rand.Intn should not return a fixed number sequence

[gopherbot]

by nanjunjie:

From document of rand.Intn:
Intn returns, as an int, a non-negative pseudo-random number in [0,n). It panics if n
<= 0.

I found it always returns a fixed number sequence. For example on my machine, the
sequence for Intn(10) is: :8, 6, 6, 7, 0...

What steps will reproduce the problem?
Source:
package main

import (
    "fmt"
    "math/rand"
)

func main() {
    fmt.Println(rand.Intn(10))
}

Link: http://play.golang.org/p/1EUY0jaitW

What is the expected output?
It should return a random number. 

What do you see instead?
On play.golang.org, the output is always 1 for each run. On my machine, the output is
always 8.

Which operating system are you using?
Ubuntu 12.04

Which version are you using?  (run 'go version')
go version devel +ea15e7ed6d72 Sun Dec 09 03:59:33 2012 -0500

Please provide any additional information below.

[rsc]

Comment 1:

You need to seed the generator. For example: rand.Seed(time.Now().UnixNano()).

[rsc]

Comment 2:

The new example (http://tip.golang.org/pkg/math/rand/#example_) will
be in Go 1.1 and should make this clear.

Status changed to WorkingAsIntended.