diff --git a/ChangeLog b/ChangeLog
index 6d60b2dc71..dab135106e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Apr 23 04:11:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/ripper/test_parser_events.rb (test_unterminated_regexp):
+	  separate test.
+
 Fri Apr 23 01:47:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (rb_w32_wopen): shouldn't use FILE_FLAG_OVERLAPPED with
diff --git a/test/ripper/test_parser_events.rb b/test/ripper/test_parser_events.rb
index c07fc4a01e..527c29023f 100644
--- a/test/ripper/test_parser_events.rb
+++ b/test/ripper/test_parser_events.rb
@@ -154,7 +154,7 @@ class TestRipper::ParserEvents < Test::Unit::TestCase
 
   def test_operator_ambiguous
     thru_operator_ambiguous = false
-    parse('a=1; a //', :on_operator_ambiguous) {thru_operator_ambiguous = true}
+    parse('a=1; a %[]', :on_operator_ambiguous) {thru_operator_ambiguous = true}
     assert_equal true, thru_operator_ambiguous
   end
 
@@ -1088,4 +1088,12 @@ class TestRipper::ParserEvents < Test::Unit::TestCase
                         ["[fcall(proc,[],&block([],[void()]))]"], [], '[ruby-dev:39423]')
     end
   end
+
+  def test_unterminated_regexp
+    assert_normal_exit(<<"SRC")
+$:.unshift(File.dirname(#{File.expand_path(__FILE__).dump}))
+require 'dummyparser'
+DummyParser.new('/').parse.to_s
+SRC
+  end
 end if ripper_test