De-stabilize core::slice::{from_ref, from_ref_mut}.

src/liballoc/lib.rs

@@ -93,6 +93,7 @@
 #![feature(dropck_eyepatch)]
 #![feature(exact_size_is_empty)]
 #![feature(fmt_internals)]
+#![feature(from_ref)]
 #![feature(fundamental)]
 #![feature(fused)]
 #![feature(generic_param_attrs)]

src/liballoc/slice.rs

@@ -119,7 +119,7 @@
 pub use core::slice::{RSplit, RSplitMut};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{from_raw_parts, from_raw_parts_mut};
-#[stable(feature = "from_ref", since = "1.22.0")]
+#[unstable(feature = "from_ref", issue = "45703")]
 pub use core::slice::{from_ref, from_ref_mut};
 #[unstable(feature = "slice_get_slice", issue = "35729")]
 pub use core::slice::SliceIndex;

src/libcore/slice/mod.rs

@@ -2451,7 +2451,7 @@ pub unsafe fn from_raw_parts_mut<'a, T>(p: *mut T, len: usize) -> &'a mut [T] {
 }
 
 /// Converts a reference to T into a slice of length 1 (without copying).
-#[stable(feature = "from_ref", since = "1.22.0")]
+#[unstable(feature = "from_ref", issue = "45703")]
 pub fn from_ref<T>(s: &T) -> &[T] {
     unsafe {
         from_raw_parts(s, 1)
@@ -2459,7 +2459,7 @@ pub fn from_ref<T>(s: &T) -> &[T] {
 }
 
 /// Converts a reference to T into a slice of length 1 (without copying).
-#[stable(feature = "from_ref", since = "1.22.0")]
+#[unstable(feature = "from_ref", issue = "45703")]
 pub fn from_ref_mut<T>(s: &mut T) -> &mut [T] {
     unsafe {
         from_raw_parts_mut(s, 1)