message: Unnecessary reset calls
  Summary:
  Bumpalo releases memory on drop.
  I don't know why code exists here, and I delete code I don't understand.
diff: @@ -427,8 +427,6 @@ impl Drop for Arena {
  let value = x.payload_ptr() as *mut ();
  x.0.drop_in_place(value);
  });
  - self.non_drop.reset();
  - self.drop.reset();
  }
  }
  