Format ExpressionStarred nodes (#5654)

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/starred.py

@@ -0,0 +1,15 @@
+call(
+    # Leading starred comment
+    * # Trailing star comment
+    [
+        # Leading value commnt
+        [What, i, this, s, very, long, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa]
+    ] # trailing value comment
+)
+
+call(
+    # Leading starred comment
+    * ( # Leading value commnt
+        [What, i, this, s, very, long, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa]
+    ) # trailing value comment
+)

crates/ruff_python_formatter/src/comments/mod.rs

@@ -87,11 +87,12 @@
 //!
 //! It is possible to add an additional optional label to [`SourceComment`] If ever the need arises to distinguish two *dangling comments* in the formatting logic,
 
+use ruff_text_size::TextRange;
 use std::cell::Cell;
 use std::fmt::Debug;
 use std::rc::Rc;
 
-use rustpython_parser::ast::Mod;
+use rustpython_parser::ast::{Mod, Ranged};
 
 pub(crate) use format::{
     dangling_comments, dangling_node_comments, leading_alternate_branch_comments, leading_comments,
@@ -114,7 +115,7 @@ mod placement;
 mod visitor;
 
 /// A comment in the source document.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Eq, PartialEq)]
 pub(crate) struct SourceComment {
     /// The location of the comment in the source document.
     slice: SourceCodeSlice,
@@ -155,15 +156,20 @@ impl SourceComment {
     pub(crate) fn is_unformatted(&self) -> bool {
         !self.is_formatted()
     }
-}
 
-impl SourceComment {
     /// Returns a nice debug representation that prints the source code for every comment (and not just the range).
     pub(crate) fn debug<'a>(&'a self, source_code: SourceCode<'a>) -> DebugComment<'a> {
         DebugComment::new(self, source_code)
     }
 }
 
+impl Ranged for SourceComment {
+    #[inline]
+    fn range(&self) -> TextRange {
+        self.slice.range()
+    }
+}
+
 /// The position of a comment in the source text.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub(crate) enum CommentLinePosition {

crates/ruff_python_formatter/src/comments/placement.rs

@@ -38,6 +38,7 @@ pub(super) fn place_comment<'a>(
         handle_slice_comments,
         handle_attribute_comment,
         handle_expr_if_comment,
+        handle_trailing_expression_starred_star_end_of_line_comment,
     ];
     for handler in HANDLERS {
         comment = match handler(comment, locator) {
@@ -1215,6 +1216,21 @@ fn handle_expr_if_comment<'a>(
     CommentPlacement::Default(comment)
 }
 
+fn handle_trailing_expression_starred_star_end_of_line_comment<'a>(
+    comment: DecoratedComment<'a>,
+    _locator: &Locator,
+) -> CommentPlacement<'a> {
+    if comment.line_position().is_own_line() || comment.following_node().is_none() {
+        return CommentPlacement::Default(comment);
+    }
+
+    let AnyNodeRef::ExprStarred(starred) = comment.enclosing_node() else {
+        return CommentPlacement::Default(comment);
+    };
+
+    CommentPlacement::leading(starred.as_any_node_ref(), comment)
+}
+
 /// Looks for a token in the range that contains no other tokens except for parentheses outside
 /// the expression ranges
 fn find_only_token_in_range(range: TextRange, locator: &Locator, token_kind: TokenKind) -> Token {

crates/ruff_python_formatter/src/comments/visitor.rs

@@ -454,6 +454,13 @@ impl<'a> DecoratedComment<'a> {
     }
 }
 
+impl Ranged for DecoratedComment<'_> {
+    #[inline]
+    fn range(&self) -> TextRange {
+        self.slice.range()
+    }
+}
+
 impl From<DecoratedComment<'_>> for SourceComment {
     fn from(decorated: DecoratedComment) -> Self {
         Self::new(decorated.slice, decorated.line_position)

