1 // run-pass 2 use std::ops::FnMut; 3 call_it<F:FnMut(i32,i32)->i32>(y: i32, mut f: F) -> i324fn call_it<F:FnMut(i32,i32)->i32>(y: i32, mut f: F) -> i32 { 5 f(2, y) 6 } 7 main()8pub fn main() { 9 let f = |x: i32, y: i32| -> i32 { x + y }; 10 let z = call_it(3, f); 11 println!("{}", z); 12 assert_eq!(z, 5); 13 } 14