golang for select break小坑

package main

import "fmt"
import "log"

func main() {
      fmt.Println(test())
      
}

func test() bool {
      ch := make(chan int,30)
      for i := 0; i < 30; i++ {
            ch <- i
      }
     
      for {
            select {
                  case d :=<- ch:	
                        log.Printf("Executor received: %v", d)
                  default:
                        break 
            }
      }
      return true
}