module ActionDispatch::Routing::Mapper::Base

def mount(app, options = nil)
  if options
    path = options.delete(:at)
  else
    options = app
    app, path = options.find { |k, v| k.respond_to?(:call) }
    options.delete(app) if app
  end
  raise "A rack application must be specified" unless path
  match(path, options.merge(:to => app, :anchor => false, :format => false))
  self
end