Procs

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

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

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