Implement PointerLike for isize, NonNull, Cell, UnsafeCell, and SyncUnsafeCell.

Implementing `PointerLike` for `UnsafeCell` enables the possibility of interior mutable `dyn*` values. Since this means potentially exercising new codegen behavior, I added a test for it in `tests/ui/dyn-star/cell.rs`. Also updated UI tests to account for the `isize` implementation changing error messages.

Author: kpreid

library/core/src/cell.rs

@@ -252,7 +252,7 @@
 
 use crate::cmp::Ordering;
 use crate::fmt::{self, Debug, Display};
-use crate::marker::{PhantomData, Unsize};
+use crate::marker::{PhantomData, PointerLike, Unsize};
 use crate::mem;
 use crate::ops::{CoerceUnsized, Deref, DerefMut, DerefPure, DispatchFromDyn};
 use crate::pin::PinCoerceUnsized;
@@ -677,6 +677,9 @@ impl<T: CoerceUnsized<U>, U> CoerceUnsized<Cell<U>> for Cell<T> {}
 #[unstable(feature = "dispatch_from_dyn", issue = "none")]
 impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<Cell<U>> for Cell<T> {}
 
+#[unstable(feature = "pointer_like_trait", issue = "none")]
+impl<T: PointerLike> PointerLike for Cell<T> {}
+
 impl<T> Cell<[T]> {
  /// Returns a `&[Cell<T>]` from a `&Cell<[T]>`
  ///
@@ -2258,6 +2261,9 @@ impl<T: CoerceUnsized<U>, U> CoerceUnsized<UnsafeCell<U>> for UnsafeCell<T> {}
 #[unstable(feature = "dispatch_from_dyn", issue = "none")]
 impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<UnsafeCell<U>> for UnsafeCell<T> {}
 
+#[unstable(feature = "pointer_like_trait", issue = "none")]
+impl<T: PointerLike> PointerLike for UnsafeCell<T> {}
+
 /// [`UnsafeCell`], but [`Sync`].
 ///
 /// This is just an `UnsafeCell`, except it implements `Sync`
@@ -2364,6 +2370,9 @@ impl<T: CoerceUnsized<U>, U> CoerceUnsized<SyncUnsafeCell<U>> for SyncUnsafeCell
 //#[unstable(feature = "sync_unsafe_cell", issue = "95439")]
 impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<SyncUnsafeCell<U>> for SyncUnsafeCell<T> {}
 
+#[unstable(feature = "pointer_like_trait", issue = "none")]
+impl<T: PointerLike> PointerLike for SyncUnsafeCell<T> {}
+
 #[allow(unused)]
 fn assert_coerce_unsized(
  a: UnsafeCell<&i32>,

library/core/src/marker.rs

@@ -997,6 +997,7 @@ pub trait PointerLike {}
 marker_impls! {
  #[unstable(feature = "pointer_like_trait", issue = "none")]
  PointerLike for
+ isize,
  usize,
  {T} &T,
  {T} &mut T,

library/core/src/ptr/non_null.rs

@@ -1548,6 +1548,10 @@ impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: U
 #[stable(feature = "pin", since = "1.33.0")]
 unsafe impl<T: ?Sized> PinCoerceUnsized for NonNull<T> {}
 
+#[unstable(feature = "pointer_like_trait", issue = "none")]
+#[cfg(not(bootstrap))]
+impl<T> core::marker::PointerLike for NonNull<T> {}
+
 #[stable(feature = "nonnull", since = "1.25.0")]
 impl<T: ?Sized> fmt::Debug for NonNull<T> {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

tests/ui/dyn-star/cell.rs

@@ -0,0 +1,34 @@
+// This test with Cell also indirectly exercises UnsafeCell in dyn*.
+//
+//@ run-pass
+
+#![feature(dyn_star)]
+#![allow(incomplete_features)]
+
+use std::cell::Cell;
+
+trait Rw<T> {
+ fn read(&self) -> T;
+ fn write(&self, v: T);
+}
+
+impl<T: Copy> Rw<T> for Cell<T> {
+ fn read(&self) -> T {
+ self.get()
+ }
+ fn write(&self, v: T) {
+ self.set(v)
+ }
+}
+
+fn make_dyn_star() -> dyn* Rw<usize> {
+ Cell::new(42usize) as dyn* Rw<usize>
+}
+
+fn main() {
+ let x = make_dyn_star();
+
+ assert_eq!(x.read(), 42);
+ x.write(24);
+ assert_eq!(x.read(), 24);
+}

tests/ui/dyn-star/error.rs

@@ -6,7 +6,7 @@ use std::fmt::Debug;
 trait Foo {}
 
 fn make_dyn_star() {
- let i = 42;
+ let i = 42usize;
  let dyn_i: dyn* Foo = i; //~ ERROR trait bound `usize: Foo` is not satisfied
 }
 

tests/ui/dyn-star/float-as-dyn-star.stderr

@@ -14,7 +14,9 @@ LL | f32::from_bits(0x1) as f64
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ `f64` needs to be a pointer-like type
  |
  = help: the trait `PointerLike` is not implemented for `f64`
- = help: the trait `PointerLike` is implemented for `usize`
+ = help: the following other types implement trait `PointerLike`:
+ isize
+ usize
 
 error: aborting due to 1 previous error; 1 warning emitted