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: stdout_redirector_service.rb
    path of file: ./repos/dsu/lib/dsu/services
    
    the code of the file until where you have to start completion: # frozen_string_l
    
        def call
          raise ArgumentError, 'no block was provided' unless block_given?

          # The output stream must be an IO-like object. In this case we capture it in
          # an in-memory IO object so we can return the string value. Any IO object can
          # be used here.
          string_io = StringIO.new
          original_stdout, $stdout = $stdout, string_io # rubocop:disable Style/ParallelAssignment
          yield
          string_io.string
        ensure
          # Restore the original $stdout.
          $stdout = original_stdout
        end