src/test/ui/mismatched_types/unboxed-closures-vtable-mismatch.rs

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