src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr

   1 error[E0277]: expected a `Fn<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
   2   --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:21:21
   3    |
   4 LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
   5    |               ------------------- required by this bound in `call_it`
   6 ...
   7 LL |     let x = call_it(&square, 22);
   8    |                     ^^^^^^^ expected an `Fn<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
   9    |
  10    = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}`
  11
  12 error[E0277]: expected a `FnMut<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
  13   --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:26:25
  14    |
  15 LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
  16    |                   ---------------------- required by this bound in `call_it_mut`
  17 ...
  18 LL |     let y = call_it_mut(&mut square, 22);
  19    |                         ^^^^^^^^^^^ expected an `FnMut<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
  20    |
  21    = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}`
  22
  23 error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
  24   --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:31:26
  25    |
  26 LL | fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
  27    |                    ----------------------- required by this bound in `call_it_once`
  28 ...
  29 LL |     let z = call_it_once(square, 22);
  30    |                          ^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `unsafe fn(isize) -> isize {square}`
  31    |
  32    = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}`
  33
  34 error: aborting due to 3 previous errors
  35
  36 For more information about this error, try `rustc --explain E0277`.