Macro create_bitflags 

macro_rules! create_bitflags {
    ($(#[$meta:meta])* $vis:vis $Name:ident, $TagType:ty, [$(($FlagName:ident, $TypeName:ident),)+]) => { ... };
}

Convenience macro to work around the fact the [bitflags] crate does not yet support iterating over the individual flags. This macro essentially creates the [bitflags] and puts the individual flags into an associated constant pub const ALL_FLAGS: &'static [].