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