Cannot call a unboxed-closure trait object with () syntax

[huonw]

#![feature(unboxed_closures)]


fn main() {
    let f: &Fn<(), ()> = &|&:| ();

    f()
}

<anon>:7:5: 7:8 error: expected function, found `&core::ops::Fn<(),()>`
<anon>:7     f()
             ^~~

[nixpulvis]

Wouldn't this need feature(overloaded_calls) anyway?

[arthurprs]

Sub. Stumbled across this in my code today.

[alexcrichton]

Nominating, I think this may actually be the only remaining major blocker for old closures to be removed from the language.

[ftxqxd]

I think that #19187 would fix this.