Derive Macro FromBytes 

#[derive(FromBytes)]
{
    // Attributes available to this derive:
    #[bits]
    #[dyn_int]
    #[key_dyn_length]
    #[val_dyn_length]
    #[dyn_length]
    #[toggles]
    #[toggled_by]
    #[length_for]
    #[length_by]
    #[variant_for]
    #[variant_by]
    #[no_discriminator]
}