )
 
 (
-    lambda:  # comment
-    (  # comment
+    lambda: (  # comment  # comment
         x
     )
 )
@@ -1016,11 +1005,12 @@ lambda: (  # comment
 (
     lambda  # 1
     # 2
-    x:  # 3
-    # 4
-    # 5
-    # 6
-    x
+    x: (  # 3
+        # 4
+        # 5
+        # 6
+        x
+    )
 )
 
 (
@@ -1028,9 +1018,10 @@ lambda: (  # comment
     # 2
     x,  # 3
     # 4
-    y:  # 5
-    # 6
-    x
+    y: (  # 5
+        # 6
+        x
+    )
 )
 
 (
@@ -1042,71 +1033,79 @@ lambda: (  # comment
 
 # Leading
 lambda x: (
-    lambda y: lambda z: x
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + y
-    + z  # Trailing
+    lambda y: (
+        lambda z: (
+            x
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + y
+            + z
+        )
+    )  # Trailing
 )  # Trailing
 
 
 # Leading
-lambda x: lambda y: lambda z: [
-    x,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    y,
-    z,
-]  # Trailing
+lambda x: (
+    lambda y: (
+        lambda z: [
+            x,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            y,
+            z,
+        ]
+    )
+)  # Trailing
 # Trailing
 
-lambda self, araa, kkkwargs=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(
-    *args, **kwargs
-), e=1, f=2, g=2: d
+lambda self, araa, kkkwargs=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs), e=1, f=2, g=2: (
+    d
+)
 
 
 # Regression tests for https://github.com/astral-sh/ruff/issues/8179
@@ -1115,9 +1114,9 @@ def a():
         c,
         d,
         e,
-        f=lambda self,
-        *args,
-        **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs),
+        f=lambda self, *args, **kwargs: (
+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
+        ),
     )
 
 
@@ -1126,15 +1125,9 @@ def a():
         c,
         d,
         e,
-        f=lambda self,
-        araa,
-        kkkwargs,
-        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
-        args,
-        kwargs,
-        e=1,
-        f=2,
-        g=2: d,
+        f=lambda self, araa, kkkwargs, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, args, kwargs, e=1, f=2, g=2: (
+            d
+        ),
         g=10,
     )
 
@@ -1144,9 +1137,9 @@ def a():
         c,
         d,
         e,
-        f=lambda self,
-        *args,
-        **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1,
+        f=lambda self, *args, **kwargs: (
+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+        ),
     )
 
 
@@ -1162,9 +1155,9 @@ class C:
 
 class C:
     function_dict: Dict[Text, Callable[[CRFToken], Any]] = {
-        CRFEntityExtractorOptions.POS2: lambda crf_token: crf_token.pos_tag[:2]
-        if crf_token.pos_tag is not None
-        else None,
+        CRFEntityExtractorOptions.POS2: lambda crf_token: (
+            crf_token.pos_tag[:2] if crf_token.pos_tag is not None else None
+        ),
     }
 
 
@@ -1176,42 +1169,40 @@ name = re.sub(
 def foo():
     if True:
         if True:
-            return (
-                lambda x: np.exp(cs(np.log(x.to(u.MeV).value))) * u.MeV * u.cm**2 / u.g
+            return lambda x: (
+                np.exp(cs(np.log(x.to(u.MeV).value))) * u.MeV * u.cm**2 / u.g
             )
 
 
 class C:
-    _is_recognized_dtype: Callable[[DtypeObj], bool] = lambda x: lib.is_np_dtype(
-        x, "M"
-    ) or isinstance(x, DatetimeTZDtype)
+    _is_recognized_dtype: Callable[[DtypeObj], bool] = lambda x: (
+        lib.is_np_dtype(x, "M") or isinstance(x, DatetimeTZDtype)
+    )
 
 
 class C:
     def foo():
         if True:
             transaction_count = self._query_txs_for_range(
-                get_count_fn=lambda from_ts,
-                to_ts,
-                _chain_id=chain_id: db_evmtx.count_transactions_in_range(
-                    chain_id=_chain_id,
-                    from_ts=from_ts,
-                    to_ts=to_ts,
+                get_count_fn=lambda from_ts, to_ts, _chain_id=chain_id: (
+                    db_evmtx.count_transactions_in_range(
+                        chain_id=_chain_id,
+                        from_ts=from_ts,
+                        to_ts=to_ts,
+                    )
                 ),
             )
 
             transaction_count = self._query_txs_for_range(
-                get_count_fn=lambda from_ts,
-                to_ts,
-                _chain_id=chain_id: db_evmtx.count_transactions_in_range[
-                    _chain_id, from_ts, to_ts
-                ],
+                get_count_fn=lambda from_ts, to_ts, _chain_id=chain_id: (
+                    db_evmtx.count_transactions_in_range[_chain_id, from_ts, to_ts]
+                ),
             )
 
