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The format! idiom notes:
It is possible to build up strings using the push and push_str methods on a mutable String, or using its + operator. However, it is often more convenient to use format!, especially where there is a mix of literal and non-literal strings.
Using write! on a String may not be quite as terse as the latter or as efficient as the former, but it's a pretty good (and generally more readable) alternative. It does require having std::fmt::Write in scope.