Mike McQuaid 86f43f79ee
Enable/fix optional Ruby frozen string literal usage
Combined with https://github.com/Homebrew/homebrew-test-bot/pull/247
this will test Homebrew's use of frozen strings in CI. After this we
will then enable it for Homebrew developers and eventually all Homebrew
users.
2019-04-19 10:30:41 +09:00
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