 
 def ddb():
-    sql = (
-        lambda var, table, n=N: f"""
+    sql = lambda var, table, n=N: (
+        f"""
         CREATE TABLE {table} AS
         SELECT ROW_NUMBER() OVER () AS id, {var}
         FROM (
@@ -1225,18 +1216,19 @@ def ddb():
 
 long_assignment_target.with_attribute.and_a_slice[with_an_index] = (  # 1
     # 2
-    lambda x, y, z:  # 3
-    # 4
-    x + y + z  # 5
+    lambda x, y, z: (  # 3
+        # 4
+        x + y + z
+    )  # 5
     # 6
 )
 
-long_assignment_target.with_attribute.and_a_slice[with_an_index] = (
-    lambda x, y, z: x + y + z
+long_assignment_target.with_attribute.and_a_slice[with_an_index] = lambda x, y, z: (
+    x + y + z
 )
 
-long_assignment_target.with_attribute.and_a_slice[with_an_index] = (
-    lambda x, y, z: x + y + z
+long_assignment_target.with_attribute.and_a_slice[with_an_index] = lambda x, y, z: (
+    x + y + z
 )
 
 very_long_variable_name_x, very_long_variable_name_y = (
@@ -1244,8 +1236,8 @@ very_long_variable_name_x, very_long_variable_name_y = (
     lambda b: b * another_very_long_expression_here,
 )
 
-very_long_variable_name_for_result += (
-    lambda x: very_long_function_call_that_should_definitely_be_parenthesized_now(
+very_long_variable_name_for_result += lambda x: (
+    very_long_function_call_that_should_definitely_be_parenthesized_now(
         x, more_args, additional_parameters
     )
 )
@@ -1281,12 +1273,12 @@ class C:
     [
         # Not fluent
         param(
-            lambda left, right: (ibis.timestamp("2017-04-01")),
+            lambda left, right: ibis.timestamp("2017-04-01"),
         ),
         # These four are fluent and fit on one line inside the parenthesized
         # lambda body
         param(
-            lambda left, right: (ibis.timestamp("2017-04-01").cast(dt.date)),
+            lambda left, right: ibis.timestamp("2017-04-01").cast(dt.date),
         ),
         param(
             lambda left, right: (
@@ -1295,10 +1287,9 @@ class C:
         ),
         param(lambda left, right: ibis.timestamp("2017-04-01").cast(dt.date)),
         param(
-            lambda left, right: ibis
-            .timestamp("2017-04-01")
-            .cast(dt.date)
-            .between(left, right)
+            lambda left, right: (
+                ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
+            )
         ),
         # This is too long on one line in the lambda body and gets wrapped
         # inside the body.
@@ -1333,16 +1324,18 @@ lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz: [
 ]
 
 # adds parentheses around the body
-lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz: xxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyy + zzzzzzzzzzzzzzzzzzzz
+lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz: (
+    xxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyy + zzzzzzzzzzzzzzzzzzzz
+)
 
 # removes parentheses around the body
-lambda xxxxxxxxxxxxxxxxxxxx: (xxxxxxxxxxxxxxxxxxxx + 1)
+lambda xxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxx + 1
 
 mapper = lambda x: dict_with_default[
     np.nan if isinstance(x, float) and np.isnan(x) else x
 ]
 
-lambda x, y, z: (x + y + z)
+lambda x, y, z: x + y + z
 
 lambda x, y, z: (
     x + y + z
@@ -1353,7 +1346,7 @@ lambda x, y, z: (
     x + y + z  # trailing eol body
 )
 
-lambda x, y, z: (x + y + z)  # trailing lambda
+lambda x, y, z: x + y + z  # trailing lambda
 
 lambda x, y, z: (
     # leading body
@@ -1365,21 +1358,23 @@ lambda x, y, z: (  # leading eol body
 )
 
 (
-    lambda name: source_bucket  # trailing eol comment
-    if name == source_bucket_name
-    else storage.Bucket(mock_service, destination_bucket_name)
+    lambda name: (
+        source_bucket  # trailing eol comment
+        if name == source_bucket_name
+        else storage.Bucket(mock_service, destination_bucket_name)
+    )
 )
 
 (
-    lambda name:
-    # dangling header comment
-    source_bucket
-    if name == source_bucket_name
-    else storage.Bucket(mock_service, destination_bucket_name)
+    lambda name: (
+        # dangling header comment
+        source_bucket
+        if name == source_bucket_name
+        else storage.Bucket(mock_service, destination_bucket_name)
+    )
 )
 
-x = (
-    lambda name:
+x = lambda name: (
     # dangling header comment
     source_bucket
     if name == source_bucket_name
@@ -1387,8 +1382,7 @@ x = (
 )
 
