fix incorrect region code based on the old 'self

also removes unnecessary casts from the RcMut implementation

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libcore/cast.rs b/src/libcore/cast.rs
index 96e1c3bd124..c648ec198e1 100644
--- a/src/libcore/cast.rs
+++ b/src/libcore/cast.rs
@@ -110,6 +110,12 @@ pub unsafe fn copy_lifetime<'a,S,T>(_ptr: &'a S, ptr: &T) -> &'a T {
 
 /// Transforms lifetime of the second pointer to match the first.
 #[inline(always)]
+pub unsafe fn copy_mut_lifetime<'a,S,T>(_ptr: &'a mut S, ptr: &mut T) -> &'a mut T {
+    transmute_mut_region(ptr)
+}
+
+/// Transforms lifetime of the second pointer to match the first.
+#[inline(always)]
 pub unsafe fn copy_lifetime_vec<'a,S,T>(_ptr: &'a [S], ptr: &T) -> &'a T {
     transmute_region(ptr)
 }