temporaries-rabbit-hole/

[giscus[bot]]

temporaries-rabbit-hole/

Way too many words about how Rust's temporaries work

http://taping-memory.dev/temporaries-rabbit-hole/

[Kobzol]

Note that the example with Some should already compile on nightly :) rust-lang/rust#140593

[MalbaCato]

So about footnote two, apparently promotion does happen for &mut references, look.

This is a special edge case for specifically empty mutable slices (and empty arrays). I scoured the reference but it appears to be undocumented except for in the alternatives section of the temporary promotion rfc.

The rabbit hole only gets deeper and scarier.