fix: remove ast.MatchStar.name class-level default value

Author: hunterhogan

Lib/ast.py

@@ -155,8 +155,8 @@ def _format(node, level=0):
                     not show_empty
                     and (value is None or value == [])
                     # Special cases:
-                    # `Constant(value=None)` and `MatchSingleton(value=None)`
-                    and not isinstance(node, (Constant, MatchSingleton))
+                    # `Constant(value=None)` and `MatchSingleton(value=None)` and `MatchStar(name=None)`
+                    and not isinstance(node, (Constant, MatchSingleton, MatchStar))
                 ):
                     args_buffer.append(repr(value))
                     continue

Parser/Python.asdl

@@ -135,7 +135,7 @@ module Python
             | MatchMapping(expr* keys, pattern* patterns, identifier? rest)
             | MatchClass(expr cls, pattern* patterns, identifier* kwd_attrs, pattern* kwd_patterns)
 
-            | MatchStar(identifier? name)
+            | MatchStar(identifier name)
             -- The optional "rest" MatchMapping parameter handles capturing extra mapping keys
 
             | MatchAs(pattern? pattern, identifier? name)