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Code shared from the Rust Playground
use std::mem::transmute;
fn main() {
let a: Vec<u64> = Vec::new();
let r = &a;
let r: &mut Vec<u64> = unsafe { transmute(r) };
println!("{:?}", a);
let x = &666;
let y: *mut i32 = x as *const _ as *mut i32;
unsafe { *y = 5 };
println!("{:?}", x);
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