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#![feature(unboxed_closures,tuple_trait)]
use std::ops::FnMut;
fn to_fn_mut<A:std::marker::Tuple, F:FnMut<A>>(f: F) -> F { f }
fn call_it<F: FnMut(isize, isize) -> isize>(y: isize, mut f: F) -> isize {
//~^ NOTE required by this bound in `call_it`
//~| NOTE required by a bound in `call_it`
f(2, y)
}
pub fn main() {
let f = to_fn_mut(|x: usize, y: isize| -> isize { (x as isize) + y });
//~^ NOTE found signature defined here
let z = call_it(3, f);
//~^ ERROR type mismatch
//~| NOTE expected due to this
//~| NOTE expected closure signature `fn(isize, _) -> _`
//~| NOTE required by a bound introduced by this call
println!("{}", z);
}
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