|  | fn test_drop_replace() { | 
|  | let b: Box<isize>; | 
|  | //~^ HELP consider making this binding mutable | 
|  | //~| SUGGESTION mut b | 
|  | b = Box::new(1);    //~ NOTE first assignment | 
|  | b = Box::new(2);    //~ ERROR cannot assign twice to immutable variable `b` | 
|  | //~| NOTE cannot assign twice to immutable | 
|  | } | 
|  |  | 
|  | fn test_call() { | 
|  | let b = Box::new(1);    //~ NOTE first assignment | 
|  | //~| HELP consider making this binding mutable | 
|  | //~| SUGGESTION mut b | 
|  | b = Box::new(2);        //~ ERROR cannot assign twice to immutable variable `b` | 
|  | //~| NOTE cannot assign twice to immutable | 
|  | } | 
|  |  | 
|  | fn test_args(b: Box<i32>) {  //~ HELP consider making this binding mutable | 
|  | //~| SUGGESTION mut b | 
|  | b = Box::new(2);            //~ ERROR cannot assign to immutable argument `b` | 
|  | //~| NOTE cannot assign to immutable argument | 
|  | } | 
|  |  | 
|  | fn main() {} |