Function enum_components 

pub fn enum_components(
    types: &dyn TypeDatabase,
    type_id: TypeId,
) -> Option<(DefId, TypeId)>

Extract the enum components (DefId and member type) if this is an Enum type.

Returns Some((def_id, member_type)) where:

• def_id is the unique identity of the enum for nominal checking
• member_type is the structural union of member types (e.g., 0 | 1)