class Middleman::CoreExtensions::Collections::StepContext

def method_missing(name, *args, &block)
  internal = :"_internal_#{name}"
  if respond_to?(internal)
    send(internal, *args, &block).tap do |r|
      @descriptors << r if r.respond_to?(:execute_descriptor)
    end
  else
    @app.config_context.send(name, *args, &block)
  end
end