crates/ruff_python_formatter/src/expression/expr_starred.rs

@@ -1,22 +1,32 @@
+use rustpython_parser::ast::ExprStarred;
+
+use ruff_formatter::write;
+
 use crate::comments::Comments;
 use crate::expression::parentheses::{
     default_expression_needs_parentheses, NeedsParentheses, Parentheses, Parenthesize,
 };
-use crate::{not_yet_implemented_custom_text, FormatNodeRule, PyFormatter};
-use ruff_formatter::{write, Buffer, FormatResult};
-use rustpython_parser::ast::ExprStarred;
+use crate::prelude::*;
+use crate::FormatNodeRule;
 
 #[derive(Default)]
 pub struct FormatExprStarred;
 
 impl FormatNodeRule<ExprStarred> for FormatExprStarred {
-    fn fmt_fields(&self, _item: &ExprStarred, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(
-            f,
-            [not_yet_implemented_custom_text(
-                "*NOT_YET_IMPLEMENTED_ExprStarred"
-            )]
-        )
+    fn fmt_fields(&self, item: &ExprStarred, f: &mut PyFormatter) -> FormatResult<()> {
+        let ExprStarred {
+            range: _,
+            value,
+            ctx: _,
+        } = item;
+
+        write!(f, [text("*"), value.format()])
+    }
+
+    fn fmt_dangling_comments(&self, node: &ExprStarred, f: &mut PyFormatter) -> FormatResult<()> {
+        debug_assert_eq!(f.context().comments().dangling_comments(node), []);
+
+        Ok(())
     }
 }
 

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

@@ -200,7 +200,7 @@ def f():
 +
 +##
 +
-+@decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
++@decorator(*args)
 +def f():
 +    ...
 +
@@ -216,7 +216,7 @@ def f():
  ##
  
 -@(decorator)
-+@decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
++@decorator(*args, **kwargs)
  def f():
      ...
  
@@ -225,7 +225,7 @@ def f():
  
 -@sequence["decorator"]
 +@decorator(
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
++    *args,
 +    **kwargs,
 +)
  def f():
@@ -257,7 +257,7 @@ def f():
 +
 +##
 +
-+@dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
++@dotted.decorator(*args)
 +def f():
 +    ...
 +
@@ -271,7 +271,7 @@ def f():
 +
 +##
 +
-+@dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
++@dotted.decorator(*args, **kwargs)
 +def f():
 +    ...
 +
@@ -279,7 +279,7 @@ def f():
 +##
 +
 +@dotted.decorator(
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
++    *args,
 +    **kwargs,
 +)
 +def f():
@@ -309,7 +309,7 @@ def f():
 +
 +##
 +
-+@double.dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
++@double.dotted.decorator(*args)
 +def f():
 +    ...
 +
@@ -323,7 +323,7 @@ def f():
 +
 +##
 +
-+@double.dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
++@double.dotted.decorator(*args, **kwargs)
 +def f():
 +    ...
 +
@@ -331,7 +331,7 @@ def f():
 +##
 +
 +@double.dotted.decorator(
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
++    *args,
 +    **kwargs,
 +)
 +def f():
@@ -392,7 +392,7 @@ def f():
 
 ##
 
-@decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
+@decorator(*args)
 def f():
     ...
 
@@ -406,7 +406,7 @@ def f():
 
 ##
 
-@decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
+@decorator(*args, **kwargs)
 def f():
     ...
 
@@ -414,7 +414,7 @@ def f():
 ##
 
 @decorator(
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *args,
     **kwargs,
 )
 def f():
@@ -444,7 +444,7 @@ def f():
 
 ##
 
-@dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
+@dotted.decorator(*args)
 def f():
     ...
 
@@ -458,7 +458,7 @@ def f():
 
 ##
 
-@dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
+@dotted.decorator(*args, **kwargs)
 def f():
     ...
 