 (
-    lambda name:  # dangling header comment
-    (
+    lambda name: (  # dangling header comment
         source_bucket
         if name == source_bucket_name
         else storage.Bucket(mock_service, destination_bucket_name)
@@ -1396,62 +1390,71 @@ x = (
 )
 
 (
-    lambda from_ts, to_ts, _chain_id=chain_id:  # dangling eol header comment
-    db_evmtx.count_transactions_in_range(
-        chain_id=_chain_id,
-        from_ts=from_ts,
-        to_ts=to_ts,
+    lambda from_ts, to_ts, _chain_id=chain_id: (  # dangling eol header comment
+        db_evmtx.count_transactions_in_range(
+            chain_id=_chain_id,
+            from_ts=from_ts,
+            to_ts=to_ts,
+        )
     )
 )
 
 (
-    lambda from_ts, to_ts, _chain_id=chain_id:
-    # dangling header comment before call
-    db_evmtx.count_transactions_in_range(
-        chain_id=_chain_id,
-        from_ts=from_ts,
-        to_ts=to_ts,
+    lambda from_ts, to_ts, _chain_id=chain_id: (
+        # dangling header comment before call
+        db_evmtx.count_transactions_in_range(
+            chain_id=_chain_id,
+            from_ts=from_ts,
+            to_ts=to_ts,
+        )
     )
 )
 
 (
-    lambda left, right:
-    # comment
-    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
+    lambda left, right: (
+        # comment
+        ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
+    )
 )
 
 (
-    lambda left, right: ibis
-    .timestamp("2017-04-01")  # comment
-    .cast(dt.date)
-    .between(left, right)
+    lambda left, right: (
+        ibis
+        .timestamp("2017-04-01")  # comment
+        .cast(dt.date)
+        .between(left, right)
+    )
 )
 
 (
-    lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy:
-    # comment
-    [xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz]
+    lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy: (
+        # comment
+        [xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz]
+    )
 )
 
 (
-    lambda x, y:
-    # comment
-    {
-        "key": x,
-        "another": y,
-    }
+    lambda x, y: (
+        # comment
+        {
+            "key": x,
+            "another": y,
+        }
+    )
 )
 
 (
-    lambda x, y:
-    # comment
-    (x, y, z)
+    lambda x, y: (
+        # comment
+        (x, y, z)
+    )
 )
 
 (
-    lambda x:
-    # comment
-    dict_with_default[np.nan if isinstance(x, float) and np.isnan(x) else x]
+    lambda x: (
+        # comment
+        dict_with_default[np.nan if isinstance(x, float) and np.isnan(x) else x]
+    )
 )
 
 (
@@ -1464,27 +1467,31 @@ x = (
 (
     lambda
     # comment
-    *args, **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
-    + 1
+    *args, **kwargs: (
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    )
 )
 
 (
     lambda  # comment
-    *args, **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
-    + 1
+    *args, **kwargs: (
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    )
 )
 
 (
     lambda  # comment 1
     # comment 2
-    *args, **kwargs:  # comment 3
-    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    *args, **kwargs: (  # comment 3
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    )
 )
 
 (
     lambda  # comment 1
-    *args, **kwargs:  # comment 3
-    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    *args, **kwargs: (  # comment 3
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
+    )
 )
 
 (
@@ -1499,25 +1506,28 @@ x = (
 )
 
 (
-    lambda *brgs, **kwargs:
-    # comment 1
-    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(  # comment 2
-        # comment 3
-        *brgs,
-        **kwargs,
-    )
-    + 1  # comment 4
+    lambda *brgs, **kwargs: (
+        # comment 1
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(  # comment 2
+            # comment 3
+            *brgs,
+            **kwargs,
+        )
+        + 1
+    )  # comment 4
     # comment 5
 )
 
 (
-    lambda *crgs, **kwargs:  # comment 1
-    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*crgs, **kwargs) + 1
+    lambda *crgs, **kwargs: (  # comment 1
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*crgs, **kwargs) + 1
+    )
 )
 
 (
-    lambda *drgs, **kwargs:  # comment 1
-    (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*drgs, **kwargs) + 1)
+    lambda *drgs, **kwargs: (  # comment 1
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*drgs, **kwargs) + 1
+    )
 )
 
 (
@@ -1525,9 +1535,9 @@ x = (
     # comment 1
     *ergs,
     # comment 2
-    **kwargs:  # comment 3
-    # comment 4
-    (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*ergs, **kwargs) + 1)
+    **kwargs: (  # comment 3  # comment 4
+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*ergs, **kwargs) + 1
+    )
 )
 
 (
@@ -1535,19 +1545,20 @@ x = (
     # 2
     left,  # 3
     # 4
-    right:  # 5
-    # 6
-    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
+    right: (  # 5
+        # 6
+        ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
+    )
 )
 
