go structs and interfaces

package main

import "fmt"
import "io"

type notACloser struct {
 Close func() error
}

func close() error {
  fmt.Println("Close called")
  return nil;
}

func closeme(cls io.Closer) {
  cls.Close()
}

func main() {
	nc := notACloser{Close:close}
	nc.Close()
	closeme(nc)
}