haskell-fgl: update ghc-8.6.x build to latest version

pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix

@@ -50,6 +50,7 @@ self: super: {
   cassava-megaparsec = doJailbreak super.cassava-megaparsec;
   config-ini = doJailbreak super.config-ini;   # https://github.com/aisamanra/config-ini/issues/18
   contravariant = self.contravariant_1_5;
+  fgl = self.fgl_5_7_0_1;
   free = self.free_5_1;
   haddock-library = dontCheck super.haddock-library_1_7_0;
   HaTeX = doJailbreak super.HaTeX;
@@ -81,10 +82,6 @@ self: super: {
   # https://github.com/tibbe/unordered-containers/issues/214
   unordered-containers = dontCheck super.unordered-containers;
 
-  # https://github.com/haskell/fgl/issues/79
-  # https://github.com/haskell/fgl/issues/81
-  fgl = appendPatch (overrideCabal super.fgl (drv: { editedCabalFile = null; })) ./patches/fgl-monad-fail.patch;
-
   # Test suite does not compile.
   cereal = dontCheck super.cereal;
   data-clist = doJailbreak super.data-clist;  # won't cope with QuickCheck 2.12.x

pkgs/development/haskell-modules/patches/fgl-monad-fail.patch

@@ -1,61 +0,0 @@
-From 344a7e452630ace0f5c647e525e0299d99de5902 Mon Sep 17 00:00:00 2001
-From: Alex Washburn <github@recursion.ninja>
-Date: Mon, 20 Aug 2018 23:46:32 -0400
-Subject: [PATCH] Fixing issue with MonadFailDesugaring.
-
----
- .travis.yml                   |  9 +++++++++
- Data/Graph/Inductive/Monad.hs | 14 ++++++++++++--
- fgl.cabal                     |  3 ++-
- 3 files changed, 23 insertions(+), 3 deletions(-)
-
-diff --git a/.travis.yml b/.travis.yml
-index db5eeb1..f026dd1 100644
---- a/Data/Graph/Inductive/Monad.hs
-+++ b/Data/Graph/Inductive/Monad.hs
-@@ -1,4 +1,4 @@
--{-# LANGUAGE MultiParamTypeClasses #-}
-+{-# LANGUAGE CPP, MultiParamTypeClasses #-}
- 
- -- (c) 2002 by Martin Erwig [see file COPYRIGHT]
- -- | Monadic Graphs
-@@ -19,6 +19,10 @@ module Data.Graph.Inductive.Monad(
- 
- 
- import Data.Graph.Inductive.Graph
-+#if MIN_VERSION_base(4,12,0)
-+import Control.Monad.Fail
-+import Prelude hiding (fail)
-+#endif
- 
- {-# ANN module "HLint: ignore Redundant lambda" #-}
- 
-@@ -39,7 +43,13 @@ import Data.Graph.Inductive.Graph
- 
- -- Monadic Graph
- --
--class (Monad m) => GraphM m gr where
-+class
-+#if MIN_VERSION_base(4,12,0)
-+ (MonadFail m)
-+#else
-+ (Monad m)
-+#endif
-+  => GraphM m gr where
-   {-# MINIMAL emptyM, isEmptyM, matchM, mkGraphM, labNodesM #-}
- 
-   emptyM     :: m (gr a b)
-diff --git a/fgl.cabal b/fgl.cabal
-index 4251a21..4b2a039 100644
---- a/fgl.cabal
-+++ b/fgl.cabal
-@@ -18,7 +18,8 @@ extra-source-files:
-                ChangeLog
- 
- tested-with:   GHC == 7.0.4, GHC == 7.2.2, GHC == 7.4.2, GHC == 7.6.3,
--               GHC == 7.8.4, GHC == 7.10.2, GHC == 8.0.1, GHC == 8.1.*
-+               GHC == 7.8.4, GHC == 7.10.2, GHC == 8.0.1, GHC == 8.2.2,
-+               GHC == 8.4.3, GHC == 8.6.1
- 
- source-repository head
-     type:         git