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, 4 insertions, 0 deletions

diff --git a/test/ripper/dummyparser.rb b/test/ripper/dummyparser.rb
index 6de7e19013..4261ab5e82 100644
--- a/test/ripper/dummyparser.rb
+++ b/test/ripper/dummyparser.rb
@@ -153,6 +153,10 @@ class DummyParser < Ripper
     "*#{var}"
   end
 
+  def on_kwrest_param(var)
+    "**#{var}"
+  end
+
   def on_blockarg(var)
     "&#{var}"
   end