tests/ui/lint/reference_casting.stderr

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:32:16
   |
LL |     let _num = &mut *(num as *const i32 as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
   = 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:34:16
   |
LL |     let _num = &mut *(num as *const i32).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:36:16
   |
LL |     let _num = &mut *std::ptr::from_ref(num).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:38:16
   |
LL |     let _num = &mut *std::ptr::from_ref({ num }).cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:40:16
   |
LL |     let _num = &mut *{ std::ptr::from_ref(num) }.cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:42:16
   |
LL |     let _num = &mut *(std::ptr::from_ref({ num }) as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

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 _num = &mut *(num as *const i32).cast::<i32>().cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

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 i32).cast::<i32>().cast_mut().cast_const().cast_mut();
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:48:16
   |
LL |     let _num = &mut *(std::ptr::from_ref(static_u8()) as *mut i8);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:50:16
   |
LL |     let _num = &mut *std::mem::transmute::<_, *mut i32>(num);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:52:16
   |
LL |     let _num = &mut *(std::mem::transmute::<_, *mut i32>(num) as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:54:16
   |
LL |       let _num = &mut *std::cell::UnsafeCell::raw_get(
   |  ________________^
LL | |
LL | |         num as *const i32 as *const std::cell::UnsafeCell<i32>,
LL | |     );
   | |_____^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:60:16
   |
LL |     let deferred = num as *const i32 as *mut i32;
   |                    ----------------------------- casting happened here
LL |     let _num = &mut *deferred;
   |                ^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:63:16
   |
LL |     let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
   |                    ---------------------------------------------------------------------------- casting happened here
LL |     let _num = &mut *deferred;
   |                ^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:66:16
   |
LL |     let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
   |                    ---------------------------------------------------------------------------- casting happened here
...
LL |     let _num = &mut *deferred_rebind;
   |                ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:68:16
   |
LL |     let _num = &mut *(num as *const _ as usize as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:70:16
   |
LL |     let _num = &mut *(std::mem::transmute::<_, *mut _>(num as *const i32) as *mut i32);
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:77:16
   |
LL |     let num = NUM as *const i32 as *mut i32;
   |               ----------------------------- casting happened here
...
LL |     let _num = &mut *num;
   |                ^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:81:9
   |
LL |         &mut *((this as *const _) as *mut _)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:86:18
   |
LL |         unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:91:18
   |
LL |         unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:97:18
   |
LL |         let t = ptr as *const Option<T> as *mut T;
   |                 --------------------------------- casting happened here
LL |         unsafe { &mut *t }
   |                  ^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:103:18
   |
LL |         let t = ptr as *const Option<UnsafeCell<T>> as *mut T;
   |                 --------------------------------------------- casting happened here
LL |         unsafe { &mut *t }
   |                  ^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:109:18
   |
LL |         let t = ptr as *const (T, UnsafeCell<T>) as *mut T;
   |                 ------------------------------------------ casting happened here
LL |         unsafe { &mut *t }
   |                  ^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:115:18
   |
LL |         let t = ptr as *const _ as *mut [T];
   |                 --------------------------- casting happened here
LL |         unsafe { &mut *t }
   |                  ^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:121:18
   |
LL |         let t = ptr as *const FakeUnsafeCell<T> as *mut T;
   |                 ----------------------------------------- casting happened here
LL |         unsafe { &mut *t }
   |                  ^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:131:5
   |
LL |     *(a as *const _ as *mut _) = String::from("Replaced");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:133:5
   |
LL |     *(a as *const _ as *mut String) += " world";
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:135:5
   |
LL |     *std::ptr::from_ref(num).cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:137:5
   |
LL |     *std::ptr::from_ref({ num }).cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:139:5
   |
LL |     *{ std::ptr::from_ref(num) }.cast_mut() += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:141:5
   |
LL |     *(std::ptr::from_ref({ num }) as *mut i32) += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:143:5
   |
LL |     *std::mem::transmute::<_, *mut i32>(num) += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:145:5
   |
LL |     *(std::mem::transmute::<_, *mut i32>(num) as *mut i32) += 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:147:5
   |
LL | /     std::ptr::write(
LL | |
LL | |         std::mem::transmute::<*const i32, *mut i32>(num),
LL | |         -1i32,
LL | |     );
   | |_____^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:154:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
LL |     *value = 1;
   |     ^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:158:5
   |
LL |     let value = value as *mut i32;
   |                 ----------------- casting happened here
LL |     *value = 1;
   |     ^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:161:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
LL |     *value = 1;
   |     ^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:164:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
...
LL |     *value_rebind = 1;
   |     ^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:166:5
   |
LL |     *(num as *const i32).cast::<i32>().cast_mut() = 2;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:168:5
   |
LL |     *(num as *const _ as usize as *mut i32) = 2;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:170:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
...
LL |     std::ptr::write(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:172:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
...
LL |     std::ptr::write_unaligned(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:174:5
   |
LL |     let value = num as *const i32 as *mut i32;
   |                 ----------------------------- casting happened here
...
LL |     std::ptr::write_volatile(value, 2);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
  --> $DIR/reference_casting.rs:178:9
   |
LL |         *(this as *const _ as *mut _) = a;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:200:20
   |
LL |         let num = &mut 3i32;
   |                        ---- backing allocation comes from here
LL |
LL |         let _num = &*(num as *const i32 as *const i64);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `i32` (4 bytes) to `i64` (8 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:202:20
   |
LL |         let num = &mut 3i32;
   |                        ---- backing allocation comes from here
...
LL |         let _num = &mut *(num as *mut i32 as *mut i64);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `i32` (4 bytes) to `i64` (8 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:204:20
   |
LL |         let num = &mut 3i32;
   |                        ---- backing allocation comes from here
...
LL |         let _num = &mut *(num as *mut i32 as *mut I64);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `i32` (4 bytes) to `I64` (16 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:206:9
   |
LL |         let num = &mut 3i32;
   |                        ---- backing allocation comes from here
...
LL |         std::ptr::write(num as *mut i32 as *mut i64, 2);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `i32` (4 bytes) to `i64` (8 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:215:20
   |
LL |         let num = &mut [0i32; 3];
   |                        --------- backing allocation comes from here
LL |
LL |         let _num = &mut *(num as *mut _ as *mut [i64; 2]);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `[i32; 3]` (12 bytes) to `[i64; 2]` (16 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:217:9
   |
LL |         let num = &mut [0i32; 3];
   |                        --------- backing allocation comes from here
...
LL |         std::ptr::write_unaligned(num as *mut _ as *mut [i32; 4], [0, 0, 1, 1]);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `[i32; 3]` (12 bytes) to `[i32; 4]` (16 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:227:20
   |
LL |         let num = &mut [0i32; 3] as &mut [i32];
   |                        --------- backing allocation comes from here
LL |
LL |         let _num = &mut *(num as *mut _ as *mut i128);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `[i32; 3]` (12 bytes) to `i128` (16 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:229:20
   |
LL |         let num = &mut [0i32; 3] as &mut [i32];
   |                        --------- backing allocation comes from here
...
LL |         let _num = &mut *(num as *mut _ as *mut [i64; 4]);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: casting from `[i32; 3]` (12 bytes) to `[i64; 4]` (32 bytes)

