test_parser_events.rb: suppress a warning

* test/ripper/test_parser_events.rb (test_warn_cr_in_middle):
  remove unused variable to suppress assigned-but-unused-variable
  warning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52765 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ripper/test_parser_events.rb

@@ -1323,7 +1323,7 @@ class TestRipper::ParserEvents < Test::Unit::TestCase
 
   def test_warn_cr_in_middle
     fmt = nil
-    assert_warn("") {fmt, *args = warn("\r;")}
+    assert_warn("") {fmt, = warn("\r;")}
     assert_match(/encountered/, fmt)
   end
 end if ripper_test