Decision tree

dt.yaml

specializations:
- - Nil{}
  - action: 1
    variables:
    - - 0
      - 0
- - Cons{}
  - specializations: []
    default:
      swap:
      - 1                                                                        - specializations:
        - - Nil{}                                                                  - action: 2                                                                  variables:
            - - 4
              - 1
        - - Cons{}
          - action: 3
            variables:
            - - 0
              - 1
            - - 0
              - 2
        default: null
default: fail