//		Execution stops immediately with an error.
func (t *Template) Option(opt ...string) *Template {
	t.text.Option(opt...)
	return t
}

// checkCanParse checks whether it is OK to parse templates.
// If not, it returns an error.
func (t *Template) checkCanParse() error {
	if t == nil {
		return nil
	}
	t.nameSpace.mu.Lock()
	defer t.nameSpace.mu.Unlock()
	if t.nameSpace.escaped {