Macro impl_has_hr_timer

macro_rules! impl_has_hr_timer {
    (
        impl$({$($generics:tt)*})?
            HasHrTimer<$timer_type:ty>
            for $self:ty
        {
            mode : $mode:ty,
            field : self.$field:ident $(,)?
        }
        $($rest:tt)*
    ) => { ... };
}

Use to implement the HasHrTimer<T> trait.

See module documentation for an example.