 (
-    lambda x:  # outer comment 1
-    (
-        lambda y:  # inner comment 1
-        # inner comment 2
-        lambda z: (
-            # innermost comment
-            x + y + z
+    lambda x: (  # outer comment 1
+        lambda y: (  # inner comment 1
+            # inner comment 2
+            lambda z: (
+                # innermost comment
+                x + y + z
+            )
         )
     )
 )
@@ -1565,49 +1576,52 @@ foo(
 foo(
     lambda from_ts,  # but still wrap the body if it gets too long
     to_ts,
-    _chain_id=chain_id: db_evmtx.count_transactions_in_rangeeeeeeeeeeeeeeeeeeeeeeeeeeeee(
-        chain_id=_chain_id,
-        from_ts=from_ts,
-        to_ts=to_ts,
+    _chain_id=chain_id: (
+        db_evmtx.count_transactions_in_rangeeeeeeeeeeeeeeeeeeeeeeeeeeeee(
+            chain_id=_chain_id,
+            from_ts=from_ts,
+            to_ts=to_ts,
+        )
     )
 )
 
-transform = (
-    lambda left, right: ibis
-    .timestamp("2017-04-01")
-    .cast(dt.date)
-    .between(left, right)
-    .between(left, right)
+transform = lambda left, right: (
+    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right).between(left, right)
 )  # trailing comment
 
 (
-    lambda:  # comment
-    1
+    lambda: (  # comment
+        1
+    )
 )
 
 (
-    lambda:  # comment
-    1
+    lambda: (  # comment
+        1
+    )
 )
 
 (
-    lambda:
-    # comment
-    1
+    lambda: (
+        # comment
+        1
+    )
 )
 
 (
-    lambda:  # comment 1
-    # comment 2
-    1
+    lambda: (  # comment 1
+        # comment 2
+        1
+    )
 )
 
 (
-    lambda:  # comment 1
-    # comment 2
-    # comment 3
-    # comment 4
-    1
+    lambda: (  # comment 1
+        # comment 2
+        # comment 3
+        # comment 4
+        1
+    )
 )
 
 (
@@ -1656,8 +1670,7 @@ transform = (
 )
 
 (
-    lambda:  # dangling-end-of-line
-    (  # leading-body-end-of-line
+    lambda: (  # dangling-end-of-line  # leading-body-end-of-line
         x
     )
 )
@@ -1665,930 +1678,8 @@ transform = (
 lambda x: (x := 1)
 
