Macro shawshank::custom_intern_id

macro_rules! custom_intern_id {
    ( $name:ident, $base:ty, $min:expr, $max:expr ) => { ... };
    ( $name:ident, $base:ty ) => { ... };
}

Facilitates defining tuple structs that may be used as custom IDs.

See the section from ArenaSet for an example.