1 // run-pass 2 f(mut y: Box<isize>)3 fn f(mut y: Box<isize>) { 4 *y = 5; 5 assert_eq!(*y, 5); 6 } 7 g()8 fn g() { 9 let frob = |mut q: Box<isize>| { *q = 2; assert_eq!(*q, 2); }; 10 let w = Box::new(37); 11 frob(w); 12 13 } 14 main()15 pub fn main() { 16 let z = Box::new(17); 17 f(z); 18 g(); 19 } 20