1 files changed, 12 insertions, 0 deletions
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 4d94702502..77e9ca67f6 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -72,6 +72,18 @@ class TestRegexp < Test::Unit::TestCase
     end
   end
 
+  def test_to_s_under_gc_compact_stress
+    EnvUtil.under_gc_compact_stress do
+      str = "abcd\u3042"
+      [:UTF_16BE, :UTF_16LE, :UTF_32BE, :UTF_32LE].each do |es|
+        enc = Encoding.const_get(es)
+        rs = Regexp.new(str.encode(enc)).to_s
+        assert_equal("(?-mix:abcd\u3042)".encode(enc), rs)
+        assert_equal(enc, rs.encoding)
+      end
+    end
+  end
+
   def test_to_s_extended_subexp
     re = /#\g#{"\n"}/x
     re = /#{re}/