Macro easy_terminated 

macro_rules! easy_terminated {
    (
        @($punct:ty)
        $(#[$meta:meta])*
        $vis:vis struct $name:ident {
            $($(#[$fmeta:meta])* $fvis:vis $fname:ident : $ftype:ty),*
            $(,)?
        }
    ) => { ... };
}

Defines structure and implements Parse for it.

Fields will be parsed in any order separated by specified punctuation. Parsing continues until the end of this parse stream.