What steps will reproduce the problem?
package main
import (
    "html/template"
    "os"
)
func main() {
    t1, _ := template.New("xml").Parse(`<?xml version="1.0"?><feed></feed>`)
    t1.Execute(os.Stdout, nil)
}

What is the expected output?

<?xml vesion="1.0"?><feed></feed>

What do you see instead?

&lt;?xml version="1.0"?><feed></feed>

Which compiler are you using (5g, 6g, 8g, gccgo)?

6g

Which operating system are you using?

linux

Which revision are you using?  (hg identify)

767b6229d4dc tip

Please provide any additional information below.

I'm not sure it's ok to use html/template for xml generation, but encoding/xml provides
only xml parsing, and we may need lots of escape with text/template.