Macro enum_derive_2018::EnumInnerAsTrait

macro_rules! EnumInnerAsTrait {
    (
        @expand ($vis:vis $fn_name:ident -> &mut $tr:ty), $($tail:tt)*
    ) => { ... };
    (
        @expand ($vis:vis $fn_name:ident -> &$tr:ty), $($tail:tt)*
    ) => { ... };
    (
        @expand_inner
        ($vis:vis), $fn_name:ident, (mut), $tr:ty,
        $ty_name:ident,
        ($($var_names:ident($_var_tys:ty),)*)
    ) => { ... };
    (
        @expand_inner
        ($vis:vis), $fn_name:ident, (), $tr:ty,
        $ty_name:ident,
        ($($var_names:ident($_var_tys:ty),)*)
    ) => { ... };
    ($arg:tt $vis:vis enum $name:ident { $($body:tt)* }) => { ... };
}