proc nodeTableGet(t: TNodeTable; key: PNode): int {...}{.raises: [Exception],
    tags: [RootEffect].}

proc nodeTablePut(t: var TNodeTable; key: PNode; val: int) {...}{.
    raises: [Exception], tags: [RootEffect].}

proc nodeTableTestOrSet(t: var TNodeTable; key: PNode; val: int): int {...}{.
    raises: [Exception], tags: [RootEffect].}