error[E0080]: unable to read parts of a pointer from memory at ALLOC0
  --> $DIR/ptr_fragments_mixed.rs:20:25
   |
LL | const APTR: *const u8 = mix_ptr();
   |                         ^^^^^^^^^ evaluation of `APTR` failed inside this call
   |
   = help: this code performed an operation that depends on the underlying bytes representing a pointer
   = help: the absolute address of a pointer is not known at compile-time, so such operations are not supported
note: inside `mix_ptr`
  --> $DIR/ptr_fragments_mixed.rs:11:9
   |
LL | /         core::ptr::copy_nonoverlapping(
LL | |             (&raw const x).cast::<u8>(),
LL | |             (&raw mut y).cast::<u8>(),
LL | |             HALF_PTR,
LL | |         );
   | |_________^
note: inside `std::ptr::copy_nonoverlapping::<u8>`
  --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0080`.