[libcxx-commits] [libcxx] [libc++] Fix the mdspan ElementType complete object type mandate (PR #191703)

[A. Jiang via libcxx-commits]

================
@@ -23,6 +23,46 @@ class AbstractClass {
   virtual void method() = 0;
 };
 
+struct BadAccessor {
+  using offset_policy    = BadAccessor;
----------------
frederick-vs-ja wrote:

Perhaps we should also test the case for an incomplete class type. Now I think it would make more sense to rename this to `VoidAccessor`.
```suggestion
struct VoidAccessor {
  using offset_policy    = VoidAccessor;
```

https://github.com/llvm/llvm-project/pull/191703