- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: i32;
      scope 1 {
          debug x => _1;
          let _2: i32;
          scope 2 {
              debug y => _2;
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = const 42_i32;
          _1 = const 99_i32;
          StorageLive(_2);
-         _2 = _1;
+         _2 = const 99_i32;
          _0 = const ();
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }