proc extractArcExpansion(output: string; procName: string): string {....raises: [],
    tags: [], forbids: [].}

proc extractMacroExpansion(output: string; targetLine: int): string {.
    ...raises: [], tags: [WriteIOEffect], forbids: [].}

proc nimExpandArc(nimPath: string; suggest: Suggest; filePath: string): Future[
    string] {....stackTrace: false, raises: [], gcsafe, tags: [RootEffect],
              forbids: [].}

proc nimExpandMacro(nimPath: string; suggest: Suggest; filePath: string): Future[
    string] {....stackTrace: false, raises: [], gcsafe, tags: [RootEffect],
              forbids: [].}