code: func (t *Template) Exec(ctx hctx.Context) (string, error) {
  	err := t.Parse()
  	if err != nil {
  		return "", err
  	}
  
  	ev := compiler{
  		ctx:     ctx,
  		program: t.program,
  	}
  
  	s, err := ev.compile()
  	return s, err
  }
docs: // Exec the template using the content and return the results