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

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// Make sure that we cannot load from memory a `&mut` that got already invalidated.
fn main() {
let x = &mut 42;
let xraw = x as *mut _;
let xref = unsafe { &mut *xraw };
let xref_in_mem = Box::new(xref);
let _val = *x; // invalidate xraw
let _val = *xref_in_mem; //~ ERROR Mut reference with non-reactivatable tag
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}