}
		}
		return "UNSAFEPTR???"
	case "chan int":
		c := key.Interface().(chan int)
		for i := range chans {
			if c == chans[i] {
				return fmt.Sprintf("CHAN%d", i)
			}
		}
		return "CHAN???"
	default:
		return fmt.Sprint(key)
	}
}

var (
	ints  [3]int
	chans = makeChans()
	pin   runtime.Pinner
)

func makeChans() []chan int {

func NewChan(dir ChanDir, elem Type) *Chan {
	return &Chan{dir: dir, elem: elem}
}

// Dir returns the direction of channel c.
func (c *Chan) Dir() ChanDir { return c.dir }

// Elem returns the element type of channel c.
func (c *Chan) Elem() Type { return c.elem }

func (c *Chan) Underlying() Type { return c }

		return U
	}
	ch, ok := U.(*types.Chan)
	if !ok {
		return nil // no core type as identical < len(terms) and U is not a channel.
	}
	// https://go.dev/ref/spec#Core_types
	// "the type chan E if T contains only bidirectional channels, or the type chan<- E or
	// <-chan E depending on the direction of the directional channels present."
	for chans := identical; chans < len(terms); chans++ {

		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

        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)

    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);
    }

func _() {
	type namedA chan int
	type namedB chan<- int

	var a chan int
	var A namedA
	var b chan<- int
	var B namedB

	// Defined types win over channel types irrespective of channel direction.
	f(A, b /* ERROR "cannot use b (variable of type chan<- int) as namedA value in argument to f" */)
	f(b /* ERROR "cannot use b (variable of type chan<- int) as namedA value in argument to f" */, A)

package builtins

// close

type C0 interface{ int }
type C1 interface{ chan int }
type C2 interface{ chan int | <-chan int }
type C3 interface{ chan int | chan float32 }
type C4 interface{ chan int | chan<- int }
type C5[T any] interface{ ~chan T | chan<- T }

func f1[T C1](ch T) {
	close(ch)
}

func f2[T C3](ch T) {
	close(ch)
}

func f3[T C4](ch T) {

	dup("x.(interface{})"),
	dup("x.(interface{m(); n(x int); E})"),
	dup("x.(interface{m(); n(x int) T; E; F})"),

	dup("x.(map[K]V)"),

	dup("x.(chan E)"),
	dup("x.(<-chan E)"),
	dup("x.(chan<- chan int)"),
	dup("x.(chan<- <-chan int)"),
	dup("x.(<-chan chan int)"),
	dup("x.(chan (<-chan int))"),

	dup("f()"),
	dup("f(x)"),
	dup("int(x)"),
	dup("f(x, x + y)"),
	dup("f(s...)"),
	dup("f(a, s...)"),

// ResultChan implements Interface
func (w emptyWatch) ResultChan() <-chan Event {
	return chan Event(w)
}

// FakeWatcher lets you test anything that consumes a watch.Interface; threadsafe.
type FakeWatcher struct {
	result  chan Event
	stopped bool
	sync.Mutex
}

func NewFake() *FakeWatcher {
	return &FakeWatcher{
		result: make(chan Event),
	}
}