Using Data.Typeable.typeOf we can get a representation of the the type of a monomorphic value, for instance Prelude Data.Typeable> typeOf not Bool -> Bool But if we try using it on a polymorphic value it fails Prelude Data.Typeable> typeOf id <interactive>:1:0: Ambiguous type variable `a' in the constraint: `Typeable a' arising from a use of `typeOf' at <interactive>:1:0-8 Probable fix: add a type signature that fixes these type variable(s) And understandably so. Does anyone know of a trick to accomplish `typeOf id'? Using something else than TypeRep as the representation, of course. Any tricks and existing language extensions are welcome. (As ghc moves towards first class polymorphic values this question gets more interesting.) -- Lennart