After we build as C++17 by default, we can replace `MOZ_MUST_USE` with C++17 `[[nodiscard]]. https://en.cppreference.com/w/cpp/language/attributes/nodiscard
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After we build as C++17 by default, we can replace `MOZ_MUST_USE` with C++17 `[[nodiscard]]`. https://en.cppreference.com/w/cpp/language/attributes/nodiscard