error[E0502]: cannot borrow `*v` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-lend-flow-loop.rs:45:16
   |
LL |     let mut x = &mut v;
   |                 ------ mutable borrow occurs here
LL |     for _ in 0..3 {
LL |         borrow(&*v); //[ast]~ ERROR cannot borrow
   |                ^^^ immutable borrow occurs here
...
LL |     *x = box 5;
   |     -- mutable borrow used here, in later iteration of loop

error[E0502]: cannot borrow `*v` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-lend-flow-loop.rs:109:16
   |
LL |         **x += 1;
   |         -------- mutable borrow used here, in later iteration of loop
LL |         borrow(&*v); //[ast]~ ERROR cannot borrow
   |                ^^^ immutable borrow occurs here
...
LL |             x = &mut v; //[ast]~ ERROR cannot borrow
   |                 ------ mutable borrow occurs here

error: aborting due to 2 previous errors

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