<p>the LLVM people have made meta-TableGen. horrifying <a href="https://mlir.llvm.org/docs/Dialects/IRDL/" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">mlir.llvm.org/docs/Dialects/IR</span><span class="invisible">DL/</span></a></p>