render.go
func (render *Render) Funcs(funcMap template.FuncMap) *Template {
	tmpl := &Template{render: render, usingDefaultLayout: true}
	return tmpl.Funcs(funcMap)
}
func (render *Render) Funcs(funcMap template.FuncMap) *Template {
	tmpl := &Template{render: render, usingDefaultLayout: true}
	return tmpl.Funcs(funcMap)
}
// Funcs set helper functions for template with default "application" layout.