Rename ~const Drop to ~const Destruct

library/core/src/marker.rs

@@ -794,10 +794,19 @@ impl<T: ?Sized> Unpin for *mut T {}
 
 /// A marker for types that can be dropped.
 ///
-/// The compiler logic for this trait is currently unimplemented.
+/// This should be used for `~const` bounds,
+/// as non-const bounds will always hold for every type.
 #[unstable(feature = "const_trait_impl", issue = "67792")]
-#[cfg_attr(not(bootstrap), lang = "destructible")]
-pub trait Destructible {}
+#[cfg_attr(not(bootstrap), lang = "destruct")]
+#[cfg_attr(
+    not(bootstrap),
+    rustc_on_unimplemented(message = "can't drop `{Self}`", append_const_msg,)
+)]
+pub trait Destruct {}
+
+#[cfg(bootstrap)]
+#[unstable(feature = "const_trait_impl", issue = "67792")]
+impl<T: ?Sized> const Destruct for T {}
 
 /// Implementations of `Copy` for primitive types.
 ///