@@ -466,7 +466,7 @@ def f():
 ##
 
 @dotted.decorator(
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *args,
     **kwargs,
 )
 def f():
@@ -496,7 +496,7 @@ def f():
 
 ##
 
-@double.dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred)
+@double.dotted.decorator(*args)
 def f():
     ...
 
@@ -510,7 +510,7 @@ def f():
 
 ##
 
-@double.dotted.decorator(*NOT_YET_IMPLEMENTED_ExprStarred, **kwargs)
+@double.dotted.decorator(*args, **kwargs)
 def f():
     ...
 
@@ -518,7 +518,7 @@ def f():
 ##
 
 @double.dotted.decorator(
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *args,
     **kwargs,
 )
 def f():

crates/ruff_python_formatter/tests/snapshots/black_compatibility@py_310__starred_for_target.py.snap

@@ -39,21 +39,8 @@ async for x in (
 ```diff
 --- Black
 +++ Ruff
-@@ -1,27 +1,19 @@
--for x in *a, *b:
-+for x in *NOT_YET_IMPLEMENTED_ExprStarred, *NOT_YET_IMPLEMENTED_ExprStarred:
-     print(x)
- 
--for x in a, b, *c:
-+for x in a, b, *NOT_YET_IMPLEMENTED_ExprStarred:
-     print(x)
- 
--for x in *a, b, c:
-+for x in *NOT_YET_IMPLEMENTED_ExprStarred, b, c:
-     print(x)
- 
--for x in *a, b, *c:
-+for x in *NOT_YET_IMPLEMENTED_ExprStarred, b, *NOT_YET_IMPLEMENTED_ExprStarred:
+@@ -10,18 +10,10 @@
+ for x in *a, b, *c:
      print(x)
  
 -async for x in *a, *b:
@@ -80,16 +67,16 @@ async for x in (
 ## Ruff Output
 
 ```py
-for x in *NOT_YET_IMPLEMENTED_ExprStarred, *NOT_YET_IMPLEMENTED_ExprStarred:
+for x in *a, *b:
     print(x)
 
-for x in a, b, *NOT_YET_IMPLEMENTED_ExprStarred:
+for x in a, b, *c:
     print(x)
 
-for x in *NOT_YET_IMPLEMENTED_ExprStarred, b, c:
+for x in *a, b, c:
     print(x)
 
-for x in *NOT_YET_IMPLEMENTED_ExprStarred, b, *NOT_YET_IMPLEMENTED_ExprStarred:
+for x in *a, b, *c:
     print(x)
 
 NOT_YET_IMPLEMENTED_StmtAsyncFor

crates/ruff_python_formatter/tests/snapshots/black_compatibility@py_311__pep_654.py.snap

