<div dir="ltr"><div class="gmail_extra"><div class="gmail_extra">Hello,</div><div class="gmail_extra"><br></div><div class="gmail_extra">Lens also uses it for combining indexed lenses: <a href="https://hackage.haskell.org/package/lens-4.13/docs/Control-Lens-Indexed.html#v:-60-.-62-">https://hackage.haskell.org/package/lens-4.13/docs/Control-Lens-Indexed.html#v:-60-.-62-</a></div><div class="gmail_extra"><br></div><div class="gmail_extra">Best regards,</div><div class="gmail_extra">Marcin Mrotek</div></div></div>