|  | warning: denote infinite loops with `loop { ... }` | 
|  | --> $DIR/mut-borrow-in-loop.rs:15:9 | 
|  | | | 
|  | LL |         while true { | 
|  | |         ^^^^^^^^^^ help: use `loop` | 
|  | | | 
|  | = note: `#[warn(while_true)]` on by default | 
|  |  | 
|  | error[E0499]: cannot borrow `*arg` as mutable more than once at a time | 
|  | --> $DIR/mut-borrow-in-loop.rs:10:25 | 
|  | | | 
|  | LL | impl<'a, T : 'a> FuncWrapper<'a, T> { | 
|  | |      -- lifetime `'a` defined here | 
|  | ... | 
|  | LL |             (self.func)(arg) | 
|  | |             ------------^^^- | 
|  | |             |           | | 
|  | |             |           `*arg` was mutably borrowed here in the previous iteration of the loop | 
|  | |             argument requires that `*arg` is borrowed for `'a` | 
|  |  | 
|  | error[E0499]: cannot borrow `*arg` as mutable more than once at a time | 
|  | --> $DIR/mut-borrow-in-loop.rs:16:25 | 
|  | | | 
|  | LL | impl<'a, T : 'a> FuncWrapper<'a, T> { | 
|  | |      -- lifetime `'a` defined here | 
|  | ... | 
|  | LL |             (self.func)(arg) | 
|  | |             ------------^^^- | 
|  | |             |           | | 
|  | |             |           `*arg` was mutably borrowed here in the previous iteration of the loop | 
|  | |             argument requires that `*arg` is borrowed for `'a` | 
|  |  | 
|  | error[E0499]: cannot borrow `*arg` as mutable more than once at a time | 
|  | --> $DIR/mut-borrow-in-loop.rs:23:25 | 
|  | | | 
|  | LL | impl<'a, T : 'a> FuncWrapper<'a, T> { | 
|  | |      -- lifetime `'a` defined here | 
|  | ... | 
|  | LL |             (self.func)(arg) | 
|  | |             ------------^^^- | 
|  | |             |           | | 
|  | |             |           `*arg` was mutably borrowed here in the previous iteration of the loop | 
|  | |             argument requires that `*arg` is borrowed for `'a` | 
|  |  | 
|  | error: aborting due to 3 previous errors; 1 warning emitted | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0499`. |