type Human {
  name: String!
}

type Query {
  human: Human
}

query {
  human {
    ...fragA
  }
  __schema {
    types {
      ...cycle1
    }
  }
}

fragment fragA on Human {
  name
  ...fragB
}

fragment fragB on Human {
  name
  ...fragC
}

fragment fragC on Human {
  name
  ...fragA
}

fragment cycle1 on __Type {
  kind
  ...cycle2
}

fragment cycle2 on __Type {
  kind
  ofType {
    ...cycle1
  }
}