calls.nrvo.CopyProp.diff

- // MIR for `nrvo` before CopyProp
+ // MIR for `nrvo` after CopyProp
  
  fn nrvo() -> u8 {
      let mut _0: u8;
      let _1: u8;
      scope 1 {
-         debug y => _1;
+         debug y => _0;
      }
  
      bb0: {
-         StorageLive(_1);
-         _1 = dummy(const 5_u8) -> [return: bb1, unwind continue];
+         _0 = dummy(const 5_u8) -> [return: bb1, unwind continue];
      }
  
      bb1: {
-         _0 = _1;
-         StorageDead(_1);
          return;
      }
  }