proc parseGrammar(ns: NimNode; dot: Dot = nil; dumpRailroad = true): Grammar {.
    ...raises: [KeyError, Exception, NPegStackOverflowError], tags: [RootEffect],
    forbids: [].}

proc parsePatt(pattName: string; nn: NimNode; grammar: Grammar; dot: Dot = nil): Patt {.
    ...raises: [KeyError, Exception, NPegStackOverflowError], tags: [RootEffect],
    forbids: [].}