make std::managed private

This removes two tests built on `managed::refcount`, but these issues
are well-covered elsewhere for non-managed types.

Author: thestinger

src/libstd/lib.rs

@@ -134,7 +134,7 @@ pub mod ascii;
 
 pub mod ptr;
 pub mod owned;
-pub mod managed;
+mod managed;
 mod reference;
 pub mod rc;
 pub mod gc;

src/libstd/managed.rs

@@ -12,13 +12,6 @@
 
 #[cfg(not(test))] use cmp::*;
 
-/// Returns the refcount of a shared box (as just before calling this)
-#[inline]
-pub fn refcount<T>(t: @T) -> uint {
-    use raw::Repr;
-    unsafe { (*t.repr()).ref_count - 1 }
-}
-
 /// Determine if two shared boxes point to the same object
 #[inline]
 pub fn ptr_eq<T>(a: @T, b: @T) -> bool {
@@ -66,14 +59,3 @@ fn test() {
     assert!((!ptr_eq::<int>(x, y)));
     assert!((!ptr_eq::<int>(y, x)));
 }
-
-#[test]
-fn refcount_test() {
-    use clone::Clone;
-
-    let x = @3;
-    assert_eq!(refcount(x), 1);
-    let y = x.clone();
-    assert_eq!(refcount(x), 2);
-    assert_eq!(refcount(y), 2);
-}