anchor.diff:  end
   
   class TestInheritanceApp < Eldr::App
  -  use SimpleCounterMiddleware
  -  set :bob, 'what about him?'
  +  use SimpleMiddleware
   end
   
   class InheritedApp < TestInheritanceApp
  
positive.code:     @env = env
  
      before_filters.each { |filter| filter.call(env) }
      response = handler.call(env)
      after_filters.each { |filter| filter.call(env) }
      response
    end
  end
  ```
  
  Let's add a spec to `spec/route_spec.rb`:
  
  ```ruby
  describe '#call' do
  
negative.code: 
    recognize(env).each do |route|
      env['eldr.route'] = route
      catch(:pass) { return route.call(env) }
    end
  rescue => error
    if error.respond_to? :call
  