code: func (s *Stubs) ResetSingle(varToStub interface{}) {
  	v := reflect.ValueOf(varToStub)
  	originalVal, ok := s.stubs[v]
  	if !ok {
  		panic("cannot reset variable as it has not been stubbed yet")
  	}
  
  	v.Elem().Set(originalVal)
  }
docs: // ResetSingle resets a single stubbed variable back to its original value.