---
- name: Spec Example 7.3. Completely Empty Flow Nodes
  from: http://www.yaml.org/spec/1.2/spec.html#id2786868
  tags: empty-key explicit-key spec flow mapping
  yaml: |
    {
      ? foo :,
      : bar,
    }
  tree: |
    +STR
     +DOC
      +MAP {}
       =VAL :foo
       =VAL :
       =VAL :
       =VAL :bar
      -MAP
     -DOC
    -STR