[
    ApolloDiagnostic {
        cache: {
            0: "built_in_types.graphql",
            79: "0082_introspection_types_in_mutation.graphql",
        },
        location: DiagnosticLocation {
            file_id: FileId {
                id: 79,
            },
            offset: 202,
            length: 99,
        },
        labels: [
            Label {
                location: DiagnosticLocation {
                    file_id: FileId {
                        id: 79,
                    },
                    offset: 202,
                    length: 99,
                },
                text: "`__type` field is not defined",
            },
            Label {
                location: DiagnosticLocation {
                    file_id: FileId {
                        id: 79,
                    },
                    offset: 114,
                    length: 62,
                },
                text: "`MyMutationRootType` declared here",
            },
        ],
        help: Some(
            "`__type` is not defined on `MyMutationRootType` type",
        ),
        data: UndefinedField {
            field: "__type",
        },
    },
]
