Procs

proc uuid1(): string {....raises: [Exception, ValueError, OSError, IOError,
                                EOFError, KeyError], tags: [RootEffect].}

proc uuid4(): string {....raises: [Exception, ValueError, OSError, IOError,
                                EOFError, KeyError], tags: [RootEffect].}

proc uuid3(namespace, name: string): string {.
    ...raises: [Exception, ValueError, OSError, IOError, EOFError, KeyError],
    tags: [RootEffect].}

proc uuid5(namespace, name: string): string {.
    ...raises: [Exception, ValueError, OSError, IOError, EOFError, KeyError],
    tags: [RootEffect].}