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Mark `{array, slice}::{from_ref, from_mut}` as const fn by WaffleLapkin · Pull R...

 2 years ago
source link: https://github.com/rust-lang/rust/pull/90162
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WaffleLapkin commented 6 days ago

This PR marks the following APIs as const:

// core::array
pub const fn from_ref<T>(s: &T) -> &[T; 1];
pub const fn from_mut<T>(s: &mut T) -> &mut [T; 1];

// core::slice
pub const fn from_ref<T>(s: &T) -> &[T];
pub const fn from_mut<T>(s: &mut T) -> &mut [T];

Note that from_ref methods require const_raw_ptr_deref feature (which seems totally fine, since it's being stabilized, see #89551), from_mut methods require const_mut_refs (which seems fine too since this PR marks from_mut functions as const unstable).

r? @oli-obk


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