rust/tests/compile-fail/stacked_borrows/illegal_write5.rs

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// A callee may not write to the destination of our `&mut` without
// us noticing.
fn main() {
let mut x = 15;
let xraw = &mut x as *mut _;
let xref = unsafe { &mut *xraw }; // derived from raw, so using raw is still okay...
callee(xraw);
let _val = *xref; // ...but any use of raw will invalidate our ref.
//~^ ERROR: reference with non-reactivatable tag
}
fn callee(xraw: *mut i32) {
unsafe { *xraw = 15 };
}