Could we access associated type out of a struct?

[hicqu]

here is a piece of code:

trait A {
    type AA;
}

struct S;

impl A for S {
    type AA = String;
}

// how to access AA out of S?
let aa_instance = S::AA::new();    // wrong
let aa_instance = (S as A)::AA::new();    // wrong

could you help me? Thanks!

[petrochenkov]

@hicqu

let aa_instance = <S as A>::AA::new();

S::AA::new() is supposed to work too, but it's not implemented yet. It's a long standing issue and the fix is non-trivial.

[steveklabnik]

@hicqu generally, http://users.rust-lang.org/ is the right place to ask for help.

Since @petrochenkov has given you an answer, I'm going to give this a close. Thanks!