@@ -1,240 +0,0 @@
----
-source: crates/ruff_python_formatter/tests/fixtures.rs
-input_file: crates/ruff_python_formatter/resources/test/fixtures/black/py_311/pep_654.py
----
-## Input
-
-```py
-try:
-    raise OSError("blah")
-except* ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except* ValueError:
-    pass
-
-try:
-    try:
-        raise ValueError(42)
-    except:
-        try:
-            raise TypeError(int)
-        except* Exception:
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-    except* TypeError as e:
-        tes = e
-        raise
-    except* ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* (TypeError, ValueError) as e:
-        raise SyntaxError(3) from e
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* OSError as e:
-        raise TypeError(3) from e
-except ExceptionGroup as e:
-    exc = e
-```
-
-## Black Differences
-
-```diff
---- Black
-+++ Ruff
-@@ -1,5 +1,5 @@
- try:
--    raise OSError("blah")
-+    NOT_YET_IMPLEMENTED_StmtRaise
- except* ExceptionGroup as e:
-     pass
- 
-@@ -14,10 +14,10 @@
- 
- try:
-     try:
--        raise ValueError(42)
-+        NOT_YET_IMPLEMENTED_StmtRaise
-     except:
-         try:
--            raise TypeError(int)
-+            NOT_YET_IMPLEMENTED_StmtRaise
-         except* Exception:
-             pass
-         1 / 0
-@@ -26,10 +26,10 @@
- 
- try:
-     try:
--        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-+        NOT_YET_IMPLEMENTED_StmtRaise
-     except* TypeError as e:
-         tes = e
--        raise
-+        NOT_YET_IMPLEMENTED_StmtRaise
-     except* ValueError as e:
-         ves = e
-         pass
-@@ -38,16 +38,16 @@
- 
- try:
-     try:
--        raise orig
-+        NOT_YET_IMPLEMENTED_StmtRaise
-     except* (TypeError, ValueError) as e:
--        raise SyntaxError(3) from e
-+        NOT_YET_IMPLEMENTED_StmtRaise
- except BaseException as e:
-     exc = e
- 
- try:
-     try:
--        raise orig
-+        NOT_YET_IMPLEMENTED_StmtRaise
-     except* OSError as e:
--        raise TypeError(3) from e
-+        NOT_YET_IMPLEMENTED_StmtRaise
- except ExceptionGroup as e:
-     exc = e
-```
-
-## Ruff Output
-
-```py
-try:
-    NOT_YET_IMPLEMENTED_StmtRaise
-except* ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except* ValueError:
-    pass
-
-try:
-    try:
-        NOT_YET_IMPLEMENTED_StmtRaise
-    except:
-        try:
-            NOT_YET_IMPLEMENTED_StmtRaise
-        except* Exception:
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        NOT_YET_IMPLEMENTED_StmtRaise
-    except* TypeError as e:
-        tes = e
-        NOT_YET_IMPLEMENTED_StmtRaise
-    except* ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        NOT_YET_IMPLEMENTED_StmtRaise
-    except* (TypeError, ValueError) as e:
-        NOT_YET_IMPLEMENTED_StmtRaise
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        NOT_YET_IMPLEMENTED_StmtRaise
-    except* OSError as e:
-        NOT_YET_IMPLEMENTED_StmtRaise
-except ExceptionGroup as e:
-    exc = e
-```
-
-## Black Output
-
-```py
-try:
-    raise OSError("blah")
-except* ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except* ValueError:
-    pass
-
-try:
-    try:
-        raise ValueError(42)
-    except:
-        try:
-            raise TypeError(int)
-        except* Exception:
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-    except* TypeError as e:
-        tes = e
-        raise
-    except* ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* (TypeError, ValueError) as e:
-        raise SyntaxError(3) from e
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* OSError as e:
-        raise TypeError(3) from e
-except ExceptionGroup as e:
-    exc = e
-```
-
-

crates/ruff_python_formatter/tests/snapshots/black_compatibility@py_311__pep_654_style.py.snap

