exportList :: String   -- ^ Module name.
           -> [String] -- ^ List of functions.
           -> String   -- ^ Resulting string.
exportList _    []            = error "exportList without functions."
exportList :: String   -- ^ Module name.
           -> [String] -- ^ List of functions.
           -> String
exportList _    []            = error "exportList without functions."
exportList _    []            = error "exportList without functions."