-derive gToStruct NInt, T, List, R, Muta, Mutb, (,), (), [], (,,)
-derive gPotInf NInt, T, List, R, Muta, Mutb, (,), (), [], (,,)
-
+derive gToStruct NInt, T, List, R, Muta, Mutb, (,), (), [], (,,), Maybe, Either
+derive gPotInf NInt, T, List, R, Muta, Mutb, (,), (), [], (,,), Maybe, Either