)

type response struct {
}

type myError struct {
}

func (myError) Error() string { return "" }

func doRequest(useSelect bool) (*response, error) {
	type async struct {
		resp *response
		err  error
	}
	ch := make(chan *async, 0)
	done := make(chan struct{}, 0)

	if useSelect {
		go func() {
			select {
			case ch <- &async{resp: nil, err: myError{}}:
			case <-done:
			}
		}()
	} else {

//
// An error type might provide an Is method so it can be treated as equivalent
// to an existing error. For example, if MyError defines
//
//	func (m MyError) Is(target error) bool { return target == fs.ErrExist }
//
// then Is(MyError{}, fs.ErrExist) returns true. See [syscall.Errno.Is] for
// an example in the standard library. An Is method should only shallowly

    ListenableFuture<Object> input = UncheckedThrowingFuture.throwingError(new MyError());

    // We'd catch only MyError.class here, but then the test won't compile under GWT.
    ListenableFuture<Object> output =
        catching(input, Throwable.class, identity(), directExecutor());
    assertThat(getDone(output)).isInstanceOf(MyError.class);
  }

  public void testCatching_listenerThrowsError() throws Exception {

    ListenableFuture<Object> input = UncheckedThrowingFuture.throwingError(new MyError());

    // We'd catch only MyError.class here, but then the test won't compile under GWT.
    ListenableFuture<Object> output =
        catching(input, Throwable.class, identity(), directExecutor());
    assertThat(getDone(output)).isInstanceOf(MyError.class);
  }

  public void testCatching_listenerThrowsError() throws Exception {

	v := make([]int, len(b))
	for i, x := range b {
		v[i] = x + a
	}
	return v
}

var myError = errors.New("my error")

// MyError returns a value and an error according to its argument.
func (t *T) MyError(error bool) (bool, error) {
	if error {
		return true, myError
	}
	return false, nil
}

// A few methods to test chaining.
func (t *T) GetU() *U {
	return t.U
}

	v := make([]int, len(b))
	for i, x := range b {
		v[i] = x + a
	}
	return v
}

var myError = errors.New("my error")

// MyError returns a value and an error according to its argument.
func (t *T) MyError(error bool) (bool, error) {
	if error {
		return true, myError
	}
	return false, nil
}

// A few methods to test chaining.
func (t *T) GetU() *U {
	return t.U
}

// Calling cancel with nil sets the cause to Canceled.
//
// Example use:
//
//	ctx, cancel := context.WithCancelCause(parent)
//	cancel(myError)
//	ctx.Err() // returns context.Canceled
//	context.Cause(ctx) // returns myError
func WithCancelCause(parent Context) (ctx Context, cancel CancelCauseFunc) {
	c := withCancel(parent)
	return c, func(cause error) { c.cancel(true, Canceled, cause) }
}

	// then we inline the value expressions into the return argument
	// and then call StaticAssign to handle that copy.
	//
	// This handles simple cases like
	//
	//	var myError = errors.New("mine")
	//
	// where errors.New is
	//
	//	func New(text string) error {
	//		return &errorString{text}
	//	}
	//
	// We could make things more sophisticated but this kind of initializer