From chrisdone at gmail.com  Thu Apr  6 14:07:02 2017
From: chrisdone at gmail.com (Christopher Done)
Date: Thu, 6 Apr 2017 16:07:02 +0200
Subject: [Hs-Generics] gdiff-ig package difficult to use
Message-ID: <CAAJHNPBQx-PsNK2-coQZOQQ24yK_f+7fdOP-RBPmxq=aPB9YAw@mail.gmail.com>

>From the haddocks API of gdiff-ig it seems that you can’t actually use
it for something useful:

http://hackage.haskell.org/package/gdiff-ig-0.1.1

The EditScript type is not exported. Thought someone might want to fix
it. There is a test suite using the package:

http://hackage.haskell.org/package/gdiff-ig-0.1.1/src/examples/Test.hs

But it doesn’t actually inspect EditScript, it just uses its equality instance.

You can only use it with patch, but in order to get a EditScript you
need both values, so there’s no point in doing let p = diff a b in
patch p a, you might as well just use b. And EditScript can’t be
serialized.

Ciao!