1error[E0277]: expected a `Fn<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
2  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:20:21
3   |
4LL |     let x = call_it(&square, 22);
5   |             ------- ^^^^^^^ expected an `Fn<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
6   |             |
7   |             required by a bound introduced by this call
8   |
9   = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
10note: required by a bound in `call_it`
11  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:9:15
12   |
13LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
14   |               ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
15
16error[E0277]: expected a `FnMut<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
17  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:25:25
18   |
19LL |     let y = call_it_mut(&mut square, 22);
20   |             ----------- ^^^^^^^^^^^ expected an `FnMut<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
21   |             |
22   |             required by a bound introduced by this call
23   |
24   = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
25note: required by a bound in `call_it_mut`
26  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:19
27   |
28LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
29   |                   ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
30
31error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
32  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:30:26
33   |
34LL |     let z = call_it_once(square, 22);
35   |             ------------ ^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
36   |             |
37   |             required by a bound introduced by this call
38   |
39   = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
40note: required by a bound in `call_it_once`
41  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:15:20
42   |
43LL | fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
44   |                    ^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_once`
45
46error: aborting due to 3 previous errors
47
48For more information about this error, try `rustc --explain E0277`.
49