Optional[T] = object
  value*: T
  reason*: string
  isErr: bool
  isWarning: bool

proc error[T](self: Optional[T]; reason: string): Optional[T]

proc some[T](self: Optional[T]; value: T; warning = ""): Optional[T]

func isError(self: Optional): bool {...}{.inline.}

func isOkay(self: Optional): bool {...}{.inline.}

func isWarning(self: Optional): bool {...}{.inline.}

func reason(self: Optional): string {...}{.inline.}

func value[T](self: Optional[T]): T {...}{.inline.}

template warning(self: Optional): string

template with_value[T](self: Optional[T]; valname, blk: untyped): untyped

template with_value_mut[T](self: Optional[T]; valname, blk: untyped): untyped