1 // Tests that unsafe extern fn pointers do not implement any Fn traits.
2
3 use std::ops::{Fn, FnMut, FnOnce};
4
square(x: isize) -> isize5 unsafe fn square(x: isize) -> isize {
6 x * x
7 }
8 // note: argument type here is `isize`, not `&isize`
9
call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize10 fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
11 0
12 }
call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize13 fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
14 0
15 }
call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize16 fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
17 0
18 }
19
a()20 fn a() {
21 let x = call_it(&square, 22);
22 //~^ ERROR E0277
23 }
24
b()25 fn b() {
26 let y = call_it_mut(&mut square, 22);
27 //~^ ERROR E0277
28 }
29
c()30 fn c() {
31 let z = call_it_once(square, 22);
32 //~^ ERROR E0277
33 }
34
main()35 fn main() {}
36