error[E0626]: borrow may still be in use when generator yields
  --> $DIR/yield-while-iterating.rs:22:18
   |
LL |         for p in &x { //~ ERROR
   |                  ^^
LL |             yield();
   |             ------- possible yield occurs here

error[E0502]: cannot borrow `x` as immutable because it is also borrowed as mutable
  --> $DIR/yield-while-iterating.rs:67:20
   |
LL |       let mut b = || {
   |  _________________-
LL | |         for p in &mut x {
LL | |             yield p;
LL | |         }
LL | |     };
   | |_____- mutable borrow occurs here
LL |       println!("{}", x[0]); //~ ERROR
   |                      ^ immutable borrow occurs here
LL |       b.resume();
   |       - borrow later used here

error: aborting due to 2 previous errors

Some errors occurred: E0502, E0626.
For more information about an error, try `rustc --explain E0502`.