Macro attributes 

macro_rules! attributes {
    (
        $requested:expr,
        Mutable {$($mut_a:ident: $mut_v:expr),* $(,)?},
        Immutable {$($immut_a:ident: $immut_v:expr),* $(,)?}
    ) => { ... };
}

Helper for building [fio::NodeAttributes2]givenrequestedattributes. Code will only run forrequested` attributes.

Example:

attributes!( requested, Mutable { creation_time: 123, modification_time: 456 }, Immutable { content_size: 789 } );