I believe that this is a copy/paste error; this example was using f32,
but it's the docs for f64.

And also point people to use the associated constants of f32 instead.

rename-unique: Change calls and doc in raw_vec.rs

rename-unique: Change empty() -> dangling() in const-ptr-unique-rpass.rs

Co-Authored-By: Nkennytm <kennytm@gmail.com>

The wording was discussed, to a limited degree in #71679.  This tries to
address some confusion I as well as someone else had independently when
looking at this macro.

Fixes #71679

The `Eq` link was incorrectly going to the `eq` method of `PartialEq`
instead of to the `Eq` trait.

Add documentation example to slice_from_raw_parts_mut()
Add SAFETY explanations to some unsafe blocks in libcore/ptr

* libcore/ptr/mod.rs
* libcore/ptr/unique.rs
* libcore/ptr/non_null.rs

safety-mod.rs: Add SAFETY to slice_from_raw_parts(),
slice_from_raw_parts_mut()

slice_from_raw_parts_mut: Add documentation example

safety-ptr-unique.rs: Add SAFETY to new() and cast()

safety-ptr-non_null.rs: Add SAFETY to new()

safety-ptr-non_null.rs: Add SAFETY to cast()

safety-ptr-non_null.rs: Add SAFETY to from() impls

safety-ptr-unique.rs: Add SAFETY to from() impls

safety-ptr-non_null.rs: Add SAFETY to new()

safety-ptr-unique.rs: Add SAFETY to new()

safety-ptr-mod.rs: Fix safety explanation

https://github.com/rust-lang/rust/pull/71507#discussion_r414488884

safety-prt-non_null.rs: Fix SAFETY comment syntax

safety-ptr-unique.rs: Fix syntax for empty()

safety-ptr-non_null.rs: Fix misuse of non-null for align_of()

safety-ptr-non_null.rs: Remove incorrect SAFETY comment

safety-ptr-unique.rs: Remove unsound SAFETY comment

safety-ptr-mod.rs: Add std comment on slice_from_raw_parts guarantee

safety-ptr-unique.rs: Remove incorrect safety comment

Creating a Unique from a NonNull has strict guarantees that the current
implementation does not guarantee

https://github.com/rust-lang/rust/pull/71507#discussion_r415035952

safety-ptr: Re-adding ignore-tidy directive

In the same vein as `Cell::take` and `Option::take`.

Co-Authored-By: NMark-Simulacrum <mark.simulacrum@gmail.com>

Changed raw pointer name from ptr to raw_pointer to avoid confusion with
the `use std::ptr` statement a few lines above. This way the crate name
and pointer name are well differenciated.

Co-authored-by: NMark-Simulacrum <mark.simulacrum@gmail.com>

The feature will become stable in Rust 1.45.
Noted that the value of UNICODE_VERSION is expected to change.

Only the "first" iterator is actually set `None` when exhausted,
depending on whether you iterate forward or backward. This restores
behavior similar to the former `ChainState`, where it would transition
from `Both` to `Front`/`Back` and only continue from that side.

However, if you mix directions, then this may still set both sides to
`None`, totally fusing the iterator.

Co-Authored-By: NAmanieu d'Antras <amanieu@gmail.com>