return
			}
			done <- true
		}()
		close(c2)
		select {
		case <-c1:
		default:
		}
		if !<-done {
			t.Fatal("no chan is ready")
		}
	}
}

func TestSelfSelect(t *testing.T) {
	// Ensure that send/recv on the same chan in select
	// does not crash nor deadlock.
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
	for _, chanCap := range []int{0, 10} {
		var wg sync.WaitGroup