Macro angle_measurement_unit 

macro_rules! angle_measurement_unit {
    {
        name: $name:ident,
        suffix: $suffix:expr,
        cycle_fraction: $cycle_fraction:expr,
    } => { ... };
    {
        name: $name:ident,
        suffix: $suffix:expr,
        offset: $offset:expr,
        cycle_fraction: $cycle_fraction:expr,
    } => { ... };
}