1 files changed, 7 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index e04152f845..3d2d551a30 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -2103,6 +2103,13 @@ class TestModule < Test::Unit::TestCase
     assert_raise_with_message(TypeError, "#{n} is not a module") {
       m.module_eval "module #{n}; end"
     }
+
+    assert_separately([], <<-"end;")
+      Etc = (class C\u{1f5ff}; self; end).new
+      assert_raise_with_message(TypeError, /C\u{1f5ff}/) {
+        require 'etc'
+      }
+    end;
   end
 
   private