Private trait appears in the documentation

[japaric]

STR

// lib.rs
trait Private {}

// main.rs
extern crate lib;

use lib::Private;

fn main() {}

$ rustc --crate-type=lib lib.rs
$ rustc -L . main.rs
main.rs:3:5: 3:18 error: trait `Private` is private
main.rs:3 use lib::Private;
              ^~~~~~~~~~~~~
error: aborting due to previous error
$ rustdoc lib.rs

Version

rustc 0.12.0-pre (eff87bc9d 2014-08-17 13:11:06 +0000)