proc charArg(conf: ConfigRef; n: PNode; name: string; pos: int; default: char): char {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

proc strArg(conf: ConfigRef; n: PNode; name: string; pos: int; default: string): string {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

proc boolArg(conf: ConfigRef; n: PNode; name: string; pos: int; default: bool): bool {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

proc filterStrip(conf: ConfigRef; stdin: PLLStream; filename: AbsoluteFile;
                 call: PNode): PLLStream {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

proc filterReplace(conf: ConfigRef; stdin: PLLStream; filename: AbsoluteFile;
                   call: PNode): PLLStream {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}