class Bundler::Definition

def expanded_dependencies

the metadata dependencies here
This list of dependencies is only used in #resolve, so it's OK to add 
def expanded_dependencies
  @expanded_dependencies ||= begin
    ruby_versions = concat_ruby_version_requirements(@ruby_version)
    if ruby_versions.empty? || !@ruby_version.exact?
      concat_ruby_version_requirements(RubyVersion.system)
      concat_ruby_version_requirements(locked_ruby_version_object) unless @unlock[:ruby]
    end
    metadata_dependencies = [
      Dependency.new("ruby\0", ruby_versions),
      Dependency.new("rubygems\0", Gem::VERSION),
    ]
    expand_dependencies(dependencies + metadata_dependencies, @remote)
  end
end