You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: file_access.rb
    path of file: ./repos/spektr/lib/spektr/checks
    
    the code of the file until where you have to start completion: module Spektr
  class Checks
    class FileA
    
      def check_calls_for_user_input(calls)
        calls.each do |call|
          call.arguments.each do |argument|
            if user_input?(argument.type, argument.name, argument.ast)
              warn! @target, self, call.location, "#{argument.name} is used for a filename, which enables an attacker to access arbitrary files."
            end
          end
        end