You can&#x27;t, not with Haskell.  (Maybe you can, I don&#x27;t know, with some really insane extensions and type-level programming.  It wouldn&#x27;t be nice.)  Haskell&#x27;s approach is: write out the typeclass and the implementations, and you can probably safely assume that the &quot;natural&quot; implementation of the typeclass will satisfy the laws.<p>Dependently typed languages are what you use for this kind of thing.