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-rw-r--r--bootstraptest/test_knownbug.rb9
1 files changed, 9 insertions, 0 deletions
diff --git a/bootstraptest/test_knownbug.rb b/bootstraptest/test_knownbug.rb
index b189f8beb5..710331427a 100644
--- a/bootstraptest/test_knownbug.rb
+++ b/bootstraptest/test_knownbug.rb
@@ -15,3 +15,12 @@ ensure
r.close
end
}, 'rename test/ruby/test_io.rb#_test_ungetc if fixed'
+
+assert_equal 'ok', %q{
+ class C
+ undef display
+ remove_method :display
+ end
+ :ok
+}, '[ruby-dev:31816]'
+