title: finding reverse dependencies of package on `hackage`
body: <p>The website <a href="https://packdeps.haskellers.com" rel="noreferrer">packdeps</a> allows to search for reverse dependencies of libraries published on hackage.</p>
  <p>However, not every package from hackage seem to be listed there, say <a href="https://hackage.haskell.org/package/algebraic-classes" rel="noreferrer">algebraic-classes</a></p>
  <p>Is there any alternative way to find the reverse dependencies of a generic hackage package ?</p>