code: func (b *Bundle) MustRender(c context.Context, e *Extra, out io.Writer, name string, args Args) {
  	blob, err := b.Render(c, e, name, args)
  	if err != nil {
  		panic(err)
  	}
  	_, err = out.Write(blob)
  	if err != nil {
  		panic(err)
  	}
  }
docs: // MustRender renders the template into the output writer or panics.
  //
  // It never writes partial output. It also panics if attempt to write to
  // the output fails.
  //
  // The bundle must be loaded by this point (via call to EnsureLoaded).