var zerok K
		var zerov V
		return zerok, zerov, false
	}
	return keyval.key, keyval.val, true
}

// chans

func chans_Ranger[T any]() (*chans_Sender[T], *chans_Receiver[T])

// A sender is used to send values to a Receiver.
type chans_Sender[T any] struct {
	values chan<- T
	done   <-chan bool
}

func (s *chans_Sender[T]) Send(v T) bool {
	select {
	case s.values <- v:
		return true

		var zerov V
		return zerok, zerov, false
	}
	return keyval.key, keyval.val, true
}

// chans

func chans_Ranger[T any]() (*chans_Sender[T], *chans_Receiver[T]) { panic(0) }

// A sender is used to send values to a Receiver.
type chans_Sender[T any] struct {
	values chan<- T
	done <-chan bool
}

func (s *chans_Sender[T]) Send(v T) bool {
	select {
	case s.values <- v:
		return true

	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(10))
	var c [4]chan int
	c[0] = make(chan int)
	c[1] = make(chan int)
	c[2] = make(chan int, 2)
	c[3] = make(chan int, 3)
	N := int(1e5)
	if testing.Short() {
		N /= 10
	}
	// There are 4 goroutines that send N values on each of the chans,
	// + 4 goroutines that receive N values on each of the chans,

        def char1 = left as char
        def char2 = right as char
        def caseInsensitiveResult = left.toUpperCase() == right.toUpperCase() ? 0 : result

        expect:
        compareCharsIgnoringCase(char1, char2) == caseInsensitiveResult
        compareCharsIgnoringCase(char2, char1) == -caseInsensitiveResult
        compareChars(char1, char2) == Character.compare(char1, char2)
        compareChars(char2, char1) == Character.compare(char2, char1)

var c9 <- chan chan <- chan int = (<-chan (chan<- (chan int)))(nil)
var c10 chan <- <- chan chan int = (chan<- (<-chan (chan int)))(nil)
var c11 chan <- chan <- chan int = (chan<- (chan<- (chan int)))(nil)
var c12 chan chan <- <- chan int = (chan (chan<- (<-chan int)))(nil)
var c13 chan chan <- chan <- int = (chan (chan<- (chan<- int)))(nil)

var r1 chan<- (chan int) = (chan <- chan int)(nil)

	p.C12 = (chan (chan<- (<-chan int)))(nil)
	p.C13 = (chan (chan<- (chan<- int)))(nil)

	p.R1 = (chan <- chan int)(nil)
	p.R3 = (<- chan chan int)(nil)
	p.R4 = (chan chan <- int)(nil)

	p.R5 = (<- chan <- chan int)(nil)
	p.R6 = (chan <- <- chan int)(nil)
	p.R7 = (chan <- chan <- int)(nil)

	p.R8 = (<- chan <- chan chan int)(nil)
	p.R9 = (<- chan chan <- chan int)(nil)
	p.R10 = (chan <- <- chan chan int)(nil)

    static int compareCharsIgnoringCase(char char1, char char2) {
        if (char1 == char2) {
            return 0;
        }
        return isFileSeparator(char1)
            ? isFileSeparator(char2)
                ? 0
                : -1
            : isFileSeparator(char2)
                ? 1
                : compareDifferentCharsIgnoringCase(char1, char2);
    }

var C9 <- chan chan <- chan int = (<-chan (chan<- (chan int)))(nil)
var C10 chan <- <- chan chan int = (chan<- (<-chan (chan int)))(nil)
var C11 chan <- chan <- chan int = (chan<- (chan<- (chan int)))(nil)
var C12 chan chan <- <- chan int = (chan (chan<- (<-chan int)))(nil)
var C13 chan chan <- chan <- int = (chan (chan<- (chan<- int)))(nil)

var R1 chan<- (chan int) = (chan <- chan int)(nil)

	go func() {
		close(c)
		compl <- true
	}()
	c = make(chan int)
	<-compl
}

func TestRaceChanItselfLen(t *testing.T) {
	compl := make(chan bool, 1)
	c := make(chan int)
	go func() {
		_ = len(c)
		compl <- true
	}()
	c = make(chan int)
	<-compl
}

func TestRaceChanItselfCap(t *testing.T) {
	compl := make(chan bool, 1)
	c := make(chan int)
	go func() {
		_ = cap(c)

	<-chan (<-chan (<-chan (<-chan (<-chan int))))(nil)

	<-(<-chan int)(nil)
	<-(<-chan chan int)(nil)
	<-(<-chan chan chan int)(nil)
	<-(<-chan chan chan chan int)(nil)
	<-(<-chan chan chan chan chan int)(nil)

	<-(<-chan<-chan int)(nil)
	<-(<-chan<-chan<-chan int)(nil)
	<-(<-chan<-chan<-chan<-chan int)(nil)
	<-(<-chan<-chan<-chan<-chan<-chan int)(nil)

	<-(<-chan (<-chan int))(nil)
	<-(<-chan (<-chan (<-chan int)))(nil)