Macro sel4_common::plus_define_bitfield

macro_rules! plus_define_bitfield {
    ($name:ident, $total_words:expr, $type_index:expr, $type_offset:expr, $type_bits:expr =>
        { $($variant:ident, $type_value:expr => { $($field:ident, $get_field:ident, $set_field:ident, $index:expr, $offset:expr, $bits:expr, $shift:expr, $sign_ext: expr),* }),* }) => { ... };
}