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Not along after 1b830740ba8371c4bcfdfc6eb2cb7e0ae81a84e0 CI started to rarely fail this test: ``` TestString#test_uplus_minus: Test::Unit::AssertionFailedError: uminus deduplicates [Feature #13077]. 1) Failure: TestString#test_uplus_minus [/tmp/ruby/src/trunk/test/ruby/test_string.rb:3368]: ``` It's unclear what is going on, but one possibility is that `"bar".freeze` might no longer compile correctly. Another possibility is that another test redefine `String#freeze`, causing `opt_str_freeze` to no longer return an `fstring`.