for i, b := range f.Blocks {
		idToIdx[b.ID] = i
	}

	// Set of blocks we're moving, by ID.
	move := map[ID]struct{}{}

	// Map from block ID to the moving blocks that should
	// come right after it.
	after := map[ID][]*Block{}

	// Check each loop header and decide if we want to move it.
	for _, loop := range loopnest.loops {
		b := loop.header
		var p *Block // b's in-loop predecessor

	// system. But also fallback in case of any error with MPTCP.
	//
	// Possible MPTCP specific error: ENOPROTOOPT (sysctl net.mptcp.enabled=0)
	// But just in case MPTCP is blocked differently (SELinux, etc.), just
	// retry with "plain" TCP.
	return sd.dialTCP(ctx, laddr, raddr)
}

func (sl *sysListener) listenMPTCP(ctx context.Context, laddr *TCPAddr) (*TCPListener, error) {

				d.progCoeffs[compIndex] = make([]block, mxx*myy*d.comp[compIndex].h*d.comp[compIndex].v)
			}
		}
	}

	d.bits = bits{}
	mcu, expectedRST := 0, uint8(rst0Marker)
	var (
		// b is the decoded coefficients, in natural (not zig-zag) order.
		b  block
		dc [maxComponents]int32
		// bx and by are the location of the current block, in units of 8x8
		// blocks: the third block in the first row has (bx, by) = (2, 0).

		return syscall.Environ(), nil
	}
	var blockp *uint16
	err = windows.CreateEnvironmentBlock(&blockp, sys.Token, false)
	if err != nil {
		return nil, err
	}
	defer windows.DestroyEnvironmentBlock(blockp)

	const size = unsafe.Sizeof(*blockp)
	for *blockp != 0 { // environment block ends with empty string
		// find NUL terminator
		end := unsafe.Add(unsafe.Pointer(blockp), size)
		for *(*uint16)(end) != 0 {

		// is safe.
		if ii.combinesBackward() {
			cccB := b[k-1].ccc
			cccC := ii.ccc
			blocked := false // b[i] blocked by starter or greater or equal CCC?
			if cccB == 0 {
				s = k - 1
			} else {
				blocked = s != k-1 && cccB >= cccC
			}
			if !blocked {
				combined := combine(rb.runeAt(s), rb.runeAt(i))
				if combined != 0 {
					rb.assignRune(s, combined)
					continue

	traceEvGoBlock             // goroutine blocks [timestamp, reason, stack ID]
	traceEvGoUnblock           // goroutine is unblocked [timestamp, goroutine ID, goroutine seq, stack ID]
	traceEvGoSyscallBegin      // syscall enter [timestamp, P seq, stack ID]
	traceEvGoSyscallEnd        // syscall exit [timestamp]
	traceEvGoSyscallEndBlocked // syscall exit and it blocked at some point [timestamp]

	item   *itemBuilder
	todo   func() line
}

func (b *listBuilder) build(p buildState) Block {
	blocks := p.blocks()
	pos := p.pos()

	// list can have wrong pos b/c extend dance.
	pos.EndLine = blocks[len(blocks)-1].Pos().EndLine
Loose:
	for i, c := range blocks {
		c := c.(*Item)
		if i+1 < len(blocks) {
			if blocks[i+1].Pos().StartLine-c.EndLine > 1 {
				b.loose = true
				break Loose
			}
		}

 */
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.METHOD})
public @interface ToBeReplacedByLazyProperty {

    /**
     * Additional comment, e.g. why upgrade of a property is blocked.
     */
    String comment() default "";

    /**
     * Link to a GitHub issue if it exists.
     */
    String issue() default "";

		t.Errorf("<-parent.Done() == %v want nothing (it should block)", x)
	case x := <-cancelChild.Done():
		t.Errorf("<-cancelChild.Done() == %v want nothing (it should block)", x)
	case x := <-timerChild.Done():
		t.Errorf("<-timerChild.Done() == %v want nothing (it should block)", x)
	case x := <-valueChild.Done():
		t.Errorf("<-valueChild.Done() == %v want nothing (it should block)", x)
	default:
	}

			t.CloseIdleConnections()
		}
	}

	s.wg.Wait()
}

func (s *Server) logCloseHangDebugInfo() {
	s.mu.Lock()
	defer s.mu.Unlock()
	var buf strings.Builder
	buf.WriteString("httptest.Server blocked in Close after 5 seconds, waiting for connections:\n")
	for c, st := range s.conns {
		fmt.Fprintf(&buf, "  %T %p %v in state %v\n", c, c, c.RemoteAddr(), st)
	}
	log.Print(buf.String())
}