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#![feature(fn_traits, unboxed_closures)]
struct Foo;
impl<'a, T> Fn<(&'a T,)> for Foo {
extern "rust-call" fn call(&self, (_,): (T,)) {}
//~^ ERROR: has an incompatible type for trait
}
impl<'a, T> FnMut<(&'a T,)> for Foo {
extern "rust-call" fn call_mut(&mut self, (_,): (T,)) {}
//~^ ERROR: has an incompatible type for trait
}
impl<'a, T> FnOnce<(&'a T,)> for Foo {
type Output = ();
extern "rust-call" fn call_once(self, (_,): (T,)) {}
//~^ ERROR: has an incompatible type for trait
}
fn main() {}
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