Impl on type imported unqualified from different module

[huonw]

pub struct Foo;

mod bar {
    use Foo;

    impl Foo {
        fn baz(&self) {}
    }
}
fn main() {}

qualified.rs:6:10: 6:13 error: found module name used as a type: impl bar::Foo::Foo (id=10)
qualified.rs:6     impl Foo {
                        ^~~

[chris-morgan]

An example shorter still (depending on prelude types) is

impl Ascii {}
fn main() {}

<anon>:1:6: 1:11 error: found module name used as a type: impl Ascii::Ascii (id=5)
<anon>:1 impl Ascii {} fn main() {}
              ^~~~~