error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:19:16
   |
LL |     let _num = &mut *(num as *const i32 as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[deny(invalid_reference_casting)]` on by default

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:21:16
   |
LL |     let _num = &mut *(num as *const i32).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:23:16
   |
LL |     let _num = &mut *std::ptr::from_ref(num).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:25:16
   |
LL |     let _num = &mut *std::ptr::from_ref({ num }).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:27:16
   |
LL |     let _num = &mut *{ std::ptr::from_ref(num) }.cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:29:16
   |
LL |     let _num = &mut *(std::ptr::from_ref({ num }) as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:31:16
   |
LL |     let _num = &mut *(num as *const i32).cast::<i32>().cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:33:16
   |
LL |     let _num = &mut *(num as *const i32).cast::<i32>().cast_mut().cast_const().cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:35:16
   |
LL |     let _num = &mut *(std::ptr::from_ref(static_u8()) as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:37:16
   |
LL |     let _num = &mut *std::mem::transmute::<_, *mut i32>(num);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:41:16
   |
LL |     let deferred = num as *const i32 as *mut i32;
   |                    ----------------------------- casting happend here
LL |     let _num = &mut *deferred;
   |                ^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:44:16
   |
LL |     let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
   |                    ---------------------------------------------------------------------------- casting happend here
LL |     let _num = &mut *deferred;
   |                ^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:46:16
   |
LL |     let _num = &mut *(num as *const _ as usize as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:50:9
   |
LL |         &mut *((this as *const _) as *mut _)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:60:5
   |
LL |     *(a as *const _ as *mut _) = String::from("Replaced");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:62:5
   |
LL |     *(a as *const _ as *mut String) += " world";
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:64:5
   |
LL |     *std::ptr::from_ref(num).cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:66:5
   |
LL |     *std::ptr::from_ref({ num }).cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:68:5
   |
LL |     *{ std::ptr::from_ref(num) }.cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:70:5
   |
LL |     *(std::ptr::from_ref({ num }) as *mut i32) += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:72:5
   |
LL |     *std::mem::transmute::<_, *mut i32>(num) += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:74:5
   |
LL | /     std::ptr::write(
LL | |
LL | |         std::mem::transmute::<*const i32, *mut i32>(num),
LL | |         -1i32,
LL | |     );
   | |_____^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:81:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happend here
LL |     *value = 1;
   |     ^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:83:5
   |
LL |     *(num as *const i32).cast::<i32>().cast_mut() = 2;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:85:5
   |
LL |     *(num as *const _ as usize as *mut i32) = 2;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:87:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happend here
...
LL |     std::ptr::write(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:89:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happend here
...
LL |     std::ptr::write_unaligned(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:91:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happend here
...
LL |     std::ptr::write_volatile(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:95:9
   |
LL |         *(this as *const _ as *mut _) = a;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 29 previous errors