- // 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);                 // scope 0 at $DIR/cast.rs:4:9: 4:10
-         _1 = const 42_u8 as u32 (Misc);  // scope 0 at $DIR/cast.rs:4:13: 4:24
+         _1 = const 42_u32;               // scope 0 at $DIR/cast.rs:4:13: 4:24
          StorageLive(_2);                 // scope 1 at $DIR/cast.rs:6:9: 6:10
-         _2 = const 42_u32 as u8 (Misc);  // scope 1 at $DIR/cast.rs:6:13: 6:24
+         _2 = const 42_u8;                // scope 1 at $DIR/cast.rs:6:13: 6:24
          nop;                             // scope 0 at $DIR/cast.rs:3:11: 7:2
          StorageDead(_2);                 // scope 1 at $DIR/cast.rs:7:1: 7:2
          StorageDead(_1);                 // scope 0 at $DIR/cast.rs:7:1: 7:2
          return;                          // scope 0 at $DIR/cast.rs:7:2: 7:2
      }
  }