*     method
   * @throws IOException if {@code swallowIOException} is false and {@link Flushable#flush} throws
   *     an {@code IOException}.
   * @see Closeables#close
   */
  public static void flush(Flushable flushable, boolean swallowIOException) throws IOException {
    try {
      flushable.flush();
    } catch (IOException e) {
      if (swallowIOException) {

	} else {
		err = w.w.WriteByte('\n')
	}
	return err
}

// Flush writes any buffered data to the underlying [io.Writer].
// To check if an error occurred during Flush, call [Writer.Error].
func (w *Writer) Flush() {
	w.w.Flush()
}

// Error reports any error that has occurred during
// a previous [Writer.Write] or [Writer.Flush].
func (w *Writer) Error() error {
	_, err := w.w.Write(nil)
	return err
}

						t.Errorf("i=%d, firstN=%d, flush=%t: Write: %v", i, firstN, flush, err)
						continue outer
					}
					if !flush {
						continue
					}
					if err := w.Flush(); err != nil {
						t.Errorf("i=%d, firstN=%d, flush=%t: Flush: %v", i, firstN, flush, err)
						continue outer
					}
				}
				if err := w.Close(); err != nil {
					t.Errorf("i=%d, firstN=%d, flush=%t: Close: %v", i, firstN, flush, err)

    {
        printf("cannot add vectored exception handler\n");
        fflush(stdout);
        return 2;
    }
    void *continueHandlerHandle = AddVectoredContinueHandler(0, customContinueHandlder);
    if (NULL == continueHandlerHandle)
    {
        printf("cannot add vectored continue handler\n");
        fflush(stdout);
        return 2;
    }

	fmt.Fprintln(w)
	w.Flush()

	// Format right-aligned in space-separated columns of minimal width 5
	// and at least one blank of padding (so wider column entries do not
	// touch each other).
	w.Init(os.Stdout, 5, 0, 1, ' ', tabwriter.AlignRight)
	fmt.Fprintln(w, "a\tb\tc\td\t.")
	fmt.Fprintln(w, "123\t12345\t1234567\t123456789\t.")
	fmt.Fprintln(w)
	w.Flush()

	// output:
	// a	b	c	d		.

        renderer.onOutput(start(id: 3, parentId: null, status: ":bar"))
        renderer.onOutput(updateNow())
        console.flush()

        then:
        progressArea.display == ["> :foo"]

        and:
        renderer.onOutput(complete(2))
        renderer.onOutput(updateNow())
        console.flush()

        then:
        progressArea.display == ["> :bar"]
    }

        10_000 * listener.onOutput(_)
    }

    def "background flush does nothing when events already flushed"() {
        def event1 = event('1')
        def event2 = event('2')
        def flush = new FlushOutputEvent()

        given:
        renderer.onOutput(event1)
        renderer.onOutput(event2)
        renderer.onOutput(flush)

        when:
        executor.runFixedScheduledActionsNow()

    super.write(c);
    flush(); // flush write to TestOutputStream to get its behavior
  }

  @Override
  public void write(char[] cbuf, int off, int len) throws IOException {
    super.write(cbuf, off, len);
    flush();
  }

  @Override
  public void write(String str, int off, int len) throws IOException {
    super.write(str, off, len);
    flush();
  }

  public boolean closed() {

  public Writer openStream() throws IOException {
    // using TestByteSink's output stream to get option behavior, so flush to it on every write
    return new FilterWriter(new OutputStreamWriter(byteSink.openStream(), UTF_8)) {
      @Override
      public void write(int c) throws IOException {
        super.write(c);
        flush();
      }

      @Override
      public void write(char[] cbuf, int off, int len) throws IOException {

		w.Write([]byte("one"))
		if err := ctl.Flush(); err != nil {
			t.Errorf("before setting deadline: ctl.Flush() = %v, want nil", err)
		}
		if err := ctl.SetWriteDeadline(time.Now().Add(-10 * time.Second)); err != nil {
			t.Errorf("ctl.SetWriteDeadline() = %v, want nil", err)
		}

		w.Write([]byte("two"))
		if err := ctl.Flush(); err == nil {
			t.Errorf("after setting deadline: ctl.Flush() = nil, want non-nil")
		}