if err := DB.AutoMigrate(&LevelC1{}, &LevelC2{}, &LevelC3{}); err != nil {
		t.Error(err)
	}

	level2 := LevelC2{
		Value: "c2",
		LevelC1: LevelC1{
			Value: "c1",
		},
	}
	DB.Create(&level2)

	want := []LevelC3{
		{
			Value:   "c3-1",
			LevelC2: level2,
		}, {
			Value:   "c3-2",
			LevelC2: level2,
		},
	}

a select with only <code>nil</code> channels and no default case blocks forever.
</p>

<pre>
var a []int
var c, c1, c2, c3, c4 chan int
var i1, i2 int
select {
case i1 = &lt;-c1:
	print("received ", i1, " from c1\n")
case c2 &lt;- i2:
	print("sent ", i2, " to c2\n")
case i3, ok := (&lt;-c3):  // same as: i3, ok := &lt;-c3
	if ok {

a select with only <code>nil</code> channels and no default case blocks forever.
</p>

<pre>
var a []int
var c, c1, c2, c3, c4 chan int
var i1, i2 int
select {
case i1 = &lt;-c1:
	print("received ", i1, " from c1\n")
case c2 &lt;- i2:
	print("sent ", i2, " to c2\n")
case i3, ok := (&lt;-c3):  // same as: i3, ok := &lt;-c3
	if ok {

-Key":"IAAfAKJLKayLbS7SERur/QNa/abUDSwPGmKNTtqQhT1zl==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"}},{"Bucket":"buck1","Name":"go_113/src/cmd/internal/goobj/testdata/mycgo/c1.c","UserDef":{"X-Minio-Internal-Server-Side-Encryption-Iv":"I6SFAnqoJ98K0AAdrlVH+ULjc=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAJ5lm2MqilESi8QA+C1G7LdB...