error: encountered partial pointer in final value of constant
  --> $DIR/ptr_fragments_in_final.rs:15:1
   |
LL | const MEMCPY_RET: MaybeUninit<*const i32> = unsafe {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: while pointers can be broken apart into individual bytes during const-evaluation, only complete pointers (with all their bytes in the right order) are supported in the final value

error: aborting due to 1 previous error