#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(pointer_is_aligned_to, transmutability)]
use core::mem::{Assume, TransmuteFrom};
fn main() {
    let src: &[u8; 2] = &[0xFF, 0xFF];
    let maybe_dst: Option<&u16> = if <*const _>::is_aligned_to(src, align_of::<u16>()) {
        Some(unsafe { <_ as TransmuteFrom<_, { Assume::ALIGNMENT }>>::transmute(src) })
    } else {
        None
    };
    assert!(matches!(maybe_dst, Some(& u16::MAX) | None));
}