[Question] mem::swap with temporary value about cs431 HOT 3 CLOSED

Yes you are correct.

mem::swap(&mut s, &mut String::("temp string"))
                       ^^^^^^^^^^^^^^^^^^^^^^  - and dropped here
                       |
                       temporary variable is allocated here (with usual allocator function)

See a related compiler message that might give you insight on how lifetime of temporary variables are treated in Rust.
https://users.rust-lang.org/t/rust-and-strings-what-is-the-deal-with-temporary-value-dropped-while-borrowed/98424

Another resource: https://doc.rust-lang.org/reference/expressions.html#temporaries

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Thank you!

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BTW, in this case you probably want mem::replace

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