error: any use of this value will cause an error
  --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
   |
LL |           copy_nonoverlapping(src, tmp.as_mut_ptr(), 1);
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |           |
   |           unable to turn pointer into raw bytes
   |           inside `std::ptr::read::<u8>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL
   |           inside `ptr::const_ptr::<impl *const u8>::read` at $SRC_DIR/core/src/ptr/const_ptr.rs:LL:COL
   |           inside `C` at $DIR/issue-miri-1910.rs:8:5
   |
  ::: $DIR/issue-miri-1910.rs:5:1
   |
LL | / const C: () = unsafe {
LL | |     let foo = Some(&42 as *const i32);
LL | |     let one_and_a_half_pointers = std::mem::size_of::<*const i32>()/2*3;
LL | |     (&foo as *const _ as *const u8).add(one_and_a_half_pointers).read();
LL | | };
   | |__-
   |
   = note: `#[deny(const_err)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>

error: aborting due to previous error