auto it = block.rbegin();
  YieldOp yield = dyn_cast<YieldOp>(*it++);

  if (it == block.rend()) return std::nullopt;

  // Operation which is expected to consume all the call results.
  Operation* call_consumer = yield;

  // Allow a single ToBoolOp between the call and the yield (valid only
  // when the yield has a single operand)
  if (allow_to_bool && yield.getNumOperands() == 1 && isa<ToBoolOp>(*it)) {

  func.return
}

// -----

// Check that a tf_executor.yield parent is a tf_executor.island.
func.func @parent_is_island() {
  "tf.some_op"() ({
    tf_executor.yield
// expected-error@-1 {{'tf_executor.yield' op expects parent op 'tf_executor.island'}}
  }) : () -> ()
  func.return
}

// -----

// Check that an island yield matches the island results.

  OpBuilder builder(&island.GetBody(), island.GetBody().begin());
  tf_executor::YieldOp yield = island.GetYield();
  if (yield.getNumOperands() == 0) {
    builder.create<TF::NoOp>(island.getLoc(), TypeRange{}, ValueRange{});
  } else if (yield.getNumOperands() == 1) {
    Value operand = yield.getOperand(0);
    auto identity = builder.create<TF::IdentityOp>(island.getLoc(),

    %1 = "tf.WhileRegion"(%0) ({
       // Condition region
       // CHECK: ^bb
       // CHECK: "tf.Yield"
       ^bb0(%carg0: tensor<i32>):
          %c0 = "tf.Const"() {value = dense<0> : tensor<i32>} : () -> tensor<i32>
          %c1 = "tf.GreaterEqual"(%carg0, %0) {T = i32, device = ""} : (tensor<i32>, tensor<i32>) -> tensor<i1>
          "tf.Yield"(%c1) : (tensor<i1>) -> ()
      }, {
       // Body region
       // CHECK: ^bb0

            "tf.Yield"(%u0, %id0, %id0) : (!tf_res, !tf_res, !tf_res) -> ()
          }, {
            // expected-remark@below {{Result #0, ID 3 : 0, 1, 3, 4, 5}}
            %id0 = "tf.Identity"(%vh0) : (!tf_res) -> !tf_res
            "tf.Yield"(%id0, %id0, %arg0) : (!tf_res, !tf_res, !tf_res) -> ()
          }, {
            "tf.Yield"(%vh0, %arg1, %arg1) : (!tf_res, !tf_res, !tf_res) -> ()

}

mlir::LogicalResult IslandOp::verify() {
  IslandOp island = *this;
  if (!island.GetBody().args_empty())
    return island.emitOpError() << "expects body without any arguments";

  Operation &yield = island.GetBody().back();
  if (!isa<YieldOp>(yield))
    return yield.emitOpError()
           << "invalid tf_executor.island terminator, yield expected";

	informerFactory.Start(ctx.Done())
	if !cache.WaitForCacheSync(ctx.Done(), ctbInformer.Informer().HasSynced) {
		t.Fatalf("Timed out waiting for informer to sync")
	}

	t.Run("foo should yield the first certificate", func(t *testing.T) {
		gotBundle, err := ctbManager.GetTrustAnchorsByName("foo", false)
		if err != nil {
			t.Fatalf("Got error while calling GetTrustAnchorsBySigner: %v", err)
		}

                    yield webConfigService.getWebConfig(id).get();
                }
                case FILE -> {
                    final FileConfigService fileConfigService = ComponentUtil.getComponent(FileConfigService.class);
                    yield fileConfigService.getFileConfig(id).get();
                }
                case DATA -> {

    %1 = tf_executor.island {
      tf_executor.yield
    }
    %2 = tf_executor.island {
      tf_executor.yield
    }
    %3:2 = tf_executor.island(%1, %2) {
      tf_executor.yield %arg0 : tensor<*xf32>
    }
    tf_executor.fetch %3#0 : tensor<*xf32>
  }
// CHECK:      %[[ISLAND0:[a-z_0-9]*]] = tf_executor.island {
// CHECK-NEXT:   tf_executor.yield
// CHECK:      %[[ISLAND1:[a-z_0-9]*]] = tf_executor.island {

    pass


async def asyncgen_state(state: Dict[str, str] = Depends(get_state)):
    state["/async"] = "asyncgen started"
    yield state["/async"]
    state["/async"] = "asyncgen completed"


def generator_state(state: Dict[str, str] = Depends(get_state)):
    state["/sync"] = "generator started"
    yield state["/sync"]
    state["/sync"] = "generator completed"