use bitfields::bitfield;
#[bitfield(u64)]
pub struct Bitfield {
#[bits(4, default = 0x1)]
a: u8,
#[bits(60, default = 0xFFFF_FFFF_FFFF)]
_padding: u64
}
fn main() {
let bitfield = Bitfield::new();
assert_eq!(bitfield.a(), 0x1);
assert_eq!(bitfield.into_bits(), 0xF_FFFF_FFFF_FFF1);
assert_eq!(bitfield._padding(), 0x1);
}