From 1aa02b5c3802100dfba899dc63d143521c761b0d Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Fri, 25 Feb 2022 21:15:57 +0100
Subject: [PATCH] haskell.packages.ghc8{107,84}.OneTuple: provide hashable

We need to manually simulate the following conditional in the cabal
file:

    if impl(ghc >=9.0)
      build-depends: ghc-prim

    else
      build-depends: hashable >=1.3.5.0 && <1.5
---
 .../development/haskell-modules/configuration-ghc-8.10.x.nix | 5 +++++
 pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
index 466e25270193..7c6565072c13 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
@@ -105,4 +105,9 @@ self: super: {
 
   # weeder 2.3.0 no longer supports GHC 8.10
   weeder = doDistribute (doJailbreak self.weeder_2_2_0);
+
+  # OneTuple needs hashable instead of ghc-prim for GHC < 9
+  OneTuple = super.OneTuple.override {
+    ghc-prim = self.hashable;
+  };
 }
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 9257ebb1a308..2db51bbbfc4e 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix
@@ -142,4 +142,9 @@ self: super: {
     # https://github.com/haskell/haskell-language-server/issues/2728
     hls-hlint-plugin = null;
   });
+
+  # OneTuple needs hashable instead of ghc-prim for GHC < 9
+  OneTuple = super.OneTuple.override {
+    ghc-prim = self.hashable;
+  };
 }