1 // run-pass 2 // Tests that the re-exports of `FnOnce` et al from the prelude work. 3 4 // pretty-expanded FIXME #23616 5 main()6fn main() { 7 let task: Box<dyn Fn(isize) -> isize> = Box::new(|x| x); 8 task(0); 9 10 let mut task: Box<dyn FnMut(isize) -> isize> = Box::new(|x| x); 11 task(0); 12 13 call(|x| x, 22); 14 } 15 call<F:FnOnce(isize) -> isize>(f: F, x: isize) -> isize16fn call<F:FnOnce(isize) -> isize>(f: F, x: isize) -> isize { 17 f(x) 18 } 19