[rust-dev] type `&~A:Send` does not implement any method in scope named `a`

[Torste Aikio]

This code gives "error: type `&~A:Send` does not implement any method
in scope named `a`" when compiled with rustc 0.9-pre (c8e77d5
2013-10-14 07:26:47 -0700).

trait A {
    fn a();
}

struct B;

impl A for B {
    fn a() {
        println!("a()");
    }
}

struct C {
    av: ~[~A]
}

impl C {
    fn process(&self) {
        for a in self.av.iter() {
            a.a(); // <-- error here
        }
    }
}

fn main() {
    let c = C { av: ~[~B as ~A] };
    c.process();
}


Could someone explain why and how to work around the issue?

/Torste Aikio

ps. I hope this is right place to ask
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