1 files changed, 12 insertions, 0 deletions
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index be563dfa52..6973e21c7a 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -711,6 +711,18 @@ class TestRegexp < Test::Unit::TestCase
     }
   end
 
+  def test_match_no_match_no_matchdata
+    EnvUtil.without_gc do
+      h = {}
+      ObjectSpace.count_objects(h)
+      prev_matches = h[:T_MATCH] || 0
+      md = /[A-Z]/.match('1') # no match
+      ObjectSpace.count_objects(h)
+      new_matches = h[:T_MATCH] || 0
+      assert_equal prev_matches, new_matches, "Bug [#20104]"
+    end
+  end
+
   def test_initialize
     assert_raise(ArgumentError) { Regexp.new }
     assert_equal(/foo/, assert_warning(/ignored/) {Regexp.new(/foo/, Regexp::IGNORECASE)})