func hasDots(call *syntax.CallExpr) bool { return call.HasDots }

// dddErrPos returns the node (poser) for reporting an invalid ... use in a call.
func dddErrPos(call *syntax.CallExpr) *syntax.CallExpr {
	// TODO(gri) should use "..." instead of call position
	return call
}

// argErrPos returns the node (poser) for reporting an invalid argument count.
func argErrPos(call *syntax.CallExpr) *syntax.CallExpr { return call }

// is allowed to use version v. If the position is unknown, the specified
// module version (Config.GoVersion) is used. If that version is invalid,
// allowVersion returns true.
func (check *Checker) allowVersion(at poser, v goVersion) bool {
	fileVersion := check.conf.GoVersion
	if pos := at.Pos(); pos.IsKnown() {
		fileVersion = check.versions[pos.FileBase()]
	}

	// We need asGoVersion (which calls version.Lang) below

  // return false.
  //
  // TODO(sanjoy): Change this to take a typed std::function if that's
  // performance neutral.
  template <typename FnTy>
  void ForEach(FnTy func) const {
    // This is really a poor man's iterator, we should consider writing a proper
    // iterator if this ends up being used widely.
    for (int word_index = 0, end = storage_.size(); word_index < end;
         word_index++) {