error: lifetime may not live long enough --> $DIR/regions-reborrow-from-shorter-mut-ref.rs:6:5 | LL | fn copy_borrowed_ptr<'a, 'b>(p: &'a mut &'b mut isize) -> &'b mut isize { | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here LL | &mut **p | ^^^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` | = help: consider adding the following bound: `'a: 'b` error: aborting due to 1 previous error