rust/tests/compile-fail/stacked_borrows/pointer_smuggling.rs

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static mut PTR: *mut u8 = 0 as *mut _;
fn fun1(x: &mut u8) {
unsafe {
PTR = x;
}
}
fn fun2() {
// Now we use a pointer we are not allowed to use
let _x = unsafe { *PTR }; //~ ERROR does not exist on the stack
}
fn main() {
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let mut val = 0;
let val = &mut val;
fun1(val);
*val = 2; // this invalidates any raw ptrs `fun1` might have created.
fun2(); // if they now use a raw ptr they break our reference
}