rust/tests/compile-fail/ptr_int_cast.rs

fn main() {
    let x = &1;
    // Casting down to u8 and back up to a pointer loses too much precision; this must not work.
    let x = x as *const i32;
    let x = x as u8; //~ ERROR constant evaluation error [E0080]
    //~^ NOTE a raw memory access tried to access part of a pointer value as raw bytes
    let x = x as *const i32;
    let _ = unsafe { *x };
}