error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
  --> $DIR/reference_casting.rs:239:20
   |
LL |         let _num = &mut *(&mat3 as *const _ as *mut [[i64; 3]; 3]);
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:239:20
   |
LL |         let _num = &mut *(&mat3 as *const _ as *mut [[i64; 3]; 3]);
   |                    ^^^^^^^^----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |                            |
   |                            backing allocation comes from here
   |
   = note: casting from `Mat3<i32>` (36 bytes) to `[[i64; 3]; 3]` (72 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:242:20
   |
LL |         let _num = &*(&mat3 as *const _ as *mut [[i64; 3]; 3]);
   |                    ^^^^----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |                        |
   |                        backing allocation comes from here
   |
   = note: casting from `Mat3<i32>` (36 bytes) to `[[i64; 3]; 3]` (72 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:251:38
   |
LL |         let w: *mut [u16; 2] = &mut l as *mut [u8; 2] as *mut _;
   |                                --------------------------------
   |                                |    |
   |                                |    backing allocation comes from here
   |                                casting happened here
LL |         let w: *mut [u16] = unsafe { &mut *w };
   |                                      ^^^^^^^
   |
   = note: casting from `[u8; 2]` (2 bytes) to `[u16; 2]` (4 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:261:20
   |
LL |         let _num = &*(&num as *const i32 as *const i64);
   |                    ^^^^---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |                        |
   |                        backing allocation comes from here
   |
   = note: casting from `[i32; 1]` (4 bytes) to `i64` (8 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:263:20
   |
LL |         let _num = &*(&foo() as *const i32 as *const i64);
   |                    ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |                        |
   |                        backing allocation comes from here
   |
   = note: casting from `[i32; 1]` (4 bytes) to `i64` (8 bytes)

error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
  --> $DIR/reference_casting.rs:283:20
   |
LL |         let _num = &*(&num as *const i32 as *const i64);
   |                    ^^^^---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |                        |
   |                        backing allocation comes from here
   |
   = note: casting from `i32` (4 bytes) to `i64` (8 bytes)

error: aborting due to 60 previous errors