golang 方法内部定义子方法及调用

package main
 
import (
    "fmt"
    "reflect"
)
 
func out(ch chan int) {
    <-ch
    fmt.Println(" test out func define")
}
func main() {
    //-----------------外部方法--------------------
    ch := make(chan int)
    go out(ch)
    ch <- 
 
    //-----------------内部方法--------------------
    cha := make(chan int)
    var c = func(cha chan int) {
        <-cha
        fmt.Println(" test iner func define")
    }
    go c(cha)
    cha <-
}