tsort_each_child

# File lib/rubygems/request_set.rb, line 391
  def tsort_each_child node # :nodoc:
    node.spec.dependencies.each do |dep|
      next if dep.type == :development and not @development

      match = @requests.find { |r|
        dep.match? r.spec.name, r.spec.version, @prerelease
      }

      unless match then
        next if dep.type == :development and @development_shallow
        next if @soft_missing
        raise Gem::DependencyError,
              "Unresolved dependency found during sorting - #{dep} (requested by #{node.spec.full_name})"
      end

      yield match
    end
  end