functions

static union Answers {
    int answer();
    void answer();
    string answer();
}

alias Container = Answers;

enum NotVoid(alias F) = !is(ReturnType!(F) == void);

enum functions = functionsOf!(Container, "Container", NotVoid);

static assert(functions.length == 2);

static assert(
    functions[0].mixture ==
    q{@system %s.ReturnType!(__traits(getOverloads, Container, "answer")[0]) answer();}
    .format(__MODULE__));
static assert(functions[0].overloadIndex == 0);

static assert(
    functions[1].mixture ==
    q{@system %s.ReturnType!(__traits(getOverloads, Container, "answer")[2]) answer();}
    .format(__MODULE__));
static assert(functions[1].overloadIndex == 2);