nil and interfaces

gistfile1.go

package main

import (
	"os"
	"fmt"
)

type Test struct {
	Msg string
}

func (self *Test) String() string {
	if self != nil {
		return self.Msg
	}
	return "dummy"
}

func doSomething() *Test {
	return nil
}

func test() os.Error {
	return doSomething()
}

func main() {
	err := test()
	if err != nil {
		fmt.Printf("Test %T %p %s\n", err, err, err)
	}
}