diff --git a/_demo/cchan/cchan.go b/_demo/cchan/cchan.go
index 29b11ecc..f7c91b79 100644
--- a/_demo/cchan/cchan.go
+++ b/_demo/cchan/cchan.go
@@ -23,4 +23,5 @@ func doChan(cap int) {
 
 func main() {
 	doChan(10)
+	doChan(0)
 }