 (
-    lambda:  # dangling header comment
-    (x := 1)
+    lambda: (  # dangling header comment
+        x := 1
+    )
 )
 ```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -27,35 +27,14 @@
- # Trailing
- 
- # Leading
--lambda x: lambda y: lambda z: (
--    x,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    z,
-+lambda x: (
-+    lambda y: (
-+        lambda z: (x, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, z)
-+    )
- )  # Trailing
- # Trailing
- 
--a = (
--    lambda:  # Dangling
-+a = lambda: (  # Dangling
-     1
- )
- 
-@@ -74,7 +53,9 @@
- 
- # lambda arguments don't have parentheses, so we never add a magic trailing comma ...
- def f(
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb = lambda x: y,
-+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb = lambda x: (
-+        y
-+    ),
- ):
-     pass
- 
-@@ -102,22 +83,25 @@
- 
- # Dangling comments without parameters.
- (
--    lambda:  # 3
--    None
-+    lambda: (  # 3
-+        None
-+    )
- )
- 
- (
--    lambda:
--    # 3
--    None
-+    lambda: (
-+        # 3
-+        None
-+    )
- )
- 
- (
--    lambda:  # 1
--    # 2
--    # 3
--    # 4
--    None  # 5
-+    lambda: (  # 1
-+        # 2
-+        # 3
-+        # 4
-+        None
-+    )  # 5
- )
- 
- (
-@@ -136,16 +120,18 @@
-     lambda
-     # comment 1
-     # comment 2
--    *x:
--    # comment 3
--    x
-+    *x: (
-+        # comment 3
-+        x
-+    )
- )
- 
- (
-     lambda  # comment 1
-     # comment 2
--    *x:  # comment 3
--    x
-+    *x: (  # comment 3
-+        x
-+    )
- )
- 
- lambda *x: x
-@@ -161,30 +147,33 @@
- )
- 
- (
--    lambda:  # comment
--    x
-+    lambda: (  # comment
-+        x
-+    )
- )
- 
- (
--    lambda:
--    # comment
--    x
-+    lambda: (
-+        # comment
-+        x
-+    )
- )
- 
- (
--    lambda:  # comment
--    x
-+    lambda: (  # comment
-+        x
-+    )
- )
- 
- (
--    lambda:
--    # comment
--    x
-+    lambda: (
-+        # comment
-+        x
-+    )
- )
- 
- (
--    lambda:  # comment
--    (  # comment
-+    lambda: (  # comment  # comment
-         x
-     )
- )
-@@ -192,11 +181,12 @@
- (
-     lambda  # 1
-     # 2
--    x:  # 3
--    # 4
--    # 5
--    # 6
--    x
-+    x: (  # 3
-+        # 4
-+        # 5
-+        # 6
-+        x
-+    )
- )
- 
- (
-@@ -204,9 +194,10 @@
-     # 2
-     x,  # 3
-     # 4
--    y:  # 5
--    # 6
--    x
-+    y: (  # 5
-+        # 6
-+        x
-+    )
- )
- 
- (
-@@ -218,71 +209,79 @@
- 
- # Leading
- lambda x: (
--    lambda y: lambda z: x
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + y
--    + z  # Trailing
-+    lambda y: (
-+        lambda z: (
-+            x
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + y
-+            + z
-+        )
-+    )  # Trailing
- )  # Trailing
- 
- 
- # Leading
--lambda x: lambda y: lambda z: [
--    x,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    y,
--    z,
--]  # Trailing
-+lambda x: (
-+    lambda y: (
-+        lambda z: [
-+            x,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            y,
-+            z,
-+        ]
-+    )
-+)  # Trailing
- # Trailing
- 
--lambda self, araa, kkkwargs=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(
--    *args, **kwargs
--), e=1, f=2, g=2: d
-+lambda self, araa, kkkwargs=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs), e=1, f=2, g=2: (
-+    d
-+)
- 
- 
- # Regression tests for https://github.com/astral-sh/ruff/issues/8179
-@@ -291,9 +290,9 @@
-         c,
-         d,
-         e,
--        f=lambda self,
--        *args,
--        **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs),
-+        f=lambda self, *args, **kwargs: (
-+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
-+        ),
-     )
- 
- 
-@@ -302,15 +301,9 @@
-         c,
-         d,
-         e,
--        f=lambda self,
--        araa,
--        kkkwargs,
--        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
--        args,
--        kwargs,
--        e=1,
--        f=2,
--        g=2: d,
-+        f=lambda self, araa, kkkwargs, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, args, kwargs, e=1, f=2, g=2: (
-+            d
-+        ),
-         g=10,
-     )
- 
-@@ -320,9 +313,9 @@
-         c,
-         d,
-         e,
--        f=lambda self,
--        *args,
--        **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1,
-+        f=lambda self, *args, **kwargs: (
-+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+        ),
-     )
- 
- 
-@@ -338,9 +331,9 @@
- 
- class C:
-     function_dict: Dict[Text, Callable[[CRFToken], Any]] = {
--        CRFEntityExtractorOptions.POS2: lambda crf_token: crf_token.pos_tag[:2]
--        if crf_token.pos_tag is not None
--        else None,
-+        CRFEntityExtractorOptions.POS2: lambda crf_token: (
-+            crf_token.pos_tag[:2] if crf_token.pos_tag is not None else None
-+        ),
-     }
- 
- 
-@@ -352,42 +345,40 @@
- def foo():
-     if True:
-         if True:
--            return (
--                lambda x: np.exp(cs(np.log(x.to(u.MeV).value))) * u.MeV * u.cm**2 / u.g
-+            return lambda x: (
-+                np.exp(cs(np.log(x.to(u.MeV).value))) * u.MeV * u.cm**2 / u.g
-             )
- 
- 
- class C:
--    _is_recognized_dtype: Callable[[DtypeObj], bool] = lambda x: lib.is_np_dtype(
--        x, "M"
--    ) or isinstance(x, DatetimeTZDtype)
-+    _is_recognized_dtype: Callable[[DtypeObj], bool] = lambda x: (
-+        lib.is_np_dtype(x, "M") or isinstance(x, DatetimeTZDtype)
-+    )
- 
- 
- class C:
-     def foo():
-         if True:
-             transaction_count = self._query_txs_for_range(
--                get_count_fn=lambda from_ts,
--                to_ts,
--                _chain_id=chain_id: db_evmtx.count_transactions_in_range(
--                    chain_id=_chain_id,
--                    from_ts=from_ts,
--                    to_ts=to_ts,
-+                get_count_fn=lambda from_ts, to_ts, _chain_id=chain_id: (
-+                    db_evmtx.count_transactions_in_range(
-+                        chain_id=_chain_id,
-+                        from_ts=from_ts,
-+                        to_ts=to_ts,
-+                    )
-                 ),
-             )
- 
-             transaction_count = self._query_txs_for_range(
--                get_count_fn=lambda from_ts,
--                to_ts,
--                _chain_id=chain_id: db_evmtx.count_transactions_in_range[
--                    _chain_id, from_ts, to_ts
--                ],
-+                get_count_fn=lambda from_ts, to_ts, _chain_id=chain_id: (
-+                    db_evmtx.count_transactions_in_range[_chain_id, from_ts, to_ts]
-+                ),
-             )
- 
- 
- def ddb():
--    sql = (
--        lambda var, table, n=N: f"""
-+    sql = lambda var, table, n=N: (
-+        f"""
-         CREATE TABLE {table} AS
-         SELECT ROW_NUMBER() OVER () AS id, {var}
-         FROM (
-@@ -401,18 +392,19 @@
- 
- long_assignment_target.with_attribute.and_a_slice[with_an_index] = (  # 1
-     # 2
--    lambda x, y, z:  # 3
--    # 4
--    x + y + z  # 5
-+    lambda x, y, z: (  # 3
-+        # 4
-+        x + y + z
-+    )  # 5
-     # 6
- )
- 
--long_assignment_target.with_attribute.and_a_slice[with_an_index] = (
--    lambda x, y, z: x + y + z
-+long_assignment_target.with_attribute.and_a_slice[with_an_index] = lambda x, y, z: (
-+    x + y + z
- )
- 
--long_assignment_target.with_attribute.and_a_slice[with_an_index] = (
--    lambda x, y, z: x + y + z
-+long_assignment_target.with_attribute.and_a_slice[with_an_index] = lambda x, y, z: (
-+    x + y + z
- )
- 
- very_long_variable_name_x, very_long_variable_name_y = (
-@@ -420,8 +412,8 @@
-     lambda b: b * another_very_long_expression_here,
- )
- 
--very_long_variable_name_for_result += (
--    lambda x: very_long_function_call_that_should_definitely_be_parenthesized_now(
-+very_long_variable_name_for_result += lambda x: (
-+    very_long_function_call_that_should_definitely_be_parenthesized_now(
-         x, more_args, additional_parameters
-     )
- )
-@@ -457,12 +449,12 @@
-     [
-         # Not fluent
-         param(
--            lambda left, right: (ibis.timestamp("2017-04-01")),
-+            lambda left, right: ibis.timestamp("2017-04-01"),
-         ),
-         # These four are fluent and fit on one line inside the parenthesized
-         # lambda body
-         param(
--            lambda left, right: (ibis.timestamp("2017-04-01").cast(dt.date)),
-+            lambda left, right: ibis.timestamp("2017-04-01").cast(dt.date),
-         ),
-         param(
-             lambda left, right: (
-@@ -471,10 +463,9 @@
-         ),
-         param(lambda left, right: ibis.timestamp("2017-04-01").cast(dt.date)),
-         param(
--            lambda left, right: ibis
--            .timestamp("2017-04-01")
--            .cast(dt.date)
--            .between(left, right)
-+            lambda left, right: (
-+                ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
-+            )
-         ),
-         # This is too long on one line in the lambda body and gets wrapped
-         # inside the body.
-@@ -509,16 +500,18 @@
- ]
- 
- # adds parentheses around the body
--lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz: xxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyy + zzzzzzzzzzzzzzzzzzzz
-+lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz: (
-+    xxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyy + zzzzzzzzzzzzzzzzzzzz
-+)
- 
- # removes parentheses around the body
--lambda xxxxxxxxxxxxxxxxxxxx: (xxxxxxxxxxxxxxxxxxxx + 1)
-+lambda xxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxx + 1
- 
- mapper = lambda x: dict_with_default[
-     np.nan if isinstance(x, float) and np.isnan(x) else x
- ]
- 
--lambda x, y, z: (x + y + z)
-+lambda x, y, z: x + y + z
- 
- lambda x, y, z: (
-     x + y + z
-@@ -529,7 +522,7 @@
-     x + y + z  # trailing eol body
- )
- 
