- // MIR for `main` before GVN
+ // MIR for `main` after GVN
  
  fn main() -> () {
      let mut _0: ();
      let _1: A;
      let mut _2: std::boxed::Box<[bool]>;
      scope 1 {
          debug a => _1;
      }
      scope 2 (inlined <Box<[bool]> as Default>::default) {
          let _3: std::ptr::Unique<[bool]>;
          let mut _4: std::ptr::Unique<[bool; 0]>;
          scope 3 {
              debug ptr => _3;
          }
          scope 4 (inlined Unique::<[bool; 0]>::dangling) {
              let mut _5: std::ptr::NonNull<[bool; 0]>;
              scope 5 (inlined NonNull::<[bool; 0]>::dangling) {
                  let mut _7: usize;
                  scope 6 {
                      let _6: *mut [bool; 0];
                      scope 7 {
                          debug ptr => _6;
                          scope 11 (inlined NonNull::<[bool; 0]>::new_unchecked) {
                              debug ptr => _6;
                              let mut _8: *const [bool; 0];
                              scope 12 {
                                  scope 13 (inlined NonNull::<T>::new_unchecked::runtime::<[bool; 0]>) {
                                      debug ptr => _6;
                                      scope 14 (inlined std::ptr::mut_ptr::<impl *mut [bool; 0]>::is_null) {
                                          debug self => _6;
                                          let mut _9: *mut u8;
                                          scope 15 {
                                              scope 16 (inlined std::ptr::mut_ptr::<impl *mut T>::is_null::runtime_impl) {
                                                  debug ptr => _9;
                                                  scope 17 (inlined std::ptr::mut_ptr::<impl *mut u8>::addr) {
                                                      debug self => _9;
                                                      scope 18 {
                                                          scope 19 (inlined std::ptr::mut_ptr::<impl *mut u8>::cast::<()>) {
                                                              debug self => _9;
                                                          }
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                  }
                              }
                          }
                      }
                      scope 8 (inlined align_of::<[bool; 0]>) {
                      }
                      scope 9 (inlined invalid_mut::<[bool; 0]>) {
                          debug addr => _7;
                          scope 10 {
                          }
                      }
                  }
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          StorageLive(_2);
          StorageLive(_3);
          StorageLive(_4);
          StorageLive(_5);
          StorageLive(_6);
          StorageLive(_7);
-         _7 = AlignOf([bool; 0]);
-         _6 = _7 as *mut [bool; 0] (Transmute);
+         _7 = const 1_usize;
+         _6 = const {0x1 as *mut [bool; 0]};
          StorageDead(_7);
          StorageLive(_8);
          StorageLive(_9);
-         _8 = _6 as *const [bool; 0] (PointerCoercion(MutToConstPointer));
+         _8 = const {0x1 as *mut [bool; 0]} as *const [bool; 0] (PointerCoercion(MutToConstPointer));
          _5 = NonNull::<[bool; 0]> { pointer: _8 };
          StorageDead(_9);
          StorageDead(_8);
          StorageDead(_6);
          _4 = Unique::<[bool; 0]> { pointer: move _5, _marker: const PhantomData::<[bool; 0]> };
          StorageDead(_5);
          _3 = move _4 as std::ptr::Unique<[bool]> (PointerCoercion(Unsize));
          StorageDead(_4);
          _2 = Box::<[bool]>(_3, const std::alloc::Global);
          StorageDead(_3);
          _1 = A { foo: move _2 };
          StorageDead(_2);
          _0 = const ();
          drop(_1) -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          StorageDead(_1);
          return;
      }
  }