fmt: Printf loops on invalid verb spec #10674

package main

import (
    "text/template"
    "io/ioutil"
)

func main() {
    t, err := template.New("foo").Parse(data)
    if err != nil {
        return
    }
    t.Execute(ioutil.Discard, nil)
}

var data = "{{printf \"%017091901790959340919092959340919017929593813360\" 0}}"