rust/tests/compile-fail/pointer_byte_read_2.rs

fn main() {
    let x = 13;
    let y = &x;
    let z = &y as *const &i32 as *const u8;
    // the deref fails, because we are reading only a part of the pointer
    let _ = unsafe { *z }; //~ ERROR constant evaluation error [E0080]
    //~^ NOTE tried to access part of a pointer value as raw bytes
}