3 #![feature(const_fn_trait_ref_impls)]
5 #![feature(unboxed_closures)]
6 #![feature(const_trait_impl)]
7 #![feature(const_mut_refs)]
9 #![feature(const_refs_to_cell)]
11 use std::marker::Destruct;
13 const fn tester_fn<T>(f: T) -> T::Output
15 T: ~const Fn<()> + ~const Destruct,
20 const fn tester_fn_mut<T>(mut f: T) -> T::Output
22 T: ~const FnMut<()> + ~const Destruct,
27 const fn tester_fn_once<T>(f: T) -> T::Output
34 const fn test_fn<T>(mut f: T) -> (T::Output, T::Output, T::Output)
36 T: ~const Fn<()> + ~const Destruct,
39 // impl<A: Tuple, F: ~const Fn + ?Sized> const Fn<A> for &F
41 // impl<A: Tuple, F: ~const Fn + ?Sized> const FnMut<A> for &F
43 // impl<A: Tuple, F: ~const Fn + ?Sized> const FnOnce<A> for &F
48 const fn test_fn_mut<T>(mut f: T) -> (T::Output, T::Output)
50 T: ~const FnMut<()> + ~const Destruct,
53 // impl<A: Tuple, F: ~const FnMut + ?Sized> const FnMut<A> for &mut F
54 tester_fn_mut(&mut f),
55 // impl<A: Tuple, F: ~const FnMut + ?Sized> const FnOnce<A> for &mut F
56 tester_fn_once(&mut f),
59 const fn test(i: i32) -> i32 {
64 const fn one() -> i32 {
67 const fn two() -> i32 {
71 let test_one = test_fn(one);
72 assert!(test_one == (1, 1, 1));
74 let test_two = test_fn_mut(two);
75 assert!(test_two == (2, 2));