1 #[cfg(feature = "use_core")] 2 extern crate core; 3 4 #[macro_use] 5 extern crate derivative; 6 7 #[derive(Copy, Clone, Derivative)] 8 #[derivative(Debug)] 9 #[repr(C, packed)] 10 struct Test { 11 a: u8, 12 b: u32, 13 }