bors 6a979b3e32 Auto merge of #153108 - alexcrichton:revert, r=joboet ...

Revert "Simplify internals of `{Rc,Arc}::default`"

This reverts rust-lang/rust#152591 following a [perf run being done](https://github.com/rust-lang/rust/pull/152591#issuecomment-3960081137). I'm not really positioned at this time to dive in further and understand the performance regressions, so I'll back away from `Rc`/`Arc` and leave them as-is.

2026-02-26 19:51:40 +00:00

..

boxed

Stabilize alloc_layout_extra

2026-01-11 16:39:18 +03:00

collections

Rollup merge of #152418 - asder8215:btreemap_merge_optimized, r=Mark-Simulacrum

2026-02-24 22:51:38 -05:00

ffi

remove from impl block in std

2026-02-08 22:22:58 +01:00

raw_vec

Add try_shrink_to and try_shrink_to_fit to Vec

2026-02-23 01:20:41 +00:00

vec

Remove redundant self usages

2026-02-25 22:51:53 +08:00

wtf8

Stabilize char_max_len

2025-11-14 18:23:19 +03:00

alloc.rs

add write_box_via_move intrinsic and use it for vec!

2026-02-16 17:27:40 +01:00

borrow.rs

alloc: Move Cow impl to existing ones

2026-01-02 20:40:04 +01:00

boxed.rs

What if we discourage mir-inlining of box_new_uninit?

2026-02-17 09:09:48 -08:00

bstr.rs

Remove named lifetimes in some PartialOrd & PartialEq impls

2026-02-14 00:13:46 +03:00

fmt.rs

Add some clarifications and fixes for fmt syntax

2026-01-12 09:35:59 -08:00

intrinsics.rs

add write_box_via_move intrinsic and use it for vec!

2026-02-16 17:27:40 +01:00

lib.miri.rs

add 'x.py miri', and make it work for 'library/{core,alloc,std}'

2024-04-03 20:27:20 +02:00

lib.rs

make rustc_allow_const_fn_unstable an actual rustc_attrs attribute

2026-02-17 20:16:29 +00:00

macros.rs

add write_box_via_move intrinsic and use it for vec!

2026-02-16 17:27:40 +01:00

rc.rs

Revert "Simplify internals of {Rc,Arc}::default"

2026-02-25 13:09:14 -08:00

slice.rs

adjust clippy to fix some of the issues

2026-02-16 17:27:40 +01:00

str.rs

const { 'Σ'.len_utf8() }

2026-02-07 17:20:39 +03:00

string.rs

Remove named lifetimes in some PartialOrd & PartialEq impls

2026-02-14 00:13:46 +03:00

sync.rs

Revert "Simplify internals of {Rc,Arc}::default"

2026-02-25 13:09:14 -08:00

task.rs

Apply suggestion from @tisonkun

2026-01-07 09:31:59 +08:00