diff --git a/mlir/include/mlir/Dialect/Shape/IR/ShapeOps.td b/mlir/include/mlir/Dialect/Shape/IR/ShapeOps.td
--- a/mlir/include/mlir/Dialect/Shape/IR/ShapeOps.td
+++ b/mlir/include/mlir/Dialect/Shape/IR/ShapeOps.td
@@ -748,6 +748,12 @@
   let arguments = (ins Variadic<Shape_WitnessType>:$inputs);
   let results = (outs Shape_WitnessType:$result);
 
+  // Only needed while tablegen is unable to generate this for ops with variadic
+  // arguments.
+  let builders = [
+    OpBuilder<(ins "ValueRange":$inputs)>,
+  ];
+
   let assemblyFormat = "$inputs attr-dict";
 
   let hasFolder = 1;
diff --git a/mlir/lib/Dialect/Shape/IR/Shape.cpp b/mlir/lib/Dialect/Shape/IR/Shape.cpp
--- a/mlir/lib/Dialect/Shape/IR/Shape.cpp
+++ b/mlir/lib/Dialect/Shape/IR/Shape.cpp
@@ -436,6 +436,11 @@
   return success();
 }
 
+void AssumingAllOp::build(OpBuilder &b, OperationState &state,
+                          ValueRange inputs) {
+  build(b, state, b.getType<WitnessType>(), inputs);
+}
+
 //===----------------------------------------------------------------------===//
 // BroadcastOp
 //===----------------------------------------------------------------------===//