1 #![feature(unboxed_closures)]
2
3 use std::ops::FnMut;
4
to_fn_mut<A,F:FnMut<A>>(f: F) -> F5 fn to_fn_mut<A,F:FnMut<A>>(f: F) -> F { f }
6
call_it<F:FnMut(isize,isize)->isize>(y: isize, mut f: F) -> isize7 fn call_it<F:FnMut(isize,isize)->isize>(y: isize, mut f: F) -> isize {
8 //~^ NOTE required by this bound in `call_it`
9 //~| NOTE required by a bound in `call_it`
10 f(2, y)
11 }
12
main()13 pub fn main() {
14 let f = to_fn_mut(|x: usize, y: isize| -> isize { (x as isize) + y });
15 //~^ NOTE found signature of `fn(usize, isize) -> _`
16 let z = call_it(3, f);
17 //~^ ERROR type mismatch
18 //~| NOTE expected signature of `fn(isize, isize) -> _`
19 //~| NOTE required by a bound introduced by this call
20 println!("{}", z);
21 }
22