1 // Make sure that we cannot return a `&mut` that got already invalidated, not even in an `Option`.
2 fn foo(x: &mut (i32, i32)) -> Option<&mut i32> {
3 let xraw = x as *mut (i32, i32);
4 let ret = unsafe { &mut (*xraw).1 }; // let-bind to avoid 2phase
6 let _val = unsafe { *xraw }; // invalidate xref
7 ret //~ ERROR: /retag .* tag does not exist in the borrow stack/
11 match foo(&mut (1, 2)) {