From 5779fdb3d0534aff0690b7c6242c1f3123dcd959 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Mon, 24 Sep 2018 18:34:04 -0400
Subject: [PATCH] haskellPackages: Avoid outer `rec { .. }`

This is much nicer for overlays. For example, if someone binds a new
compiler / package set, its integer-simple variation will automatically
appear.
---
 pkgs/top-level/haskell-packages.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 0dd0e8edf17..92fbdd85b35 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -36,7 +36,10 @@ let
     });
   };
 
-in rec {
+  # Use this rather than `rec { ... }` below for sake of overlays.
+  inherit (pkgs.haskell) compiler packages;
+
+in {
   lib = haskellLib;
 
   compiler = {