use heapsz_derive::HeapSize; #[derive(HeapSize)] pub struct Blank { pub field_bool: bool, pub field_u8: u8, pub field_u16: u16, pub field_u32: u32, pub field_u64: u64, pub field_u128: u128, pub field_usize: usize, pub field_f32: f32, pub field_f64: f64, } fn main() {}