foo.rs

#![feature(asm)]

use std::ptr;

fn black_box<T>(t: &T) {
    unsafe { asm!("" : : "r"(t)); }
}

fn main() {
    let mut x = Vec::<u8>::with_capacity(1024 * 1024 * 1024);
    for _ in 0..10 {
        black_box(&x);
        black_box(&x.as_ptr());
        let a = x.as_ptr();
        let b = x.as_mut_ptr();
        black_box(&a);
        black_box(&b);
        let c = x.capacity();
        black_box(&c);
        unsafe {
            ptr::copy(a, b, c);
        }
        black_box(&x);
    }
}