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