- // MIR for `unreachable_box` before ConstProp
+ // MIR for `unreachable_box` after ConstProp
  
  fn unreachable_box() -> ! {
      let mut _0: !;                       // return place in scope 0 at $DIR/transmute.rs:+0:36: +0:37
      let mut _1: !;                       // in scope 0 at $DIR/transmute.rs:+0:38: +3:2
      let _2: std::boxed::Box<Never>;      // in scope 0 at $DIR/transmute.rs:+1:9: +1:10
      let mut _3: !;                       // in scope 0 at $DIR/transmute.rs:+2:5: +2:16
      scope 1 {
          debug x => _2;                   // in scope 1 at $DIR/transmute.rs:+1:9: +1:10
      }
      scope 2 {
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/transmute.rs:+0:38: +3:2
          StorageLive(_2);                 // scope 0 at $DIR/transmute.rs:+1:9: +1:10
-         _2 = const 1_usize as std::boxed::Box<Never> (Transmute); // scope 2 at $DIR/transmute.rs:+1:34: +1:52
+         _2 = const Box::<Never>(Unique::<Never> {{ pointer: NonNull::<Never> {{ pointer: {0x1 as *const Never} }}, _marker: PhantomData::<Never> }}, std::alloc::Global); // scope 2 at $DIR/transmute.rs:+1:34: +1:52
+                                          // mir::Constant
+                                          // + span: no-location
+                                          // + literal: Const { ty: Box<Never>, val: Value(Scalar(0x0000000000000001)) }
          StorageLive(_3);                 // scope 1 at $DIR/transmute.rs:+2:5: +2:16
          unreachable;                     // scope 1 at $DIR/transmute.rs:+2:11: +2:13
      }
  }