lib/ruby_parser.yy in ruby_parser-3.16.0 vs lib/ruby_parser.yy in ruby_parser-3.17.0

@@ -1064,11 +1064,31 @@
       paren_args: tLPAREN2 opt_call_args rparen
                     {
                       _, args, _ = val
                       result = args
                     }
+#if V >= 27
+                | tLPAREN2 args tCOMMA args_forward rparen
+                    {
+                      yyerror "Unexpected ..." unless
+                        self.lexer.is_local_id(:"*")  &&
+                        self.lexer.is_local_id(:"**") &&
+                        self.lexer.is_local_id(:"&")
 
+                      result = call_args val
+                    }
+                | tLPAREN2 args_forward rparen
+                    {
+                      yyerror "Unexpected ..." unless
+                        self.lexer.is_local_id(:"*")  &&
+                        self.lexer.is_local_id(:"**") &&
+                        self.lexer.is_local_id(:"&")
+
+                      result = call_args val
+                    }
+#endif
+
   opt_paren_args: none
                 | paren_args
 
    opt_call_args: none
                 | call_args
@@ -2364,10 +2384,26 @@
                     {
                       result = val[1]
                       self.lexer.lex_state = EXPR_BEG
                       self.lexer.command_start = true
                     }
+#if V >= 27
+                | tLPAREN2 f_arg tCOMMA args_forward rparen
+                    {
+                      result = args val
+
+                      self.lexer.lex_state = EXPR_BEG
+                      self.lexer.command_start = true
+                    }
+                | tLPAREN2 args_forward rparen
+                    {
+                      result = args val
+
+                      self.lexer.lex_state = EXPR_BEG
+                      self.lexer.command_start = true
+                    }
+#endif
                 |   {
                       result = self.in_kwarg
                       self.in_kwarg = true
                       self.lexer.lex_state |= EXPR_LABEL
                     }
@@ -2463,10 +2499,17 @@
                 |
                     {
                       result = args val
                     }
 
+#if V >= 27
+    args_forward: tBDOT3
+                    {
+                      result = s(:forward_args).line lexer.lineno
+                    }
+#endif
+
        f_bad_arg: tCONSTANT
                     {
                       yyerror "formal argument cannot be a constant"
                     }
                 | tIVAR
@@ -2611,9 +2654,10 @@
                       result = :"**#{name}"
                     }
                 | kwrest_mark
                     {
                       result = :"**"
+                      self.env[result] = :lvar
                     }
 
 #if V == 20
            f_opt: tIDENTIFIER tEQL arg_value
 #elif V == 21