@@ -1,197 +0,0 @@
----
-source: crates/ruff_python_formatter/tests/fixtures.rs
-input_file: crates/ruff_python_formatter/resources/test/fixtures/black/py_311/pep_654_style.py
----
-## Input
-
-```py
-try:
-    raise OSError("blah")
-except               * ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except *ValueError:
-    pass
-
-try:
-    try:
-        raise ValueError(42)
-    except:
-        try:
-            raise TypeError(int)
-        except *(Exception):
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-    except \
-        *TypeError as e:
-        tes = e
-        raise
-    except  *  ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except *(TypeError, ValueError, *OTHER_EXCEPTIONS) as e:
-        raise SyntaxError(3) from e
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except\
-        * OSError as e:
-        raise TypeError(3) from e
-except ExceptionGroup as e:
-    exc = e
-```
-
-## Black Differences
-
-```diff
---- Black
-+++ Ruff
-@@ -39,7 +39,7 @@
- try:
-     try:
-         raise orig
--    except* (TypeError, ValueError, *OTHER_EXCEPTIONS) as e:
-+    except* (TypeError, ValueError, *NOT_YET_IMPLEMENTED_ExprStarred) as e:
-         raise SyntaxError(3) from e
- except BaseException as e:
-     exc = e
-```
-
-## Ruff Output
-
-```py
-try:
-    raise OSError("blah")
-except* ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except* ValueError:
-    pass
-
-try:
-    try:
-        raise ValueError(42)
-    except:
-        try:
-            raise TypeError(int)
-        except* Exception:
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-    except* TypeError as e:
-        tes = e
-        raise
-    except* ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* (TypeError, ValueError, *NOT_YET_IMPLEMENTED_ExprStarred) as e:
-        raise SyntaxError(3) from e
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* OSError as e:
-        raise TypeError(3) from e
-except ExceptionGroup as e:
-    exc = e
-```
-
-## Black Output
-
-```py
-try:
-    raise OSError("blah")
-except* ExceptionGroup as e:
-    pass
-
-
-try:
-    async with trio.open_nursery() as nursery:
-        # Make two concurrent calls to child()
-        nursery.start_soon(child)
-        nursery.start_soon(child)
-except* ValueError:
-    pass
-
-try:
-    try:
-        raise ValueError(42)
-    except:
-        try:
-            raise TypeError(int)
-        except* Exception:
-            pass
-        1 / 0
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise FalsyEG("eg", [TypeError(1), ValueError(2)])
-    except* TypeError as e:
-        tes = e
-        raise
-    except* ValueError as e:
-        ves = e
-        pass
-except Exception as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* (TypeError, ValueError, *OTHER_EXCEPTIONS) as e:
-        raise SyntaxError(3) from e
-except BaseException as e:
-    exc = e
-
-try:
-    try:
-        raise orig
-    except* OSError as e:
-        raise TypeError(3) from e
-except ExceptionGroup as e:
-    exc = e
-```
-
-

crates/ruff_python_formatter/tests/snapshots/black_compatibility@py_38__pep_572.py.snap

@@ -72,7 +72,7 @@ while x := f(x):
  (y := f(x))
  y0 = (y1 := f(x))
  foo(x=(y := f(x)))
-@@ -19,29 +19,29 @@
+@@ -19,10 +19,10 @@
      pass
  
  
@@ -86,10 +86,8 @@ while x := f(x):
 +lambda x: True
  x = (y := 0)
  (z := (y := (x := 0)))
--(info := (name, phone, *rest))
-+(info := (name, phone, *NOT_YET_IMPLEMENTED_ExprStarred))
- (x := 1, 2)
- (total := total + tax)
+ (info := (name, phone, *rest))
+@@ -31,17 +31,17 @@
  len(lines := f.readlines())
  foo(x := 3, cat="vector")
  foo(cat=(category := "vector"))
@@ -144,7 +142,7 @@ lambda x: True
 lambda x: True
 x = (y := 0)
 (z := (y := (x := 0)))
-(info := (name, phone, *NOT_YET_IMPLEMENTED_ExprStarred))
+(info := (name, phone, *rest))
 (x := 1, 2)
 (total := total + tax)
 len(lines := f.readlines())

crates/ruff_python_formatter/tests/snapshots/black_compatibility@py_38__python38.py.snap

