error[E0658]: unsizing casts to types besides slices are not allowed in const fn
  --> $DIR/unsizing-cast-non-null.rs:6:5
   |
LL |     NonNull::<[T; 0]>::dangling()
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #64992 <https://github.com/rust-lang/rust/issues/64992> for more information
   = help: add `#![feature(const_fn_unsize)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.