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: code_block.rb
    path of file: ./repos/ruby/lib/syntax_suggest
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module SyntaxSuggest
  # Multiple lines form
    
    def valid?
      if @valid == UNSET
        # Performance optimization
        #
        # If all the lines were previously hidden
        # and we expand to capture additional empty
        # lines then the result cannot be invalid
        #
        # That means there's no reason to re-check all
        # lines with the parser (which is expensive).
        # Benchmark in commit message
        @valid = if lines.all? { |l| l.hidden? || l.empty? }
          true
        else
          SyntaxSuggest.valid?(lines.map(&:original).join)
        end