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Rollup merge of #130954 - workingjubilee:stabilize-const-mut-fn, r=RalfJung

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Stabilize const `ptr::write*` and `mem::replace`

Since `const_mut_refs` and `const_refs_to_cell` have been stabilized, we may now also stabilize the ability to write to places during const evaluation inside our library API. So, we now propose the `const fn` version of `ptr::write` and its variants. This allows us to also stabilize `mem::replace` and `ptr::replace`.
- const `mem::replace`: https://github.com/rust-lang/rust/issues/83164#issuecomment-2338660862
- const `ptr::write{,_bytes,_unaligned}`: https://github.com/rust-lang/rust/issues/86302#issuecomment-2330275266

Their implementation requires an additional internal stabilization of `const_intrinsic_forget`, which is required for `*::write*` and thus `*::replace`. Thus we const-stabilize the internal intrinsics `forget`, `write_bytes`, and `write_via_move`.
This commit is contained in:
Trevor Gross
2024-10-12 11:08:42 -05:00
committed by GitHub
parent 63a91db022 187c8b0ce9
commit 8a86f1dd8c
10 changed files with 17 additions and 21 deletions
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library/core/src/lib.rs
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@@ -124,7 +124,6 @@
#![feature(const_hash)]
#![feature(const_heap)]
#![feature(const_index_range_slice_index)]
#![feature(const_intrinsic_forget)]
#![feature(const_ipv4)]
#![feature(const_ipv6)]
#![feature(const_likely)]
@@ -138,9 +137,7 @@
#![feature(const_pointer_is_aligned)]
#![feature(const_ptr_is_null)]
#![feature(const_ptr_sub_ptr)]
#![feature(const_ptr_write)]
#![feature(const_raw_ptr_comparison)]
#![feature(const_replace)]
#![feature(const_size_of_val)]
#![feature(const_size_of_val_raw)]
#![feature(const_strict_overflow_ops)]