add lint deref_nullptr

Author: ABouttefeux

core/src/ptr/mod.rs

@@ -211,6 +211,7 @@ pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
 #[rustc_const_stable(feature = "const_ptr_null", since = "1.24.0")]
+#[rustc_diagnostic_item = "ptr_null"]
 pub const fn null<T>() -> *const T {
     0 as *const T
 }
@@ -229,6 +230,7 @@ pub const fn null<T>() -> *const T {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
 #[rustc_const_stable(feature = "const_ptr_null", since = "1.24.0")]
+#[rustc_diagnostic_item = "ptr_null_mut"]
 pub const fn null_mut<T>() -> *mut T {
     0 as *mut T
 }