型アサーション(type assertion) と chan

gistfile1.go

package main

import (
    "fmt"
    "reflect"
)

type chanS interface{
	Type() reflect.Type
}

func main() {
	ch1 := make(chan int)
    
    go func() {
        for i := 0; i < 10; i++{
            ch1<- i
        }
        close(ch1)
    }()
    
    for v := range ch1 {
    	fmt.Println(v)  
    }

    s, ok := ch1.(chanS)
    fmt.Println(ok)


}

gistfile2.txt

prog.go:26: invalid type assertion: ch1.(chanS) (non-interface type chan int on left)
 [process exited with non-zero status]

s, ok := interface{}(ch1).(chanS)
fmt.Println(ok, s)

via http://mattn.kaoriya.net/software/lang/go/20130919023425.htm

http://qiita.com/kokardy/items/d3be8f8081f1a4438cc7