generated_always_as(length(&Object::name)) produces exception in sync_schema()

[juandent]

This code below causes exception in sync_schema() but the one below it doesn't (an important clue in solving it):

    struct Object {
        std::string name;
        int nameLen;
        int number;
    };
    constexpr int offset = 0;
    auto storage = make_storage("",
                                make_table("objects",
                                           make_column("name", &Object::name),
                                           make_column("name_len", &Object::nameLen, generated_always_as(length(&Object::name))),
                                           make_column("number", &Object::number)));
    storage.sync_schema();

this one does not break:

    struct Object {
        std::string name;
        int nameLen;
        int number;
    };
    constexpr int offset = 0;
    auto storage = make_storage("",
                                make_table("objects",
                                           make_column("name", &Object::name),
                                           make_column("name_len", &Object::nameLen, generated_always_as( offset + length(&Object::name))),
                                           make_column("number", &Object::number)));
    storage.sync_schema();

so?

[fnc12]

fixed in dev