Document `panic!` for Iterator::last (Repeat)

[tdelmas]

Location (URL)

https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.last
https://doc.rust-lang.org/std/iter/struct.Repeat.html#method.last

Summary

https://doc.rust-lang.org/src/core/iter/sources/repeat.rs.html#105

This panic! added in rust 1.92 is not documented. Neither in Iterator::last nor in repeat.

#146410

https://dev-doc.rust-lang.org/1.92.0/releases.html :

• iter::Repeat::last and count will now panic, rather than looping infinitely.

count does document the panic! in Iterator Iterator::count in std::iter but last didn't.

I think this panic! should be documented both in the Iterator trait and in the Repeat implementation.