parse.y: rewrite excessed_comma process

Currently, parser.y includes core parser and Ripper parser obscurity.
In addition, *some* Ripper code uses the result of the core parser,
which make it difficult to separate the two parsers.

I want to simplify this, not by separating the two parsers, but by
making *all* Ripper actions follows the core parser actions.
In other words, all the core parser actions run always even in Ripper,
and after that, Ripper-specific actions run.

For tha sake, in principle, I want to put `/*% ripper: ... %*/` in the
end of actions.
Anyway, it is too dirty to put it within expressions, IMO.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61990 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -2908,16 +2908,12 @@ block_param	: f_arg ',' f_block_optarg ',' f_rest_arg opt_block_args_tail
 		    }
 		| f_arg ','
 		    {
-#ifndef RIPPER
+		    /*%%%*/
 			/* magic number for rest_id in iseq_set_arguments() */
 			const ID excessed_comma = 1;
-#else
-			const VALUE excessed_comma =
-			    /*% ripper: excessed_comma! %*/
-			    ;
-#endif
-			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@1);
-			$$ = new_args(p, $1, Qnone, excessed_comma, Qnone, $$, &@$);
+			$$ = new_args(p, $1, Qnone, excessed_comma, Qnone, new_args_tail(p, Qnone, Qnone, Qnone, &@1), &@$);
+		    /*% %*/
+		    /*% ripper: new_args(p, $1, Qnone, excessed_comma!, Qnone, new_args_tail(p, Qnone, Qnone, Qnone, NULL), NULL) %*/
 		    }
 		| f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail
 		    {