Stabilize pin_static_ref.

Author: m-ou-se

library/core/src/pin.rs

@@ -798,7 +798,7 @@ impl<T: ?Sized> Pin<&'static T> {
     ///
     /// This is safe, because `T` is borrowed for the `'static` lifetime, which
     /// never ends.
-    #[unstable(feature = "pin_static_ref", issue = "78186")]
+    #[stable(feature = "pin_static_ref", since = "1.60.0")]
     #[rustc_const_unstable(feature = "const_pin", issue = "76654")]
     pub const fn static_ref(r: &'static T) -> Pin<&'static T> {
         // SAFETY: The 'static borrow guarantees the data will not be
@@ -851,7 +851,7 @@ impl<T: ?Sized> Pin<&'static mut T> {
     ///
     /// This is safe, because `T` is borrowed for the `'static` lifetime, which
     /// never ends.
-    #[unstable(feature = "pin_static_ref", issue = "78186")]
+    #[stable(feature = "pin_static_ref", since = "1.60.0")]
     #[rustc_const_unstable(feature = "const_pin", issue = "76654")]
     pub const fn static_mut(r: &'static mut T) -> Pin<&'static mut T> {
         // SAFETY: The 'static borrow guarantees the data will not be

library/std/src/lib.rs

@@ -310,7 +310,6 @@
 #![feature(panic_internals)]
 #![feature(panic_can_unwind)]
 #![feature(panic_unwind)]
-#![feature(pin_static_ref)]
 #![feature(platform_intrinsics)]
 #![feature(portable_simd)]
 #![feature(prelude_import)]