@@ -31,13 +31,7 @@ def t():
 ```diff
 --- Black
 +++ Ruff
-@@ -3,19 +3,19 @@
- 
- def starred_return():
-     my_list = ["value2", "value3"]
--    return "value1", *my_list
-+    return "value1", *NOT_YET_IMPLEMENTED_ExprStarred
- 
+@@ -8,14 +8,14 @@
  
  def starred_yield():
      my_list = ["value2", "value3"]
@@ -66,7 +60,7 @@ def t():
 
 def starred_return():
     my_list = ["value2", "value3"]
-    return "value1", *NOT_YET_IMPLEMENTED_ExprStarred
+    return "value1", *my_list
 
 
 def starred_yield():

crates/ruff_python_formatter/tests/snapshots/black_compatibility@simple_cases__comments6.py.snap

@@ -141,7 +141,7 @@ aaaaaaaaaaaaa, bbbbbbbbb = map(list, map(itertools.chain.from_iterable, zip(*ite
      an_element_with_a_long_value = calls() or more_calls() and more()  # type: bool
  
      tup = (
-@@ -100,19 +98,32 @@
+@@ -100,19 +98,30 @@
      )
  
      c = call(
@@ -177,10 +177,7 @@ aaaaaaaaaaaaa, bbbbbbbbb = map(list, map(itertools.chain.from_iterable, zip(*ite
 +    ],  # type: ignore
  )
  
--aaaaaaaaaaaaa, bbbbbbbbb = map(list, map(itertools.chain.from_iterable, zip(*items)))  # type: ignore[arg-type]
-+aaaaaaaaaaaaa, bbbbbbbbb = map(
-+    list, map(itertools.chain.from_iterable, zip(*NOT_YET_IMPLEMENTED_ExprStarred))
-+)  # type: ignore[arg-type]
+ aaaaaaaaaaaaa, bbbbbbbbb = map(list, map(itertools.chain.from_iterable, zip(*items)))  # type: ignore[arg-type]
 ```
 
