Infinite redirect loop on doc page for 'core::str::trait'

http://static.rust-lang.org/doc/master/core/str/traits/index.html

has contents

``` html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="refresh" content="0;URL=../../../core/str/traits/index.html">
</head>
<body>
</body>
</html>
```

and that `URL=...` link points to itself, leaving your web-browser refreshing forever.
