// run-pass | |
#![feature(const_generics, const_evaluatable_checked)] | |
#![allow(incomplete_features)] | |
use std::{mem, ptr}; | |
fn split_first<T, const N: usize>(arr: [T; N]) -> (T, [T; N - 1]) | |
where | |
[T; N - 1]: Sized, | |
{ | |
let arr = mem::ManuallyDrop::new(arr); | |
unsafe { | |
let head = ptr::read(&arr[0]); | |
let tail = ptr::read(&arr[1..] as *const [T] as *const [T; N - 1]); | |
(head, tail) | |
} | |
} | |
fn main() { | |
let arr = [0, 1, 2, 3, 4]; | |
let (head, tail) = split_first(arr); | |
assert_eq!(head, 0); | |
assert_eq!(tail, [1, 2, 3, 4]); | |
} |