1 files changed, 6 insertions, 0 deletions
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 85d5b2cdfe..fe271dc3d7 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -156,6 +156,10 @@ class TestRegexp < Test::Unit::TestCase
     s = "foo"
     s[/(?<bar>o)/, "bar"] = "baz"
     assert_equal("fbazo", s)
+
+    /.*/ =~ "abc"
+    "a".sub("a", "")
+    assert_raise(IndexError) {Regexp.last_match(:_id)}
   end
 
   def test_named_capture_with_nul
@@ -955,6 +959,8 @@ class TestRegexp < Test::Unit::TestCase
     assert_match /\A\X\z/, "\u{1F468 200D 1F393}"
     assert_match /\A\X\z/, "\u{1F46F 200D 2642 FE0F}"
     assert_match /\A\X\z/, "\u{1f469 200d 2764 fe0f 200d 1f469}"
+
+    assert_warning('') {/\X/ =~ "\u{a0}"}
   end
 
   def test_backward