interface Intf {
  field: String
}

type Object implements Intf & Intf {
  field: String
}

type Extended implements Intf {
  field: String
}
extend type Extended implements Intf

interface SubIntf implements Intf & Intf {
  field: String
}

# TODO(@goto-bus-stop): support interface extensions in validation
# interface ExtendedIntf implements Intf {
#   field: String
# }
# extend interface ExtendedIntf implements Intf

type Query {
  x: Int
}