package main

import (
	"os"
	"strings"
	"text/template"
)

var TMPL = strings.Trim(`
{{- /* []string expected */}}
{{- define "sasakuna"}}
{{- range $i, $text := . }}
{{$i}}: {{$text}}
{{- end }}
{{- end }}
`, "\n")

func main() {
	tmpl := template.Must(template.New("").Parse(TMPL))
	tmpl = template.Must(tmpl.Parse(`{{ template .Name .Data}}`))

	tmpl.Execute(os.Stdout, struct {
		Name string
		Data []string
	}{
		Name: "sasakuna",
		Data: []string{"sasa", "kuna"},
	})

	// Output:
	// panic: template: :1: unexpected ".Name" in template clause
}