proc hashTree(n: PNode): Hash {....raises: [KeyError, ValueError, Exception,
    OSError], tags: [RootEffect, ReadEnvEffect, ReadIOEffect, ReadDirEffect],
                                forbids: [].}

proc nodeTableGet(t: TNodeTable; key: PNode): int {.
    ...raises: [KeyError, ValueError, Exception, OSError],
    tags: [RootEffect, ReadEnvEffect, ReadIOEffect, ReadDirEffect], forbids: [].}

proc nodeTablePut(t: var TNodeTable; key: PNode; val: int) {.
    ...raises: [KeyError, ValueError, Exception, OSError],
    tags: [RootEffect, ReadEnvEffect, ReadIOEffect, ReadDirEffect], forbids: [].}

proc nodeTableTestOrSet(t: var TNodeTable; key: PNode; val: int): int {.
    ...raises: [KeyError, ValueError, Exception, OSError],
    tags: [RootEffect, ReadEnvEffect, ReadIOEffect, ReadDirEffect], forbids: [].}