merge partially d292a9b98ce03c76dbe13138d20b9fbf613cc02d. Just add the test to ensure the issue doesn't exit in ruby_3_2 branch.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 873b5a04d8..b385760b42 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -1714,6 +1714,17 @@ class TestRegexp < Test::Unit::TestCase
     end;
   end
 
+  def test_bug_20453
+    assert_separately([], "#{<<-"begin;"}\n#{<<-'end;'}")
+    begin;
+      Regexp.timeout = 0.001
+
+      assert_raise(Regexp::TimeoutError) do
+        /^(a*)x$/ =~ "a" * 1000000 + "x"
+      end
+    end;
+  end
+
   def per_instance_redos_test(global_timeout, per_instance_timeout, expected_timeout)
     assert_separately([], "#{<<-"begin;"}\n#{<<-'end;'}")
       global_timeout = #{ EnvUtil.apply_timeout_scale(global_timeout).inspect }