- // MIR for `main` before CopyProp
+ // MIR for `main` after CopyProp
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: i32;
      let mut _4: i32;
      let _5: ();
      let mut _6: i32;
      scope 1 {
          debug x => _1;
          let _2: i32;
          scope 2 {
              debug y => _2;
              let _3: i32;
              scope 3 {
-                 debug z => _3;
+                 debug z => _2;
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          _1 = val() -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
-         StorageLive(_2);
          _2 = _1;
-         StorageLive(_3);
-         _3 = _2;
-         StorageLive(_4);
-         _4 = _3;
-         _1 = move _4;
-         StorageDead(_4);
+         _1 = _2;
          StorageLive(_5);
          StorageLive(_6);
          _6 = _1;
          _5 = std::mem::drop::<i32>(move _6) -> [return: bb2, unwind unreachable];
      }
  
      bb2: {
          StorageDead(_6);
          StorageDead(_5);
          _0 = const ();
-         StorageDead(_3);
-         StorageDead(_2);
          StorageDead(_1);
          return;
      }
  }