proc addDotDependency(c: PPassContext; n: PNode): PNode {....raises: [],
    tags: [ReadEnvEffect], forbids: [].}

proc generateDot(graph: ModuleGraph; project: AbsoluteFile) {....raises: [IOError],
    tags: [WriteIOEffect], forbids: [].}

proc setupDependPass(graph: ModuleGraph; module: PSym; idgen: IdGenerator): PPassContext {.
    ...raises: [], tags: [], forbids: [].}