anchor.diff:        - reference: .web_server.example_disk_type_dropdown
           label: Example disk type dropdown
           description: 'The larger the disk the more cookies we store'
  +      - reference: .web_server.example_stemcell_selector
  +        label: Example stemcell selector
  +        description: 'Select which stemcell you want to use'
     - name: example_collections_form
       label: 'Collection example'
       description: 'A collection example form'
  
positive.code:   #
    # default: true
    enable_patch_security_updates: true
  releases:
    - name: example-release
      file: <%= release_file_name.inspect %>
  
negative.code:       resource_definitions:
        - name: persistent_disk
          default: 2000
      - type: stemcell_selector
        name: example_stemcell_selector
        configurable: true
      manifest: |
        credhub:
          concatenated_password: prefix-((( credhub-password )))-suffix
  