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Merge "Use std::optional instead of std::unique_ptr"
authorJooyung Han <jooyung@google.com>
Sat, 21 Nov 2020 00:45:44 +0000 (00:45 +0000)
committerGerrit Code Review <noreply-gerritcodereview@google.com>
Sat, 21 Nov 2020 00:45:44 +0000 (00:45 +0000)

Trivial merge