Now using use along with enums, as per https://github.com/rust-lang/rust/pull/18973.

src/version.rs

@@ -4,6 +4,8 @@
 //! the `HttpVersion` enum.
 use std::fmt;
 
+use self::HttpVersion::{Http09, Http10, Http11, Http20};
+
 /// Represents a version of the HTTP spec.
 #[deriving(PartialEq, PartialOrd)]
 pub enum HttpVersion {