Golang: output3() #hacking

// add this code to $GOROOT/src/pkg/os/exec/exec.go
// then rebuild golang
// cd $GOROOT/src && ./make.bash
func (c *Cmd) Output3() ([]byte, []byte, error) {
        if c.Stdout != nil || c.Stderr != nil {
                return nil, nil, errors.New("exec: Stdout or Stderr already set")
        }
        var o bytes.Buffer
        var e bytes.Buffer
        c.Stdout = &o
        c.Stderr = &e
        err := c.Run()
        return o.Bytes(), e.Bytes(), err
}