UnknownReason(String descriptionTemplate, String reason, String solution) {
            this.descriptionTemplate = descriptionTemplate;
            this.reason = reason;
            this.solution = solution;
        }
    }

    private final UnknownReason unknownReason;

    public UnknownImplementationSnapshot(String typeName, UnknownReason unknownReason) {
        super(typeName);

                UnknownImplementationSnapshot.UnknownReason unknownReason = UnknownImplementationSnapshot.UnknownReason.values()[decoder.readSmallInt()];
                return new UnknownImplementationSnapshot(classIdentifier, unknownReason);
            }

            @Override

            return new UnknownImplementationSnapshot(classIdentifier, UnknownReason.UNKNOWN_CLASSLOADER);
        }

        if (isLambda) {
            return serializedLambdaFor(value)
                .<ImplementationSnapshot>map(it -> new LambdaImplementationSnapshot(classLoaderHash, it))
                .orElseGet(() -> new UnknownImplementationSnapshot(classIdentifier, UnknownReason.UNTRACKED_LAMBDA));
        }

        expect:
        ImplementationSnapshot copy = written as ImplementationSnapshot
        copy.classIdentifier == original.classIdentifier
        copy.classLoaderHash == null
        copy.unknownReason == UnknownImplementationSnapshot.UnknownReason.UNKNOWN_CLASSLOADER
    }

    def "serializes implementation properties with untracked lambda"() {