This is a fairly common attribute on methods, but is not something you
need to know when reading the method docs - the purpose of the attribute
is for the compiler to tell you about it if you forget to use a value.

Removing reclaims some valuable space in the summary of methods.

For reasoning, see rust-lang#63567 (comment)

…=JohnTitor

Integrate binary search codes of binary_search_by and partition_point

For now partition_point has own binary search code piece.
It is because binary_search_by had called the comparer more times and the author (=me) wanted to avoid it.

However, now binary_search_by uses the comparer minimum times. (rust-lang#74024)
So it's time to integrate them.

The appearance of the codes are a bit different but both use completely same logic.

…=JohnTitor

Refactor windows sockets impl methods

No behavioural changes, but a bit tidier visual flow.

Improve maybe_uninit_extra docs

For reasoning, see rust-lang#63567 (comment)

Remove must_use from ALLOWED_ATTRIBUTES

This is a fairly common attribute on methods, but is not something you need to know when reading the method docs - the purpose of the attribute is for the compiler to tell you about it if you forget to use a value.

Removing reclaims some valuable space in the summary of methods, particularly when the attribute has a long string value.

As discussed in rust-lang#84309. Partially addresses rust-lang#81482.

r? ``@Manishearth``

…joshtriplett

Stabilize {std, core}::prelude::rust_*.

This stabilizes the `{core, std}::prelude::{rust_2015, rust_2018, rust_2021}` modules.

The usage of these modules as the prelude in those editions was already stabilized. This just stabilizes the modules themselves, making it possible for a user to explicitly refer to them.

Tracking issue: rust-lang#85684

FCP on the RFC that included this finished here: rust-lang/rfcs#3114 (comment)

…ulacrum

Add mailmap entries for myself