What is natural Haskell representation of such enum?

enum TypeMask
{
UNIT,
GAMEOBJECT,

CREATURE_OR_GAMEOBJECT = UNIT | GAMEOBJECT
};

More sophisticated question is: and what data structures must be used when converting this naturally one to Haskell?

// 1-byte flaged enum
enum TypeMask
{
// ...
UNIT = 0x0004,
GAMEOBJECT = 0x0008,
// ...

CREATURE_OR_GAMEOBJECT = UNIT | GAMEOBJECT

WORLDOBJECT = UNIT | PLAYER | GAMEOBJECT | DYNAMICOBJECT | CORPSE

// ... even more enum combos ...

};