more testing fallout from core->std/std->extra move

src/etc/extract-tests.py

@@ -57,8 +57,8 @@ while cur < len(lines):
         if not ignore:
             if not re.search(r"\bfn main\b", block):
                 block = "fn main() {\n" + block + "\n}\n"
-            if not re.search(r"\bextern mod std\b", block):
-                block = "extern mod std;\n" + block
+            if not re.search(r"\bextern mod extra\b", block):
+                block = "extern mod extra;\n" + block
             block = """#[ forbid(ctypes) ];
 #[ forbid(deprecated_pattern) ];
 #[ forbid(implicit_copies) ];

src/librusti/rusti.rc

@@ -431,6 +431,7 @@ pub fn main() {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use core::io;
 
     fn repl() -> Repl {
         Repl {

src/librustpkg/tests.rs

@@ -13,6 +13,7 @@
 use context::Ctx;
 use core::hashmap::HashMap;
 use core::path::Path;
+use core::prelude::*;
 use std::tempfile::mkdtemp;
 use util::{PkgId, default_version};
 use path_util::{target_executable_in_workspace, target_library_in_workspace,