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-rw-r--r--library/core/src/slice/mod.rs6
1 files changed, 4 insertions, 2 deletions
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index dc09ba8d788..479fe0f1554 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -5158,7 +5158,8 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<T> Default for &[T] {
+#[rustc_const_unstable(feature = "const_default", issue = "67792")]
+impl<T> const Default for &[T] {
     /// Creates an empty slice.
     fn default() -> Self {
         &[]
@@ -5166,7 +5167,8 @@ impl<T> Default for &[T] {
 }
 
 #[stable(feature = "mut_slice_default", since = "1.5.0")]
-impl<T> Default for &mut [T] {
+#[rustc_const_unstable(feature = "const_default", issue = "67792")]
+impl<T> const Default for &mut [T] {
     /// Creates a mutable empty slice.
     fn default() -> Self {
         &mut []