// Must be called with a P.
//
// wakep should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - gvisor.dev/gvisor
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname wakep
func wakep() {
	// Be conservative about spinning threads, only start one if none exist

	orig, extra []int
}{
	{nil, nil},
	{[]int{}, nil},
	{nil, []int{}},
	{[]int{}, []int{}},
	{nil, []int{22}},
	{[]int{}, []int{22}},
	{make([]int, 2, 4), nil},
	{make([]int, 2, 4), []int{}},
	{make([]int, 2, 4), []int{22}},
	{make([]int, 2, 4), []int{22, 33, 44}},
}

func TestAppend(t *testing.T) {
	for i, test := range appendTests {
		origLen, extraLen := len(test.orig), len(test.extra)

	// and each iteration makes its own copy of the value c.
	var runcases []runtimeSelect
	if len(cases) > 4 {
		// Slice is heap allocated due to runtime dependent capacity.
		runcases = make([]runtimeSelect, len(cases))
	} else {
		// Slice can be stack allocated due to constant capacity.
		runcases = make([]runtimeSelect, len(cases), 4)
	}

	haveDefault := false