From 0ef2bbfd0ba2b2c0db6f5f4e01f8d8c2e556b329 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
Date: Sun, 12 May 2019 23:55:19 +0200
Subject: [PATCH] haskell: servant: Don't hardcode $doc.

Until now this broke on `enableSeparateDocOutput = false`,
as then `$doc` was not defined so it tried to copy stuff to
`/share/doc/servant`.

Fixes regression introduced in commit be63b1994d75e826eb2ba2b9e319f1f25be8b725.
---
 pkgs/development/haskell-modules/configuration-common.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 1ab376ab103..ba1e461feab 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -765,7 +765,7 @@ self: super: {
       };
     in overrideCabal super.servant (old: {
       postInstall = old.postInstall or "" + ''
-        ln -s ${docs} $doc/share/doc/servant
+        ln -s ${docs} ''${!outputDoc}/share/doc/servant
       '';
     });