rust/tests/compile-fail/unaligned_ptr_cast.rs

fn main() {
    let x = &2u16;
    let x = x as *const _ as *const u32;
    // This must fail because alignment is violated
    let _x = unsafe { *x }; //~ ERROR constant evaluation error
    //~^ NOTE tried to access memory with alignment 2, but alignment 4 is required
}