For Haskell in particular, you are better off using Hoogle [1] or Hayoo [2].
[1]: https://www.haskell.org/hoogle/?hoogle=%3E%3D%3E [2]: http://hayoo.fh-wedel.de/?query=%3E%3D%3E
[1]: https://www.haskell.org/hoogle/?hoogle=%3E%3D%3E [2]: http://hayoo.fh-wedel.de/?query=%3E%3D%3E