if (!ret) continue;

      LLVM_DEBUG(ret.print(llvm::dbgs() << "\ncomputed result = "));

      // If worklist is empty, then this is the root query op.
      if (worklist.empty()) {
        LLVM_DEBUG(llvm::dbgs() << "[root node]\n");
        if (auto dea = mlir::dyn_cast<DenseIntElementsAttr>(ret)) {
          if (dea.getNumElements() != 1) {
            LLVM_DEBUG(llvm::dbgs() << "Unexpected number of elements\n");