have_file?

# File lib/rubygems/basic_specification.rb, line 319
  def have_file? file, suffixes
    return true if raw_require_paths.any? do |path|
      base = File.join(gems_dir, full_name, path.untaint, file).untaint
      suffixes.any? { |suf| File.file? base + suf }
    end

    if have_extensions?
      base = File.join extension_dir, file
      suffixes.any? { |suf| File.file? base + suf }
    else
      false
    end
  end