I wonder if that could have been achieved without an actual DSL. TableGen ultimately produces definitions for record types and a list of fully expanded records

I wonder if that could have been achieved without an actual DSL. TableGen ultimately produces definitions for record types and a list of fully expanded records in those types, but those "types" don't have to be actual types during the generation phase---you can instead have a generic associative array that gets validated when every record has been generated. A distinction between `class` and `multiclass` can be removed by using an ordinary function that can generate one or more records. So I feel that everything can be done without the DSL, except for a bit nicer syntax.