Add rw_arc.downgrade() + std and cfail tests. Tons of region FIXMEs... (cf #2282, #3154)

1 files changed, 12 insertions, 0 deletions

diff --git a/src/libcore/unsafe.rs b/src/libcore/unsafe.rs
index f8c6074abcf..f945cb8ad1d 100644
--- a/src/libcore/unsafe.rs
+++ b/src/libcore/unsafe.rs
@@ -1,6 +1,7 @@
 //! Unsafe operations
 
 export reinterpret_cast, forget, bump_box_refcount, transmute;
+export transmute_mut, transmute_immut, transmute_region, transmute_mut_region;
 
 export SharedMutableState, shared_mutable_state, clone_shared_mutable_state;
 export get_shared_mutable_state, get_shared_immutable_state;
@@ -53,6 +54,17 @@ unsafe fn transmute<L, G>(-thing: L) -> G {
     return newthing;
 }
 
+/// Coerce an immutable reference to be mutable.
+unsafe fn transmute_mut<T>(+ptr: &T) -> &mut T { transmute(ptr) }
+/// Coerce a mutable reference to be immutable.
+unsafe fn transmute_immut<T>(+ptr: &mut T) -> &T { transmute(ptr) }
+/// Coerce a borrowed pointer to have an arbitrary associated region.
+unsafe fn transmute_region<T>(+ptr: &a/T) -> &b/T { transmute(ptr) }
+/// Coerce a borrowed mutable pointer to have an arbitrary associated region.
+unsafe fn transmute_mut_region<T>(+ptr: &a/mut T) -> &b/mut T {
+    transmute(ptr)
+}
+
 /****************************************************************************
  * Shared state & exclusive ARC
  ****************************************************************************/