error[E0506]: cannot assign to `a` because it is borrowed
  --> $DIR/ret-ref.rs:16:5
   |
LL |     let future = multiple_named_lifetimes(&a, &b);
   |                                           -- `a` is borrowed here
LL |     a += 1;
   |     ^^^^^^ `a` is assigned to here but it was already borrowed
LL |     b += 1;
LL |     let p = future.await;
   |             ------ borrow later used here

error[E0506]: cannot assign to `b` because it is borrowed
  --> $DIR/ret-ref.rs:17:5
   |
LL |     let future = multiple_named_lifetimes(&a, &b);
   |                                               -- `b` is borrowed here
LL |     a += 1;
LL |     b += 1;
   |     ^^^^^^ `b` is assigned to here but it was already borrowed
LL |     let p = future.await;
   |             ------ borrow later used here

error[E0506]: cannot assign to `a` because it is borrowed
  --> $DIR/ret-ref.rs:28:5
   |
LL |     let future = multiple_named_lifetimes(&a, &b);
   |                                           -- `a` is borrowed here
LL |     let p = future.await;
LL |     a += 1;
   |     ^^^^^^ `a` is assigned to here but it was already borrowed
LL |     b += 1;
LL |     drop(p);
   |          - borrow later used here

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0506`.