Re: Linking error when changing > to >>

I don't know if this is related, or if I am doing something stupid again, but
I noticed that when I am changing the grammar 

auto const var_dec_def = x3::lexeme["var "]
                         > +x3::alnum
                         > ":"
                         > type
                         > ";";

to

auto const var_dec_def = x3::lexeme["var "]
                         > +x3::alnum
                         > ":"
                         > -type //type is now optional
                         > ";";

and dont change something in the ast, it compiles fine, but when I change

struct VariableDec {
    std::string _name;
    Type _type;
};

to 

struct VariableDec {
    std::string _name;
    boost::optional<Type> _type;
};

now, I am also getting linking errors.
Again, I dont know if I am doing something stupid here, I am just trying to
help, please tell me immediately if I am makeing something stupid with
spirit x3, so I can avoid these mistakes in the future.

Greetings Exagon



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