t.Fatalf("allocs = %v; want max 1", n)
	}
}

// https://golang.org/issues/13905
func TestUserDefinedBytes(t *testing.T) {
	type userDefinedBytes []byte
	var u userDefinedBytes
	v := []byte("foo")

	convertAssign(&u, v)
	if &u[0] == &v[0] {
		t.Fatal("userDefinedBytes got potentially dirty driver memory")
	}
}

type Valuer_V string

func (v Valuer_V) Value() (driver.Value, error) {