code: func isCDtorConversion(a AST) bool {
  	switch a := a.(type) {
  	case *Qualified:
  		return isCDtorConversion(a.Name)
  	case *Constructor, *Destructor, *Cast:
  		return true
  	default:
  		return false
  	}
  }
docs: // isCDtorConversion returns when an AST is a constructor, a
  // destructor, or a conversion operator.