RegexError = object of ValueError

invalidRune = -1'i32

lineBreakRune = 10'i32

proc toRune(s: string): Rune {...}{.raises: [], tags: [].}

proc `<=`(x, y: Rune): bool {...}{.raises: [], tags: [].}

proc cmp(x, y: Rune): int {...}{.raises: [], tags: [].}

func bwRuneAt(s: string; n: int): Rune {...}{.raises: [], tags: [].}

proc `%%`(formatstr: string; a: openArray[string]): string {...}{.noSideEffect,
    raises: [], tags: [].}

proc `%%`(formatstr: string; a: string): string {...}{.raises: [], tags: [].}

template bwFastRuneAt(s: string; n: var int; result: var Rune): untyped