- // MIR for `main` before GVN
+ // MIR for `main` after GVN
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: (i32, i32);
      scope 1 {
          debug x => _1;
          let _2: i32;
          scope 2 {
              debug y => _2;
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = foo() -> [return: bb1, unwind continue];
      }
  
      bb1: {
          (_1.1: i32) = const 99_i32;
          (_1.0: i32) = const 42_i32;
          StorageLive(_2);
          _2 = copy (_1.1: i32);
          _0 = const ();
          StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }