From 4021d4d5ee7338ddaff4a1c5c2e41c85da206f18 Mon Sep 17 00:00:00 2001
From: Matthew Pickering <matthewtpickering@gmail.com>
Date: Tue, 8 Aug 2017 17:19:02 +0000
Subject: [PATCH 1/3] Make version a parameter in GHC HEAD derivation

If you want to override the source but the major version changes (ie 8.1
-> 8.3) then you also have to modify the version. Otherwise the build
will fail with difficult to understand errors, making version a
parameter makes it easy to override.
---
 pkgs/development/compilers/ghc/head.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index 5a505f39b1a..6573c60ac3a 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -5,6 +5,7 @@
   # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
 , enableIntegerSimple ? false, gmp
+, version ? "8.1.20170106"
 }:
 
 let
@@ -12,7 +13,6 @@ let
 
   commonBuildInputs = [ ghc perl autoconf automake happy alex python3 ];
 
-  version = "8.1.20170106";
   rev = "b4f2afe70ddbd0576b4eba3f82ba1ddc52e9b3bd";
 
   commonPreConfigure =  ''

From cf7b262485cc81feec53966fa8846d241bb78bca Mon Sep 17 00:00:00 2001
From: Matthew Pickering <matthewtpickering@gmail.com>
Date: Tue, 8 Aug 2017 17:21:22 +0000
Subject: [PATCH 2/3] Boot ghc HEAD with ghc-8.0.2

---
 pkgs/top-level/haskell-packages.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 81a32e1219f..09e3835712f 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -84,7 +84,7 @@ in rec {
       selfPkgs = packages.ghc821;
     };
     ghcHEAD = callPackage ../development/compilers/ghc/head.nix rec {
-      bootPkgs = packages.ghc7103;
+      bootPkgs = packages.ghc802;
       inherit (bootPkgs) alex happy;
       inherit buildPlatform targetPlatform;
       selfPkgs = packages.ghcHEAD;

From 770743bd91685befe4e3f1caee280d54c17aa641 Mon Sep 17 00:00:00 2001
From: Matthew Pickering <matthewtpickering@gmail.com>
Date: Tue, 8 Aug 2017 17:32:26 +0000
Subject: [PATCH 3/3] Bump ghc HEAD version ghc-8.3.20170808

---
 pkgs/development/compilers/ghc/head.nix | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index 6573c60ac3a..362b4895b7e 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -5,7 +5,7 @@
   # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
 , enableIntegerSimple ? false, gmp
-, version ? "8.1.20170106"
+, version ? "8.3.20170808"
 }:
 
 let
@@ -13,7 +13,7 @@ let
 
   commonBuildInputs = [ ghc perl autoconf automake happy alex python3 ];
 
-  rev = "b4f2afe70ddbd0576b4eba3f82ba1ddc52e9b3bd";
+  rev = "14457cf6a50f708eecece8f286f08687791d51f7";
 
   commonPreConfigure =  ''
     echo ${version} >VERSION
@@ -34,7 +34,7 @@ in stdenv.mkDerivation (rec {
   src = fetchgit {
     url = "git://git.haskell.org/ghc.git";
     inherit rev;
-    sha256 = "1h064nikx5srsd7qvz19f6dxvnpfjp0b3b94xs1f4nar18hzf4j0";
+    sha256 = "08vj9ca7rq7rv8pjfl14fg2lg9d6zisrwlq6bi5vzr006816dy8y";
   };
 
   postPatch = "patchShebangs .";