I am trying the following usage:

#[derive(Merge)]
pub struct Test<T> {
    text: Option<T>,
}

My compiler complains about missing generics for struct `Test`

I wonder if what I am trying to do is an intended use case.

Thanks for the report!  That is definitely a valid use case.  Probably I
just did not handle type parameters in the macro rules.  I’ll have a
look at it and see whether this can be fixed easily.

/Robin