From 8f72b8a5c0c1e16b8538642da9d0b6f9148e8b26 Mon Sep 17 00:00:00 2001
From: Kosyrev Serge <serge.kosyrev@iohk.io>
Date: Mon, 12 Mar 2018 02:23:06 +0300
Subject: [PATCH] ghc841:  bv fixed upstream

---
 .../haskell-modules/configuration-ghc-8.4.x.nix      | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
index bca1e1c1b48..1582dfe8612 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -182,6 +182,18 @@ self: super: {
   ## Upstreamed
 
   ## Upstreamed, awaiting a Hackage release
+  bv = overrideCabal super.bv (drv: {
+    ##     • No instance for (GHC.Base.Semigroup BV)
+    ##         arising from the superclasses of an instance declaration
+    ##     • In the instance declaration for ‘Monoid BV’
+    src = pkgs.fetchFromGitHub {
+      owner  = "iagoabal";
+      repo   = "haskell-bv";
+      rev    = "92932a75719020d6a8ac55c455e5c03a4304043f";
+      sha256 = "0fi4v9mpw5y9q1pm7lqhm2zazfyy921wpaa28125misix0frasfw";
+    };
+  });
+
   haskell-gi = overrideCabal super.haskell-gi (drv: {
     ## Setup: Encountered missing dependencies:
     ## haskell-gi-base ==0.20.*