contains_requirable_file?

# File lib/rubygems/basic_specification.rb, line 55
  def contains_requirable_file? file
    build_extensions

    suffixes = Gem.suffixes

    full_require_paths.any? do |dir|
      base = "#{dir}/#{file}"
      suffixes.any? { |suf| File.file? "#{base}#{suf}" }
    end
  end