data StructDef = StructDef {
   structDefDoc        :: Text
 , structDefTypeFun    :: TypeFun
 , structDefIsAbstract :: Bool
 , structDefIsEnum     :: Bool
 , structDefMinVersion :: Maybe Version
 , structDefMaxVersion :: Maybe Version
 , structDefOptions    :: [Text]
 , structDefItems      :: [StructItem]
 } deriving (Eq, Show)
emptyStructDef = StructDef {
   structDefDoc        = ""
 , structDefTypeFun    = TypeFun (Name "") []
 , structDefIsAbstract = False
 , structDefIsEnum     = False
 , structDefMinVersion = Nothing
 , structDefMaxVersion = Nothing
 , structDefOptions    = []
 , structDefItems      = []
 }