/// This manually makes sure that we have a pointer with the proper alignment. fn manual_alignment() { let x = &mut [0u8; 3]; let base_addr = x as *mut _ as usize; let base_addr_aligned = if base_addr % 2 == 0 { base_addr } else { base_addr + 1 }; let u16_ptr = base_addr_aligned as *mut u16; unsafe { *u16_ptr = 2; } } /// Test standard library `align_to`. fn align_to() { const LEN: usize = 128; let buf = &[0u8; LEN]; let (l, m, r) = unsafe { buf.align_to::() }; assert!(m.len() * 4 >= LEN - 4); assert!(l.len() + r.len() <= 4); } fn main() { // Do this a couple times in a loop because it may work "by chance". for _ in 0..10 { manual_alignment(); align_to(); } }