ripper: add kwrest_param parser event

* parse.y (f_kwrest): Dispatch kwrest_param event. This is especially
  useful for unnamed kwrest parameter for which we expose the internal
  ID currently.  [ruby-core:75528] [Feature #12387]

* test/ripper/dummyparser.rb (on_kwrest_param): Add handler for
  kwrest_param parser event.

* test/ripper/test_parser_events.rb (test_params): Adapt to the change
  in DummyParser.
  (test_kwrest_param): Test that kwrest_param event handler is called.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 58cec8961d..0a1910e880 100644
--- a/parse.y
+++ b/parse.y
@@ -4492,12 +4492,20 @@ kwrest_mark	: tPOW
 f_kwrest	: kwrest_mark tIDENTIFIER
 		    {
 			shadowing_lvar(get_id($2));
+		    /*%%%*/
 			$$ = $2;
+		    /*%
+			$$ = dispatch1(kwrest_param, $2);
+		    %*/
 		    }
 		| kwrest_mark
 		    {
+		    /*%%%*/
 			$$ = internal_id();
 			arg_var($$);
+		    /*%
+			$$ = dispatch1(kwrest_param, Qnil);
+		    %*/
 		    }
 		;