test it in core

Author: Lukas Markeffsky

library/core/src/ptr/const_ptr.rs

@@ -57,10 +57,24 @@ impl<T: ?Sized> *const T {
     #[rustc_const_stable(feature = "const_ptr_cast", since = "1.38.0")]
     #[rustc_diagnostic_item = "const_ptr_cast"]
     #[inline(always)]
+    #[cfg(bootstrap)]
     pub const fn cast<U>(self) -> *const U {
         self as _
     }
 
+    /// Casts to a pointer of another type.
+    #[stable(feature = "ptr_cast", since = "1.38.0")]
+    #[rustc_const_stable(feature = "const_ptr_cast", since = "1.38.0")]
+    #[rustc_diagnostic_item = "const_ptr_cast"]
+    #[inline(always)]
+    #[cfg(not(bootstrap))]
+    pub const fn cast<U: ?Sized>(self) -> *const U
+    where
+        T: PointerCast<U>,
+    {
+        self as _
+    }
+
     /// Use the pointer value in a new pointer of another type.
     ///
     /// In case `meta` is a (fat) pointer to an unsized type, this operation

library/core/src/ptr/mut_ptr.rs

@@ -57,10 +57,24 @@ impl<T: ?Sized> *mut T {
     #[rustc_const_stable(feature = "const_ptr_cast", since = "1.38.0")]
     #[rustc_diagnostic_item = "ptr_cast"]
     #[inline(always)]
+    #[cfg(bootstrap)]
     pub const fn cast<U>(self) -> *mut U {
         self as _
     }
 
+    /// Casts to a pointer of another type.
+    #[stable(feature = "ptr_cast", since = "1.38.0")]
+    #[rustc_const_stable(feature = "const_ptr_cast", since = "1.38.0")]
+    #[rustc_diagnostic_item = "ptr_cast"]
+    #[inline(always)]
+    #[cfg(not(bootstrap))]
+    pub const fn cast<U: ?Sized>(self) -> *mut U
+    where
+        T: PointerCast<U>,
+    {
+        self as _
+    }
+
     /// Use the pointer value in a new pointer of another type.
     ///
     /// In case `meta` is a (fat) pointer to an unsized type, this operation