impl<T> *const T, impl<T> *mut T

src/libstd/old_io/mod.rs

@@ -935,6 +935,7 @@ impl<'a> Reader for &'a mut (Reader+'a) {
 // API yet. If so, it should be a method on Vec.
 unsafe fn slice_vec_capacity<'a, T>(v: &'a mut Vec<T>, start: uint, end: uint) -> &'a mut [T] {
     use slice;
+    #[cfg(stage0)]
     use ptr::PtrExt;
 
     assert!(start <= end);