Overloaded calls must now be written as `(*self)()` instead of `self()`

[japaric]

STR

#![feature(overloaded_calls)]

struct Foo;

impl Fn<(), ()> for Foo {
    extern "rust-call" fn call(&self, args: ()) {
        unimplemented!();
    }
}

impl Foo {
    fn foo(self) {
        self();
        self.call(());
    }

    fn bar(&self) {
        (*self)();  // OK
        self();  //~ error: expected function, found `&Foo`
        self.call(());  // OK
    }

    fn baz(&mut self) {
        (*self)();  // OK
        self();  //~ error: expected function, found `&mut Foo`
        self.call(());  // OK
    }
}

fn main() {}

Version

rustc 0.13.0-dev (97a57ec90 2014-11-07 11:31:25 +0000)

---

I think all these cases should work since self() should be sugar for self.call(()) and that method call works on the three cases.

Also, it seems the situation has regressed recently, because on the playpen bar is also working. The playpen is using this older version of the compiler:

rustc 0.13.0-dev (5c1fd5f8b 2014-11-05 18:01:53 +0000)

This is probably related to #18349

cc @nikomatsakis

[nikomatsakis]

Right. I guess we have to decide whether overloaded calls auto-deref. Presumably they should.