- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/cast.rs:3:11: 3:11
      let _1: u32;                         // in scope 0 at $DIR/cast.rs:4:9: 4:10
      scope 1 {
          debug x => _1;                   // in scope 1 at $DIR/cast.rs:4:9: 4:10
          let _2: u8;                      // in scope 1 at $DIR/cast.rs:6:9: 6:10
          scope 2 {
              debug y => _2;               // in scope 2 at $DIR/cast.rs:6:9: 6:10
          }
      }
  
      bb0: {
          StorageLive(_1);                 // bb0[0]: scope 0 at $DIR/cast.rs:4:9: 4:10
-         _1 = const 42u8 as u32 (Misc);   // bb0[1]: scope 0 at $DIR/cast.rs:4:13: 4:24
+         _1 = const 42u32;                // bb0[1]: scope 0 at $DIR/cast.rs:4:13: 4:24
                                           // ty::Const
-                                          // + ty: u8
-                                          // + val: Value(Scalar(0x2a))
-                                          // mir::Constant
-                                          // + span: $DIR/cast.rs:4:13: 4:17
-                                          // + literal: Const { ty: u8, val: Value(Scalar(0x2a)) }
-         StorageLive(_2);                 // bb0[2]: scope 1 at $DIR/cast.rs:6:9: 6:10
-         _2 = const 42u32 as u8 (Misc);   // bb0[3]: scope 1 at $DIR/cast.rs:6:13: 6:24
-                                          // ty::Const
                                           // + ty: u32
                                           // + val: Value(Scalar(0x0000002a))
                                           // mir::Constant
-                                          // + span: $DIR/cast.rs:6:13: 6:18
+                                          // + span: $DIR/cast.rs:4:13: 4:24
                                           // + literal: Const { ty: u32, val: Value(Scalar(0x0000002a)) }
+         StorageLive(_2);                 // bb0[2]: scope 1 at $DIR/cast.rs:6:9: 6:10
+         _2 = const 42u8;                 // bb0[3]: scope 1 at $DIR/cast.rs:6:13: 6:24
+                                          // ty::Const
+                                          // + ty: u8
+                                          // + val: Value(Scalar(0x2a))
+                                          // mir::Constant
+                                          // + span: $DIR/cast.rs:6:13: 6:24
+                                          // + literal: Const { ty: u8, val: Value(Scalar(0x2a)) }
          _0 = const ();                   // bb0[4]: scope 0 at $DIR/cast.rs:3:11: 7:2
                                           // ty::Const
                                           // + ty: ()
                                           // + val: Value(Scalar(<ZST>))
                                           // mir::Constant
                                           // + span: $DIR/cast.rs:3:11: 7:2
                                           // + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
          StorageDead(_2);                 // bb0[5]: scope 1 at $DIR/cast.rs:7:1: 7:2
          StorageDead(_1);                 // bb0[6]: scope 0 at $DIR/cast.rs:7:1: 7:2
          return;                          // bb0[7]: scope 0 at $DIR/cast.rs:7:2: 7:2
      }
  }