func BenchmarkLBusy(b *testing.B) {
r := singletasking.LRunner{}
r.Run(blocker)
for i := 0; i < b.N; i++ {
r.Run(blocker)
}
}
func BenchmarkLUnblocked(b *testing.B) {
r := singletasking.LRunner{}
for i := 0; i < b.N; i++ {
r.Run(void)
}
}