1 // run-pass
2 #![allow(unused_mut)]
3 #![allow(unused_imports)]
4 use std::ops::FnMut;
5 
main()6 pub fn main() {
7     let mut f = |x: isize, y: isize| -> isize { x + y };
8     let z = f(1, 2);
9     assert_eq!(z, 3);
10 }
11