Macro structural::z_impl_box_into_field_method

macro_rules! z_impl_box_into_field_method {
    ($field_name:ty) => { ... };
}

For use in manual implementations of the IntoField trait.

Implements the IntoField::box_into_field_ method, automatically handling conditional #![no_std] support in structural.

For an example of using this macro look at the documentation for IntoField