1 // Make sure that we cannot return a `&` that got already invalidated, not even in a tuple.
2 // Due to shallow reborrowing, the error only surfaces when we look into the tuple.
3 fn foo(x: &mut (i32, i32)) -> (&i32,) {
4 let xraw = x as *mut (i32, i32);
5 let ret = (unsafe { &(*xraw).1 },);
6 unsafe { *xraw = (42, 23) }; // unfreeze
11 foo(&mut (1, 2)).0; //~ ERROR: /retag .* tag does not exist in the borrow stack/