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func main() {
v:="aaaaaa"
s,ok:=v.(string)
fmt.Printf("%s:%b\n",s,ok)
}
invalid type assertion: v.(string) (non-interface type string on left)
func main() {
v:="aaaaaa"
checkit(v)
}
func checkit(v interface{}){
s,ok:=v.(string)
fmt.Printf("%s:%b\n",s,ok)
}