Macro throws::throws

macro_rules! throws {
    ($($(#[$attr:meta])* $name:ident = $($case:ident($error:path)),*);+) => { ... };
    ($($(#[$attr:meta])* pub $name:ident = $($case:ident($error:path)),*);+) => { ... };
    ($($(#[$attr:meta])* pub($($restriction:tt)+) $name:ident = $($case:ident($error:path)),*);+) => { ... };
    ($($(#[$attr:meta])* ($($vis:tt)*) $name:ident = $($case:ident($error:path)),*);+) => { ... };
}