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 | //@ check-pass
#![feature(fn_traits, unboxed_closures)]
#[allow(dead_code)]
struct Foo;
impl Fn<(&(),)> for Foo {
    extern "rust-call" fn call(&self, (_,): (&(),)) {}
}
impl FnMut<(&(),)> for Foo {
    extern "rust-call" fn call_mut(&mut self, (_,): (&(),)) {}
}
impl FnOnce<(&(),)> for Foo {
    type Output = ();
    extern "rust-call" fn call_once(self, (_,): (&(),)) {}
}
fn main() {}
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