prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  [lang]
   +--@modal
   |   +--(.)feed
   |   `--(.)photos
   |       `--[id]
   +--feed
   `--photos
       `--[id]
  ```
  
  Convert this description:
  
  app is a core directory that includes 2 subdirectories: @slot and nested.
  At the main level, '@slot' is a scoped package with 1 components.
  Within directory hierarchy '@slot → (.)nested', The '(.)nested' collection is vacant.
  Back to the top level.
  At the main level, Inside 'nested', you'll find it has been left empty.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "app\n +--@slot\n |   `--(.)nested\n `--nested", "description": "app is a core directory that includes 2 subdirectories: @slot and nested.\nAt the main level, '@slot' is a scoped package with 1 components.\nWithin directory hierarchy '@slot \u2192 (.)nested', The '(.)nested' collection is vacant.\nBack to the top level.\nAt the main level, Inside 'nested', you'll find it has been left empty.\n"}