-   kind: record
    fields: []
    id: [shadowing, '1', Buffer]
-   kind: record
    fields:
    -   name: y
        value:
            kind: reference
            to: [shadowing, '1', Buffer]
        required: true
    id: [shadowing, '1', Y]
-   kind: record
    fields:
    -   name: x
        value:
            kind: reference
            to: [Buffer]
        required: true
    id: [shadowing, X]