From a288bf6afbf7f98fd357b971b23ef09a66aaa8c0 Mon Sep 17 00:00:00 2001 From: Maybe Waffle Date: Fri, 22 Oct 2021 11:15:56 +0300 Subject: Mark {array,slice}::{from_ref,from_mut} as const fn --- library/core/src/array/mod.rs | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'library/core/src/array') diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs index 8d5c0510404..752e3fceb35 100644 --- a/library/core/src/array/mod.rs +++ b/library/core/src/array/mod.rs @@ -85,14 +85,16 @@ where /// Converts a reference to `T` into a reference to an array of length 1 (without copying). #[stable(feature = "array_from_ref", since = "1.53.0")] -pub fn from_ref(s: &T) -> &[T; 1] { +#[rustc_const_unstable(feature = "const_array_from_ref", issue = "none")] +pub const fn from_ref(s: &T) -> &[T; 1] { // SAFETY: Converting `&T` to `&[T; 1]` is sound. unsafe { &*(s as *const T).cast::<[T; 1]>() } } /// Converts a mutable reference to `T` into a mutable reference to an array of length 1 (without copying). #[stable(feature = "array_from_ref", since = "1.53.0")] -pub fn from_mut(s: &mut T) -> &mut [T; 1] { +#[rustc_const_unstable(feature = "const_array_from_ref", issue = "none")] +pub const fn from_mut(s: &mut T) -> &mut [T; 1] { // SAFETY: Converting `&mut T` to `&mut [T; 1]` is sound. unsafe { &mut *(s as *mut T).cast::<[T; 1]>() } } -- cgit 1.4.1-3-g733a5