//
	// Package time does not know about seq, but if this is a channel timer (t.isChan == true),
	// this file uses t.seq as a sequence number to recognize and squelch
	// sends that correspond to an earlier (stale) timer configuration,
	// similar to its use in netpoll. In this usage (that is, when t.isChan == true),
	// writes to seq are protected by both t.mu and t.sendLock,

	n := vmkcall(fn, nil, &init, args)
	if len(init) == 0 {
		return n
	}
	init.Append(n)
	return ir.NewBlockStmt(n.Pos(), init)
}

func chanfn(name string, n int, t *types.Type) ir.Node {
	if !t.IsChan() {
		base.Fatalf("chanfn %v", t)
	}
	switch n {
	case 1:
		return typecheck.LookupRuntime(name, t.Elem())
	case 2:
		return typecheck.LookupRuntime(name, t.Elem(), t.Elem())
	}

// tcRecv typechecks an ORECV node.
func tcRecv(n *ir.UnaryExpr) ir.Node {
	n.X = Expr(n.X)
	n.X = DefaultLit(n.X, nil)
	l := n.X
	t := l.Type()
	if t == nil {
		n.SetType(nil)
		return n
	}
	if !t.IsChan() {
		base.Errorf("invalid operation: %v (receive from non-chan type %v)", n, t)
		n.SetType(nil)
		return n
	}

	if !t.ChanDir().CanRecv() {

func tcClose(n *ir.UnaryExpr) ir.Node {
	n.X = Expr(n.X)
	n.X = DefaultLit(n.X, nil)
	l := n.X
	t := l.Type()
	if t == nil {
		n.SetType(nil)
		return n
	}
	if !t.IsChan() {
		base.Errorf("invalid operation: %v (non-chan type %v)", n, t)
		n.SetType(nil)
		return n
	}

	if !t.ChanDir().CanSend() {
		base.Errorf("invalid operation: %v (cannot close receive-only channel)", n)

// is a correctness rewrite, not an optimization.
func isChanLenCap(n ir.Node) bool {
	return (n.Op() == ir.OLEN || n.Op() == ir.OCAP) && n.(*ir.UnaryExpr).X.Type().IsChan()

		return true
	}
	return false
}

func (t *Type) IsString() bool {
	return t.kind == TSTRING
}

func (t *Type) IsMap() bool {
	return t.kind == TMAP
}

func (t *Type) IsChan() bool {
	return t.kind == TCHAN
}

func (t *Type) IsSlice() bool {
	return t.kind == TSLICE
}

func (t *Type) IsArray() bool {
	return t.kind == TARRAY
}

func (s *state) referenceTypeBuiltin(n *ir.UnaryExpr, x *ssa.Value) *ssa.Value {
	if !n.X.Type().IsMap() && !n.X.Type().IsChan() {
		s.Fatalf("node must be a map or a channel")
	}
	if n.X.Type().IsChan() && n.Op() == ir.OLEN {
		s.Fatalf("cannot inline len(chan)") // must use runtime.chanlen now
	}
	if n.X.Type().IsChan() && n.Op() == ir.OCAP {
		s.Fatalf("cannot inline cap(chan)") // must use runtime.chancap now
	}

func Less[T Ordered](x, y T) bool {
	return (isNaN(x) && !isNaN(y)) || x < y
}

// Compare returns
//
//	-1 if x is less than y,
//	 0 if x equals y,
//	+1 if x is greater than y.
//
// For floating-point types, a NaN is considered less than any non-NaN,
// a NaN is considered equal to a NaN, and -0.0 is equal to 0.0.
func Compare[T Ordered](x, y T) int {
	xNaN := isNaN(x)
	yNaN := isNaN(y)
	if xNaN {
		if yNaN {
			return 0

			t.Errorf("min(%v, %v) = %v, want %v", tt.max, tt.min, z, tt.min)
		}
	}
	for _, x := range all {
		if z := min(nan, x); !math.IsNaN(z) {
			t.Errorf("min(%v, %v) = %v, want %v", nan, x, z, nan)
		}
		if z := min(x, nan); !math.IsNaN(z) {
			t.Errorf("min(%v, %v) = %v, want %v", nan, x, z, nan)
		}
	}
}

func TestMaxFloat(t *testing.T) {
	for _, tt := range tests {

func _SliceEqual[Elem comparable](s1, s2 []Elem) bool {
	if len(s1) != len(s2) {
		return false
	}
	for i, v1 := range s1 {
		v2 := s2[i]
		if v1 != v2 {
			isNaN := func(f Elem) bool { return f != f }
			if !isNaN(v1) || !isNaN(v2) {
				return false
			}
		}
	}
	return true
}

// A Graph is a collection of nodes. A node may have an arbitrary number