error[E0502]: cannot borrow `*v` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-lend-flow-loop.rs:29:16
   |
LL |     let mut x = &mut v;
   |                 ------ mutable borrow occurs here
LL |     for _ in 0..3 {
LL |         borrow(&*v);
   |                ^^^ immutable borrow occurs here
LL |     }
LL |     *x = box 5;
   |     -- mutable borrow later used here

error[E0502]: cannot borrow `*v` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-lend-flow-loop.rs:92:16
   |
LL |         **x += 1;
   |         -------- mutable borrow later used here
LL |         borrow(&*v);
   |                ^^^ immutable borrow occurs here
LL |         if cond2 {
LL |             x = &mut v; // OK
   |                 ------ mutable borrow occurs here

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0502`.