---
- name: Anchors in Mapping
  from: NimYAML tests
  tags: anchor mapping
  yaml: |
    &a a: b
    c: &d d
  tree: |
    +STR
     +DOC
      +MAP
       =VAL &a :a
       =VAL :b
       =VAL :c
       =VAL &d :d
      -MAP
     -DOC
    -STR
  json: |
    {
      "a": "b",
      "c": "d"
    }