}

func F() {
	var (
		cr <-chan int
		cs chan<- int
		c  chan int

		ccr chan (<-chan int)
		ccs chan chan<- int
		cc  chan chan int

		ok bool
	)
	// Send cases.
	select {
	case ccr <- cr:
	case ccr <- c:
	}
	select {
	case ccs <- cs:
	case ccs <- c:
	}
	select {
	case ccr <- c:
	default:
	}
	// Receive cases.
	select {
	case cr = <-cc:
	case cs = <-cc:

func (c *sigctxt) ctr() uint64  { return c.regs().ctr }
func (c *sigctxt) link() uint64 { return c.regs().link }
func (c *sigctxt) xer() uint64  { return c.regs().xer }
func (c *sigctxt) ccr() uint64  { return c.regs().ccr }

func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
func (c *sigctxt) fault() uintptr  { return uintptr(c.regs().dar) }

	print("r31  ", hex(c.r31()), "\n")
	print("pc   ", hex(c.pc()), "\t")
	print("ctr  ", hex(c.ctr()), "\n")
	print("link ", hex(c.link()), "\t")
	print("xer  ", hex(c.xer()), "\n")
	print("ccr  ", hex(c.ccr()), "\t")
	print("trap ", hex(c.trap()), "\n")
}

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) sigpc() uintptr    { return uintptr(c.pc()) }
func (c *sigctxt) setsigpc(x uint64) { c.set_pc(x) }

				uint8(rnd.Intn(256)),
				255,
			}
			imgRGBA.SetRGBA(x, y, col)
			yo := imgYCbCr.YOffset(x, y)
			co := imgYCbCr.COffset(x, y)
			cy, ccr, ccb := color.RGBToYCbCr(col.R, col.G, col.B)
			imgYCbCr.Y[yo] = cy
			imgYCbCr.Cb[co] = ccr
			imgYCbCr.Cr[co] = ccb
		}
	}

	// Now check that both images are identical after an encode.
	var bufRGBA, bufYCbCr bytes.Buffer

	_SA_RESTORER = 0
)

type ptregs struct {
	gpr       [32]uint64
	nip       uint64
	msr       uint64
	orig_gpr3 uint64
	ctr       uint64
	link      uint64
	xer       uint64
	ccr       uint64
	softe     uint64
	trap      uint64
	dar       uint64
	dsisr     uint64
	result    uint64
}

type vreg struct {
	u [4]uint32
}

type stackt struct {
	ss_sp     *byte

        if ( nameLen == 0 ) {
            nameLen++;
        }

        size += size8(nameLen);
        if ( this.createContexts != null ) {
            for ( CreateContextRequest ccr : this.createContexts ) {
                size += size8(ccr.size());
            }
        }
        return size8(size);
    }


    /**
     * {@inheritDoc}
     *

	_SA_RESTORER = 0
)

type ptregs struct {
	gpr       [32]uint64
	nip       uint64
	msr       uint64
	orig_gpr3 uint64
	ctr       uint64
	link      uint64
	xer       uint64
	ccr       uint64
	softe     uint64
	trap      uint64
	dar       uint64
	dsisr     uint64
	result    uint64
}

type vreg struct {
	u [4]uint32
}

type stackt struct {
	ss_sp     *byte

func (c *sigctxt) ctr() uint64    { return c.regs().ctr }
func (c *sigctxt) link() uint64   { return c.regs().lr }
func (c *sigctxt) xer() uint32    { return c.regs().xer }
func (c *sigctxt) ccr() uint32    { return c.regs().cr }
func (c *sigctxt) fpscr() uint32  { return c.regs().fpscr }
func (c *sigctxt) fpscrx() uint32 { return c.regs().fpscrx }

// TODO(aix): find trap equivalent

func (c *sigctxt) ctr() uint64  { return c.regs().sc_ctr }
func (c *sigctxt) link() uint64 { return c.regs().sc_lr }
func (c *sigctxt) xer() uint64  { return c.regs().sc_xer }
func (c *sigctxt) ccr() uint64  { return c.regs().sc_cr }

func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 {
	return *(*uint64)(add(unsafe.Pointer(c.info), 16))
}

const SizeofInotifyEvent = 0x10

type PtraceRegs struct {
	Gpr       [32]uint64
	Nip       uint64
	Msr       uint64
	Orig_gpr3 uint64
	Ctr       uint64
	Link      uint64
	Xer       uint64
	Ccr       uint64
	Softe     uint64
	Trap      uint64
	Dar       uint64
	Dsisr     uint64
	Result    uint64
}

type FdSet struct {
	Bits [16]int64
}

type Sysinfo_t struct {