Update CHECKPOINT-COMPILER-API: Resume banner + Log entries for Step D (metatype declare/define re-expressed as sx over the compiler-API) and the empty-member-types-valid change. 709/0 corpus + 476/476 unit.
Update CHECKPOINT-COMPILER-API: Resume banner + Log entries for Step D (metatype declare/define re-expressed as sx over the compiler-API) and the empty-member-types-valid change. 709/0 corpus + 476/476 unit.