Explicitly use version 0.2 of crates

src/rustc/driver/rustc.rs

@@ -1,5 +1,10 @@
-use std;
-use rustc;
+#[no_core];
+
+use core(vers = "0.2");
+use std(vers = "0.2");
+use rustc(vers = "0.2");
+
+import core::*;
 
 // -*- rust -*-
 import result::{ok, err};

src/rustc/rustc.rc

@@ -9,11 +9,13 @@
 #[license = "MIT"];
 #[crate_type = "lib"];
 
-use std (name = "std",
-         vers = "0.2",
-         url = "https://github.com/mozilla/rust/tree/master/src/libstd");
+#[no_core];
 
-use rustsyntax;
+use core(vers = "0.2");
+use std(vers = "0.2");
+use rustsyntax(vers = "0.2");
+
+import core::*;
 
 mod middle {
     mod trans {