take(_v: Box<isize>)1 fn take(_v: Box<isize>) {
2 }
3 
4 
5 
6 
7 
box_imm()8 fn box_imm() {
9     let v = Box::new(3);
10     let w = &v;
11     take(v); //~ ERROR cannot move out of `v` because it is borrowed
12     w.use_ref();
13 }
14 
main()15 fn main() {
16 }
17 
use_mut(&mut self)18 trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
19 impl<T> Fake for T { }
20