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

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