From 8e4cd524c7be0e94e4e94e786cd4701c213c05a7 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Sun, 12 May 2019 09:36:13 +0000
Subject: [PATCH] haskell-lens: patch (and jailbreak) to fix build with
 ghc-8.8.x

---
 pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
index d5a9a5f4e72..e02e9351c6d 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
@@ -195,5 +195,9 @@ self: super: {
     url = "https://raw.githubusercontent.com/hvr/head.hackage/master/patches/shakespeare-2.0.20.patch";
     sha256 = "1dgx41ylahj4wk8r422aik0d7qdpawdga4gqz905nvlnhqjla58y";
   });
+  lens = appendPatch (doJailbreak super.lens) (pkgs.fetchpatch {
+    url = "https://raw.githubusercontent.com/hvr/head.hackage/master/patches/lens-4.17.1.patch";
+    sha256 = "0w89ipi6dfkx5vlw4a64hh6fd0bm9hg33mwpghliyyxik5jmilv1";
+  });
 
 }