if !strings.Contains(got, lostevent) {
		t.Fatalf("got:\n\t%q\ndoes not contain:\n\t%q\n", got, lostevent)
	}
}

// stackContainsLabeled takes a spec like funcname;key=value and matches if the stack has that key
// and value and has funcname somewhere in the stack.
func stackContainsLabeled(spec string, count uintptr, stk []*profile.Location, labels map[string][]string) bool {
	base, kv, ok := strings.Cut(spec, ";")
	if !ok {