rust/library/alloc/src, branch 1.66.1

Bump version placeholders to release

2022-10-31T14:43:15+00:00

ptr::eq: clarify that comparing dyn Trait is fragile

2022-10-26T09:15:14+00:00

Clairify Vec::capacity docs

2022-10-24T14:01:58+00:00

Fixes #103326

Rollup merge of #99578 - steffahn:remove_redundant_bound, r=thomcc

2022-10-24T10:32:24+00:00

Remove redundant lifetime bound from `impl Borrow for Cow` The lifetime bound `B::Owned: 'a` is redundant and doesn't make a difference, because `Cow<'a, B>` comes with an implicit `B: 'a`, and associated types will outlive lifetimes outlived by the `Self` type (and all the trait's generic parameters, of which there are none in this case), so the implicit `B: 'a` implies `B::Owned: 'a` anyway. The explicit lifetime bound here does however [end up in documentation](https://doc.rust-lang.org/std/borrow/enum.Cow.html#impl-Borrow%3CB%3E), and that's confusing in my opinion, so let's remove it ^^ _(Documentation right now, compare to `AsRef`, too:)_ ![Screenshot_20220722_014055](https://user-images.githubusercontent.com/3986214/180332665-424d0c05-afb3-40d8-a330-a57a2c9a494b.png)

Fix typo in docs of `String::leak`.

2022-10-22T19:26:47+00:00

Rollup merge of #103346 - HeroicKatora:metadata_of_const_pointer_argument, r=dtolnay

2022-10-22T10:58:09+00:00

Adjust argument type for mutable with_metadata_of (#75091) The method takes two pointer arguments: one `self` supplying the pointer value, and a second pointer supplying the metadata. The new parameter type more clearly reflects the actual requirements. The provenance of the metadata parameter is disregarded completely. Using a mutable pointer in the call site can be coerced to a const pointer while the reverse is not true. In some cases, the current parameter type can thus lead to a very slightly confusing additional cast. [Example](https://github.com/HeroicKatora/static-alloc/commit/cad93775eb9adc62f744651e3abf19513e69e7d0). ```rust // Manually taking an unsized object from a `ManuallyDrop` into another allocation. let val: &core::mem::ManuallyDrop = …; let ptr = val as *const _ as *mut T; let ptr = uninit.as_ptr().with_metadata_of(ptr); ``` This could then instead be simplified to: ```rust // Manually taking an unsized object from a `ManuallyDrop` into another allocation. let val: &core::mem::ManuallyDrop = …; let ptr = uninit.as_ptr().with_metadata_of(&**val); ``` Tracking issue: https://github.com/rust-lang/rust/issues/75091 ``@dtolnay`` you're reviewed #95249, would you mind chiming in?

Rollup merge of #103280 - finnbear:impl_string_leak_2, r=joshtriplett

2022-10-22T10:58:08+00:00

(#102929) Implement `String::leak` (attempt 2) Implementation of `String::leak` (#102929) ACP: https://github.com/rust-lang/libs-team/issues/109 Supersedes #102941 (see previous reviews there) ```@rustbot``` label +T-libs-api -T-libs

Rollup merge of #103359 - WaffleLapkin:drain_no_mut_qqq, r=scottmcm

2022-10-21T22:14:03+00:00

Remove incorrect comment in `Vec::drain` r? ``@scottmcm`` Turns out this comment wasn't correct for 6 years, since #34951, which switched from using `slice::IterMut` into using `slice::Iter`.

Remove incorrect comment in `Vec::drain`

2022-10-21T15:29:02+00:00

Reduce mutability in std-use of with_metadata_of

2022-10-21T12:49:29+00:00