core: Newtype a bunch of types in libcore

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 704c0fcaf4b..97795103f52 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -123,8 +123,13 @@ unsafe fn memset<T>(dst: *mut T, c: int, count: uint)  {
     libc_::memset(dst as *c_void, c as libc::c_int, n as size_t);
 }
 
+trait ptr {
+    pure fn is_null() -> bool;
+    pure fn is_not_null() -> bool;
+}
+
 /// Extension methods for pointers
-impl extensions<T> for *T {
+impl extensions<T> of ptr for *T {
     /// Returns true if the pointer is equal to the null pointer.
     pure fn is_null() -> bool { is_null(self) }