--lambda x, y, z: (x + y + z)  # trailing lambda
-+lambda x, y, z: x + y + z  # trailing lambda
- 
- lambda x, y, z: (
-     # leading body
-@@ -541,21 +534,23 @@
- )
- 
- (
--    lambda name: source_bucket  # trailing eol comment
--    if name == source_bucket_name
--    else storage.Bucket(mock_service, destination_bucket_name)
-+    lambda name: (
-+        source_bucket  # trailing eol comment
-+        if name == source_bucket_name
-+        else storage.Bucket(mock_service, destination_bucket_name)
-+    )
- )
- 
- (
--    lambda name:
--    # dangling header comment
--    source_bucket
--    if name == source_bucket_name
--    else storage.Bucket(mock_service, destination_bucket_name)
-+    lambda name: (
-+        # dangling header comment
-+        source_bucket
-+        if name == source_bucket_name
-+        else storage.Bucket(mock_service, destination_bucket_name)
-+    )
- )
- 
--x = (
--    lambda name:
-+x = lambda name: (
-     # dangling header comment
-     source_bucket
-     if name == source_bucket_name
-@@ -563,8 +558,7 @@
- )
- 
- (
--    lambda name:  # dangling header comment
--    (
-+    lambda name: (  # dangling header comment
-         source_bucket
-         if name == source_bucket_name
-         else storage.Bucket(mock_service, destination_bucket_name)
-@@ -572,62 +566,71 @@
- )
- 
- (
--    lambda from_ts, to_ts, _chain_id=chain_id:  # dangling eol header comment
--    db_evmtx.count_transactions_in_range(
--        chain_id=_chain_id,
--        from_ts=from_ts,
--        to_ts=to_ts,
-+    lambda from_ts, to_ts, _chain_id=chain_id: (  # dangling eol header comment
-+        db_evmtx.count_transactions_in_range(
-+            chain_id=_chain_id,
-+            from_ts=from_ts,
-+            to_ts=to_ts,
-+        )
-     )
- )
- 
- (
--    lambda from_ts, to_ts, _chain_id=chain_id:
--    # dangling header comment before call
--    db_evmtx.count_transactions_in_range(
--        chain_id=_chain_id,
--        from_ts=from_ts,
--        to_ts=to_ts,
-+    lambda from_ts, to_ts, _chain_id=chain_id: (
-+        # dangling header comment before call
-+        db_evmtx.count_transactions_in_range(
-+            chain_id=_chain_id,
-+            from_ts=from_ts,
-+            to_ts=to_ts,
-+        )
-     )
- )
- 
- (
--    lambda left, right:
--    # comment
--    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
-+    lambda left, right: (
-+        # comment
-+        ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
-+    )
- )
- 
- (
--    lambda left, right: ibis
--    .timestamp("2017-04-01")  # comment
--    .cast(dt.date)
--    .between(left, right)
-+    lambda left, right: (
-+        ibis
-+        .timestamp("2017-04-01")  # comment
-+        .cast(dt.date)
-+        .between(left, right)
-+    )
- )
- 
- (
--    lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy:
--    # comment
--    [xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz]
-+    lambda xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy: (
-+        # comment
-+        [xxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzz]
-+    )
- )
- 
- (
--    lambda x, y:
--    # comment
--    {
--        "key": x,
--        "another": y,
--    }
-+    lambda x, y: (
-+        # comment
-+        {
-+            "key": x,
-+            "another": y,
-+        }
-+    )
- )
- 
- (
--    lambda x, y:
--    # comment
--    (x, y, z)
-+    lambda x, y: (
-+        # comment
-+        (x, y, z)
-+    )
- )
- 
- (
--    lambda x:
--    # comment
--    dict_with_default[np.nan if isinstance(x, float) and np.isnan(x) else x]
-+    lambda x: (
-+        # comment
-+        dict_with_default[np.nan if isinstance(x, float) and np.isnan(x) else x]
-+    )
- )
- 
- (
-@@ -640,27 +643,31 @@
- (
-     lambda
-     # comment
--    *args, **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
--    + 1
-+    *args, **kwargs: (
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    )
- )
- 
- (
-     lambda  # comment
--    *args, **kwargs: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs)
--    + 1
-+    *args, **kwargs: (
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    )
- )
- 
- (
-     lambda  # comment 1
-     # comment 2
--    *args, **kwargs:  # comment 3
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    *args, **kwargs: (  # comment 3
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    )
- )
- 
- (
-     lambda  # comment 1
--    *args, **kwargs:  # comment 3
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    *args, **kwargs: (  # comment 3
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*args, **kwargs) + 1
-+    )
- )
- 
- (
-@@ -675,25 +682,28 @@
- )
- 
- (
--    lambda *brgs, **kwargs:
--    # comment 1
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(  # comment 2
--        # comment 3
--        *brgs,
--        **kwargs,
--    )
--    + 1  # comment 4
-+    lambda *brgs, **kwargs: (
-+        # comment 1
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(  # comment 2
