Add diagnostic items for <*mut _>::is_null and <*const _>::is_null

Author: Urgau

compiler/rustc_span/src/symbol.rs

@@ -1151,8 +1151,10 @@ symbols! {
         profiler_runtime,
         ptr,
         ptr_cast_mut,
+        ptr_const_is_null,
         ptr_from_ref,
         ptr_guaranteed_cmp,
+        ptr_is_null,
         ptr_mask,
         ptr_null,
         ptr_null_mut,

library/core/src/ptr/const_ptr.rs

@@ -30,6 +30,7 @@ impl<T: ?Sized> *const T {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_ptr_is_null", issue = "74939")]
+    #[rustc_diagnostic_item = "ptr_const_is_null"]
     #[inline]
     pub const fn is_null(self) -> bool {
         #[inline]

library/core/src/ptr/mut_ptr.rs

@@ -29,6 +29,7 @@ impl<T: ?Sized> *mut T {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_ptr_is_null", issue = "74939")]
+    #[rustc_diagnostic_item = "ptr_is_null"]
     #[inline]
     pub const fn is_null(self) -> bool {
         #[inline]