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rintaro 7/24/2018 6:57 AM
https://github.com/apple/swift/pull/17767 unowned が Optional を保持できるようになるそうで。これは嬉しい！
Enable optional unowned/unowned(unsafe) references by davezarzycki...
@rjmccall okayed this change in a comment on GitHub pull request: #16237
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