 ## Ruff Output
@@ -312,9 +309,7 @@ call_to_some_function_asdf(
     ],  # type: ignore
 )
 
-aaaaaaaaaaaaa, bbbbbbbbb = map(
-    list, map(itertools.chain.from_iterable, zip(*NOT_YET_IMPLEMENTED_ExprStarred))
-)  # type: ignore[arg-type]
+aaaaaaaaaaaaa, bbbbbbbbb = map(list, map(itertools.chain.from_iterable, zip(*items)))  # type: ignore[arg-type]
 ```
 
 ## Black Output

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

@@ -316,32 +316,9 @@ last_call()
  ()
  (1,)
  (1, 2)
-@@ -69,40 +72,37 @@
-     2,
-     3,
- ]
--[*a]
--[*range(10)]
-+[*NOT_YET_IMPLEMENTED_ExprStarred]
-+[*NOT_YET_IMPLEMENTED_ExprStarred]
- [
--    *a,
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
-     4,
-     5,
- ]
- [
-     4,
--    *a,
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
-     5,
- ]
- [
-     this_is_a_very_long_variable_which_will_force_a_delimiter_split,
-     element,
+@@ -87,22 +90,19 @@
      another,
--    *more,
-+    *NOT_YET_IMPLEMENTED_ExprStarred,
+     *more,
  ]
 -{i for i in (1, 2, 3)}
 -{(i**2) for i in (1, 2, 3)}
@@ -375,20 +352,15 @@ last_call()
  Python3 > Python2 > COBOL
  Life is Life
  call()
-@@ -115,10 +115,10 @@
+@@ -115,7 +115,7 @@
      arg,
      another,
      kwarg="hey",
 -    **kwargs
 +    **kwargs,
  )  # note: no trailing comma pre-3.6
--call(*gidgets[:2])
--call(a, *gidgets[:2])
-+call(*NOT_YET_IMPLEMENTED_ExprStarred)
-+call(a, *NOT_YET_IMPLEMENTED_ExprStarred)
- call(**self.screen_kwargs)
- call(b, **self.screen_kwargs)
- lukasz.langa.pl
+ call(*gidgets[:2])
+ call(a, *gidgets[:2])
 @@ -131,34 +131,28 @@
  tuple[str, ...]
  tuple[str, int, float, dict[str, int]]
@@ -397,6 +369,9 @@ last_call()
 -    int,
 -    float,
 -    dict[str, int],
+-]
+-very_long_variable_name_filters: t.List[
+-    t.Tuple[str, t.Union[str, t.List[t.Optional[str]]]],
 +    (
 +        str,
 +        int,
@@ -404,9 +379,6 @@ last_call()
 +        dict[str, int],
 +    )
  ]
--very_long_variable_name_filters: t.List[
--    t.Tuple[str, t.Union[str, t.List[t.Optional[str]]]],
--]
 -xxxx_xxxxx_xxxx_xxx: Callable[..., List[SomeClass]] = classmethod(  # type: ignore
 -    sync(async_xxxx_xxx_xxxx_xxxxx_xxxx_xxx.__func__)
 -)
@@ -446,7 +418,7 @@ last_call()
  numpy[np.newaxis, :]
  (str or None) if (sys.version_info[0] > (3,)) else (str or bytes or None)
  {"2.7": dead, "3.7": long_live or die_hard}
-@@ -181,11 +175,11 @@
+@@ -181,10 +175,10 @@
  (SomeName)
  SomeName
  (Good, Bad, Ugly)
@@ -454,26 +426,14 @@ last_call()
 -((i**2) for i in (1, 2, 3))
 -((i**2) for i, _ in ((1, "a"), (2, "b"), (3, "c")))
 -(((i**2) + j) for i in (1, 2, 3) for j in (1, 2, 3))
--(*starred,)
 +(NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
 +(NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
 +(NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
 +(NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
-+(*NOT_YET_IMPLEMENTED_ExprStarred,)
+ (*starred,)
  {
      "id": "1",
-     "type": "type",
-@@ -200,32 +194,22 @@
- c = 1
- d = (1,) + a + (2,)
- e = (1,).count(1)
--f = 1, *range(10)
--g = 1, *"ten"
-+f = 1, *NOT_YET_IMPLEMENTED_ExprStarred
-+g = 1, *NOT_YET_IMPLEMENTED_ExprStarred
- what_is_up_with_those_new_coord_names = (coord_names + set(vars_to_create)) + set(
-     vars_to_remove
- )
+@@ -208,24 +202,14 @@
  what_is_up_with_those_new_coord_names = (coord_names | set(vars_to_create)) - set(
      vars_to_remove
  )
@@ -506,7 +466,7 @@ last_call()
  Ø = set()
  authors.łukasz.say_thanks()
  mapping = {
-@@ -237,29 +221,33 @@
+@@ -237,10 +221,10 @@
  
  
  def gen():
@@ -521,10 +481,10 @@ last_call()
  
  
  async def f():
-     await some.complicated[0].call(with_args=(True or (1 is not 1)))
+@@ -248,18 +232,22 @@
  
  
--print(*[] or [1])
+ 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"
@@ -532,13 +492,12 @@ last_call()
 -    force=False
 -), "Short message"
 -assert parens is TooMany
-+print(*NOT_YET_IMPLEMENTED_ExprStarred)
 +print(
 +    **{1: 3}
 +    if False
 +    else {NOT_IMPLEMENTED_dict_key: NOT_IMPLEMENTED_dict_value for key, value in NOT_IMPLEMENTED_dict}
 +)
-+print(*NOT_YET_IMPLEMENTED_ExprStarred)
++print(*lambda x: True)
