Type inference for structural polymorphism —i.e. record and variant polymorphism— has been an active area of research since more than 10 years ago, and many results have been obtained. However these results are yet to be applied to real programming languages. Based on our experience with the Objective Label system, we describe how variant polymorphism can be integrated in a programming language, and what are the benefits. We give a detailed account of our type inference and compilation schemes.