Writer writer = new AppendableWriter(spy);

    writer.write("Hello");
    assertFalse(spy.flushed);
    assertFalse(spy.closed);

    writer.flush();
    assertTrue(spy.flushed);
    assertFalse(spy.closed);

    writer.close();
    assertTrue(spy.flushed);
    assertTrue(spy.closed);
  }

  public void testCloseIsFinal() throws IOException {

		s = s[:maxTraceStringLen]
	}

	lock(&t.lock)
	w := unsafeTraceWriter(gen, t.buf)

	// Ensure we have a place to write to.
	var flushed bool
	w, flushed = w.ensure(2 + 2*traceBytesPerNumber + len(s) /* traceEvStrings + traceEvString + ID + len + string data */)
	if flushed {
		// Annotate the batch as containing strings.
		w.byte(byte(traceEvStrings))
	}

	// Write out the string.
	w.byte(byte(traceEvString))

	bytesMarked uint64

	// Heap scan work performed on this gcWork. This is aggregated into
	// gcController by dispose and may also be flushed by callers.
	// Other types of scan work are flushed immediately.
	heapScanWork int64

	// flushedWork indicates that a non-empty work buffer was
	// flushed to the global work list since the last gcMarkDone
	// termination check. Specifically, this indicates that this

	// bound is pretty loose, but avoids counting
	// lots of varint sizes.
	//
	// Add 1 because we might also write a traceAllocFreeTypesBatch byte.
	var flushed bool
	w, flushed = w.ensure(1 + maxBytes)
	if flushed {
		// Annotate the batch as containing types.
		w.byte(byte(traceAllocFreeTypesBatch))
	}

	// Emit type.
	w.varint(uint64(node.id))
	w.varint(uint64(uintptr(unsafe.Pointer(typ))))

		_, err := f.Write([]byte{text[i]})
		if err != nil {
			t.Fatal(err)
		}
	}

	// The "pre" output should all have been flushed already.
	if want, got := pre, out.String(); want != got {
		t.Errorf("filter should have already flushed %q, but flushed %q", want, got)
	}

	code, err := f.Finish()
	if err != nil {
		t.Fatal(err)
	}

	// Nothing more should have been written to out.

	if err != nil {
		z.err = err
		return
	}
	z.digest.Write(p)
	return
}

// Flush flushes the Writer to its underlying io.Writer.
func (z *Writer) Flush() error {
	if !z.wroteHeader {
		z.err = z.writeHeader()
	}
	if z.err != nil {
		return z.err
	}
	z.err = z.compressor.Flush()
	return z.err
}

// Close closes the Writer, flushing any unwritten data to the underlying

	if rw.HeaderMap == nil {
		rw.HeaderMap = make(http.Header)
	}
	rw.snapHeader = rw.HeaderMap.Clone()
}

// Flush implements [http.Flusher]. To test whether Flush was
// called, see rw.Flushed.
func (rw *ResponseRecorder) Flush() {
	if !rw.wroteHeader {
		rw.WriteHeader(200)
	}
	rw.Flushed = true
}

// Result returns the response generated by the handler.
//

        throw e;
      }
    }
  }

  /**
   * Equivalent to calling {@code flush(flushable, true)}, but with no {@code IOException} in the
   * signature.
   *
   * @param flushable the {@code Flushable} object to be flushed.
   */
  @Beta
  public static void flushQuietly(Flushable flushable) {
    try {
      flush(flushable, true);
    } catch (IOException e) {

        throw e;
      }
    }
  }

  /**
   * Equivalent to calling {@code flush(flushable, true)}, but with no {@code IOException} in the
   * signature.
   *
   * @param flushable the {@code Flushable} object to be flushed.
   */
  @Beta
  public static void flushQuietly(Flushable flushable) {
    try {
      flush(flushable, true);
    } catch (IOException e) {

func traceSnapshotMemory(gen uintptr) {
	assertWorldStopped()

	// Write a batch containing information that'll be necessary to
	// interpret the events.
	var flushed bool
	w := unsafeTraceExpWriter(gen, nil, traceExperimentAllocFree)
	w, flushed = w.ensure(1 + 4*traceBytesPerNumber)
	if flushed {
		// Annotate the batch as containing additional info.
		w.byte(byte(traceAllocFreeInfoBatch))
	}

	// Emit info.