Macro derive_deftly_template_QtySetters 

macro_rules! derive_deftly_template_QtySetters {
    ({ $($driver:tt)* } [$($aoptions:tt)*] ($($future:tt)*) $($tpassthrough:tt)*) => { ... };
    ($($wrong:tt)*) => { ... };
}

Define setters on the builder for every field of type Qty

The field type must be spelled precisely that way: we use approx_equal(...).

This is a derive_deftly template. Do not invoke it directly. To use it, write: #[derive(Deftly)] #[derive_deftly(QtySetters)].