| // Tests that unsafe extern fn pointers do not implement any Fn traits. |
| |
| use std::ops::{Fn,FnMut,FnOnce}; |
| |
| unsafe fn square(x: isize) -> isize { x * x } |
| // note: argument type here is `isize`, not `&isize` |
| |
| fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 } |
| fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 } |
| fn call_it_once<F:FnOnce(&isize)->isize>(_: F, _: isize) -> isize { 0 } |
| |
| fn a() { |
| let x = call_it(&square, 22); |
| //~^ ERROR E0277 |
| //~| ERROR expected |
| } |
| |
| fn b() { |
| let y = call_it_mut(&mut square, 22); |
| //~^ ERROR E0277 |
| //~| ERROR expected |
| } |
| |
| fn c() { |
| let z = call_it_once(square, 22); |
| //~^ ERROR E0277 |
| } |
| |
| fn main() { } |
