From 3f88b15256fadfca1f19dfd9fbb7d4a1644620d2 Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Mon, 7 Feb 2022 20:48:37 +0100
Subject: [PATCH] haskellPackages: preserve ghc-exactprint 1.4.1

We'll continue using this version for GHC 9.2.1. 1.5.0 changes behavior
in a breaking way, but the API stays the same, making it a risky
upgrade. Hopefully dependents will tell us via version constraints what
to use in the future.
---
 .../configuration-hackage2nix/main.yaml             |  1 +
 .../haskell-modules/hackage-packages.nix            | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
index 56a6cb41cbaf..0be927f61258 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
@@ -168,6 +168,7 @@ extra-packages:
   - path == 0.9.0                       # 2021-12-03: path version building with stackage genvalidity and GHC 9.0.2
   - ormolu == 0.3.*                     # 2021-12-03: for HLS with GHC 9.0.2
   - fourmolu == 0.4.*                   # 2022-02-05: for HLS with GHC 9.0.2
+  - ghc-exactprint == 1.4.*             # 2022-02-07: preserve for now, 1.5.0 has a breaking change without type changes
 
 package-maintainers:
   abbradar:
diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 7b0541f4c791..9e1914b3b97f 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -106181,6 +106181,19 @@ self: {
        license = lib.licenses.bsd3;
      }) {};
 
+  "ghc-exactprint_1_4_1" = callPackage
+    ({ mkDerivation }:
+     mkDerivation {
+       pname = "ghc-exactprint";
+       version = "1.4.1";
+       sha256 = "0q9z43753arxbcs6mz26kz4dsz0c2i5hkxa125gl36vsipxfrq92";
+       isLibrary = true;
+       isExecutable = true;
+       description = "ExactPrint for GHC";
+       license = lib.licenses.bsd3;
+       hydraPlatforms = lib.platforms.none;
+     }) {};
+
   "ghc-exactprint_1_5_0" = callPackage
     ({ mkDerivation }:
      mkDerivation {