auto merge of #6226 : alexcrichton/rust/issue-6199, r=brson

I just removed `pub mod` from `core.rc` and then got everything to compile again. One thing I'm worried about is an import like this:

```rust
use a;
use a::b;

mod a {
  pub type b = int;
}
mod b {
  use a;    // bad
  use a::b; // good
}
```

I'm not sure if `use a::b` being valid is a bug or intended behavior (same question about `use a`). If it's intended behavior, then I got around these modules not being public by only importing the specific members that are necessary. Otherwise that probably needs an open issue.

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