Cannot destructure structs cross crates

[erickt]

This is an even worse version of #3766. There's no way that I can figure out to get destructuring a struct cross crates working. Here's an example:

foo.rs:

pub struct Foo {
    foo: int,
}

bar.rs:

extern mod foo;
use foo::Foo;

fn main() {
    let Foo { foo: _foo }  = Foo { foo: 1 };
}

Errors with:

bar.rs:5:8: 5:11 error: `Foo` does not name a structure
bar.rs:5     let Foo { foo: _foo }  = Foo { foo: 1 };
                 ^~~
error: aborting due to previous error

[bblum]

wonder if this is related to #3177

[pcwalton]

Fixed in 3f78e0e.