Typedef'd enums cannot reference variants

[KiChjang]

The following code does not compile:

pub enum Foo {
    Bar,
    Qux,
}

pub type Alias = Foo;

fn main() {
    let baz = Alias::Bar;
}

It produces the following error message:

<anon>:9:15: 9:25 error: no associated item named `Bar` found for type `Foo` in the current scope
<anon>:9     let baz = Alias::Bar;
                       ^~~~~~~~~~
error: aborting due to previous error
playpen: application terminated with error code 101

[mitaa]

#26264