-+            # comment 3
-+            *brgs,
-+            **kwargs,
-+        )
-+        + 1
-+    )  # comment 4
-     # comment 5
- )
- 
- (
--    lambda *crgs, **kwargs:  # comment 1
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*crgs, **kwargs) + 1
-+    lambda *crgs, **kwargs: (  # comment 1
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*crgs, **kwargs) + 1
-+    )
- )
- 
- (
--    lambda *drgs, **kwargs:  # comment 1
--    (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*drgs, **kwargs) + 1)
-+    lambda *drgs, **kwargs: (  # comment 1
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*drgs, **kwargs) + 1
-+    )
- )
- 
- (
-@@ -701,9 +711,9 @@
-     # comment 1
-     *ergs,
-     # comment 2
--    **kwargs:  # comment 3
--    # comment 4
--    (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*ergs, **kwargs) + 1)
-+    **kwargs: (  # comment 3  # comment 4
-+        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(*ergs, **kwargs) + 1
-+    )
- )
- 
- (
-@@ -711,19 +721,20 @@
-     # 2
-     left,  # 3
-     # 4
--    right:  # 5
--    # 6
--    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
-+    right: (  # 5
-+        # 6
-+        ibis.timestamp("2017-04-01").cast(dt.date).between(left, right)
-+    )
- )
- 
- (
--    lambda x:  # outer comment 1
--    (
--        lambda y:  # inner comment 1
--        # inner comment 2
--        lambda z: (
--            # innermost comment
--            x + y + z
-+    lambda x: (  # outer comment 1
-+        lambda y: (  # inner comment 1
-+            # inner comment 2
-+            lambda z: (
-+                # innermost comment
-+                x + y + z
-+            )
-         )
-     )
- )
-@@ -741,49 +752,52 @@
- foo(
-     lambda from_ts,  # but still wrap the body if it gets too long
-     to_ts,
--    _chain_id=chain_id: db_evmtx.count_transactions_in_rangeeeeeeeeeeeeeeeeeeeeeeeeeeeee(
--        chain_id=_chain_id,
--        from_ts=from_ts,
--        to_ts=to_ts,
-+    _chain_id=chain_id: (
-+        db_evmtx.count_transactions_in_rangeeeeeeeeeeeeeeeeeeeeeeeeeeeee(
-+            chain_id=_chain_id,
-+            from_ts=from_ts,
-+            to_ts=to_ts,
-+        )
-     )
- )
- 
--transform = (
--    lambda left, right: ibis
--    .timestamp("2017-04-01")
--    .cast(dt.date)
--    .between(left, right)
--    .between(left, right)
-+transform = lambda left, right: (
-+    ibis.timestamp("2017-04-01").cast(dt.date).between(left, right).between(left, right)
- )  # trailing comment
- 
- (
--    lambda:  # comment
--    1
-+    lambda: (  # comment
-+        1
-+    )
- )
- 
- (
--    lambda:  # comment
--    1
-+    lambda: (  # comment
-+        1
-+    )
- )
- 
- (
--    lambda:
--    # comment
--    1
-+    lambda: (
-+        # comment
-+        1
-+    )
- )
- 
- (
--    lambda:  # comment 1
--    # comment 2
--    1
-+    lambda: (  # comment 1
-+        # comment 2
-+        1
-+    )
- )
- 
- (
--    lambda:  # comment 1
--    # comment 2
--    # comment 3
--    # comment 4
--    1
-+    lambda: (  # comment 1
-+        # comment 2
-+        # comment 3
-+        # comment 4
-+        1
-+    )
- )
- 
- (
-@@ -832,8 +846,7 @@
- )
- 
- (
--    lambda:  # dangling-end-of-line
--    (  # leading-body-end-of-line
-+    lambda: (  # dangling-end-of-line  # leading-body-end-of-line
-         x
-     )
- )
-@@ -841,6 +854,7 @@
- lambda x: (x := 1)
- 
- (
--    lambda:  # dangling header comment
--    (x := 1)
-+    lambda: (  # dangling header comment
-+        x := 1
-+    )
- )
-```
diff --git a/crates/ruff_python_formatter/tests/snapshots/format@multiline_string_deviations.py.snap b/crates/ruff_python_formatter/tests/snapshots/format@multiline_string_deviations.py.snap
index 9504e52ae89435..2126c363b4aa81 100644
--- a/crates/ruff_python_formatter/tests/snapshots/format@multiline_string_deviations.py.snap
+++ b/crates/ruff_python_formatter/tests/snapshots/format@multiline_string_deviations.py.snap
@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_python_formatter/tests/fixtures.rs
-input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/multiline_string_deviations.py
 ---
 ## Input
 ```python
@@ -97,30 +96,9 @@ path.write_text(
 # this by changing `Lambda::needs_parentheses` to return `BestFit` but it causes
 # issues when the lambda has comments.
 # Let's keep this as a known deviation for now.
-generated_readme = (
-    lambda project_name: """
+generated_readme = lambda project_name: """
 {}
 
 <Add content here!>
 """.strip().format(project_name)
-)
-```
-
-
-## Preview changes
-```diff
---- Stable
-+++ Preview
-@@ -44,10 +44,8 @@
- # this by changing `Lambda::needs_parentheses` to return `BestFit` but it causes
- # issues when the lambda has comments.
- # Let's keep this as a known deviation for now.
--generated_readme = (
--    lambda project_name: """
-+generated_readme = lambda project_name: """
- {}
- 
- <Add content here!>
- """.strip().format(project_name)
--)
 ```