From 91caf69a407d55ecc8c49c81d289f5f45170b2fa Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Fri, 19 Oct 2018 11:12:35 +0200
Subject: [PATCH] haskell-megaparsec: jailbreak to fix build with ghc-8.6.1

We cannot update to megaparsec-7.x because hledger does not support it.
---
 pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index 024d7ff3fff..1f019c1a582 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -59,7 +59,7 @@ self: super: {
   hspec-meta = self.hspec-meta_2_5_6;
   JuicyPixels = self.JuicyPixels_3_3_2;
   lens = self.lens_4_17;
-  megaparsec = dontCheck super.megaparsec_7_0_1;
+  megaparsec = dontCheck (doJailbreak super.megaparsec);
   neat-interpolation = dontCheck super.neat-interpolation_0_3_2_4;  # test suite depends on broken HTF
   patience = markBrokenVersion "0.1.1" super.patience;
   primitive = self.primitive_0_6_4_0;