ArgFiller = object
  slots: seq[Slot]
  counts: CountTableRef[SlotKind]

FillChannel = tuple[idx: Slice[int], dest: string, kind: SlotKind]

SlotKind = enum
  Required, Optional, Wildcard

proc channels(filler; nargs: int): seq[FillChannel] {....raises: [], tags: [].}

proc generate(filler; containerName: string): NimNode {....raises: [], tags: [].}

proc hasVariableArgs(filler): bool {....raises: [], tags: [].}

proc hasWildcard(filler): bool {....raises: [], tags: [].}

proc minArgs(filler): int {....raises: [], tags: [].}

proc missing(filler; nargs: int): seq[string] {....raises: [], tags: [].}

proc newArgFiller(): ref ArgFiller {....raises: [], tags: [].}

proc numArgsAfterWildcard(filler): int {....raises: [], tags: [].}

proc optional(filler; argname: string) {....raises: [], tags: [].}

proc required(filler; argname: string; nargs = 1) {....raises: [], tags: [].}

proc upperBreakpoint(filler): int {....raises: [], tags: [].}

proc wildcard(filler; argname: string) {....raises: [ValueError], tags: [].}