 +NOT_YET_IMPLEMENTED_StmtAssert
 +NOT_YET_IMPLEMENTED_StmtAssert
 +NOT_YET_IMPLEMENTED_StmtAssert
@@ -664,23 +623,23 @@ str or None if (1 if True else 2) else str or bytes or None
     2,
     3,
 ]
-[*NOT_YET_IMPLEMENTED_ExprStarred]
-[*NOT_YET_IMPLEMENTED_ExprStarred]
+[*a]
+[*range(10)]
 [
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *a,
     4,
     5,
 ]
 [
     4,
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *a,
     5,
 ]
 [
     this_is_a_very_long_variable_which_will_force_a_delimiter_split,
     element,
     another,
-    *NOT_YET_IMPLEMENTED_ExprStarred,
+    *more,
 ]
 {NOT_IMPLEMENTED_set_value for value in NOT_IMPLEMENTED_set}
 {NOT_IMPLEMENTED_set_value for value in NOT_IMPLEMENTED_set}
@@ -709,8 +668,8 @@ call(
     kwarg="hey",
     **kwargs,
 )  # note: no trailing comma pre-3.6
-call(*NOT_YET_IMPLEMENTED_ExprStarred)
-call(a, *NOT_YET_IMPLEMENTED_ExprStarred)
+call(*gidgets[:2])
+call(a, *gidgets[:2])
 call(**self.screen_kwargs)
 call(b, **self.screen_kwargs)
 lukasz.langa.pl
@@ -771,7 +730,7 @@ SomeName
 (NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
 (NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
 (NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in [])
-(*NOT_YET_IMPLEMENTED_ExprStarred,)
+(*starred,)
 {
     "id": "1",
     "type": "type",
@@ -786,8 +745,8 @@ b = (1,)
 c = 1
 d = (1,) + a + (2,)
 e = (1,).count(1)
-f = 1, *NOT_YET_IMPLEMENTED_ExprStarred
-g = 1, *NOT_YET_IMPLEMENTED_ExprStarred
+f = 1, *range(10)
+g = 1, *"ten"
 what_is_up_with_those_new_coord_names = (coord_names + set(vars_to_create)) + set(
     vars_to_remove
 )
@@ -823,13 +782,13 @@ async def f():
     await some.complicated[0].call(with_args=(True or (1 is not 1)))
 
 
-print(*NOT_YET_IMPLEMENTED_ExprStarred)
+print(*[] or [1])
 print(
     **{1: 3}
     if False
     else {NOT_IMPLEMENTED_dict_key: NOT_IMPLEMENTED_dict_value for key, value in NOT_IMPLEMENTED_dict}
 )
-print(*NOT_YET_IMPLEMENTED_ExprStarred)
+print(*lambda x: True)
 NOT_YET_IMPLEMENTED_StmtAssert
 NOT_YET_IMPLEMENTED_StmtAssert
 NOT_YET_IMPLEMENTED_StmtAssert

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

@@ -316,7 +316,7 @@ d={'a':1,
      # fmt: off
 -    a , b = *hello
 -    'unformatted'
-+    a, b = *NOT_YET_IMPLEMENTED_ExprStarred
++    a, b = *hello
 +    "unformatted"
      # fmt: on
  
@@ -507,7 +507,7 @@ def import_as_names():
 
 def testlist_star_expr():
     # fmt: off
-    a, b = *NOT_YET_IMPLEMENTED_ExprStarred
+    a, b = *hello
     "unformatted"
     # fmt: on
 

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

@@ -0,0 +1,61 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/starred.py
+---
+## Input
+```py
+call(
+    # Leading starred comment
+    * # Trailing star comment
+    [
+        # Leading value commnt
+        [What, i, this, s, very, long, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa]
+    ] # trailing value comment
+)
+
+call(
+    # Leading starred comment
+    * ( # Leading value commnt
+        [What, i, this, s, very, long, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa]
+    ) # trailing value comment
+)
+```
+
+## Output
+```py
+call(
+    # Leading starred comment
+    # Trailing star comment
+    *[
+        # Leading value commnt
+        [
+            What,
+            i,
+            this,
+            s,
+            very,
+            long,
+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
+        ]
+    ]  # trailing value comment
+)
+
+call(
+    # Leading starred comment
+    # Leading value commnt
+    *(
+        [
+            What,
+            i,
+            this,
+            s,
+            very,
+            long,
+            aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
+        ]
+    )  # trailing value comment
+)
+```
+
+
+

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

@@ -121,7 +121,7 @@ with (
 # currently unparsable by black: https://github.com/psf/black/issues/3678
 with (NOT_YET_IMPLEMENTED_generator_key for NOT_YET_IMPLEMENTED_generator_key in []):
     pass
-with (a, *NOT_YET_IMPLEMENTED_ExprStarred):
+with (a, *b):
     pass
 ```