From 6a70e4e66372c7fad9c1de060339b463d1364399 Mon Sep 17 00:00:00 2001
From: Profpatsch <mail@profpatsch.de>
Date: Sun, 25 Feb 2018 18:03:52 +0100
Subject: [PATCH] dhall: passthru dhall prelude
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Makes it possible to reference `dhall.prelude`, the same version that comes with
the dhall exetutable’s source code.
---
 .../development/interpreters/dhall/default.nix | 18 ++++++++++++++++++
 pkgs/top-level/all-packages.nix                |  2 +-
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/interpreters/dhall/default.nix

diff --git a/pkgs/development/interpreters/dhall/default.nix b/pkgs/development/interpreters/dhall/default.nix
new file mode 100644
index 00000000000..8e1df36e412
--- /dev/null
+++ b/pkgs/development/interpreters/dhall/default.nix
@@ -0,0 +1,18 @@
+{ haskell, haskellPackages, stdenvNoCC }:
+
+let
+  static = haskell.lib.justStaticExecutables haskellPackages.dhall;
+
+in static.overrideAttrs (old: {
+  passthru = old.passthru or {} // {
+    prelude = stdenvNoCC.mkDerivation {
+      name = "dhall-prelude";
+      inherit (old) src;
+      phases = [ "unpackPhase" "installPhase" ];
+      installPhase = ''
+        mkdir $out
+        cp -r Prelude/* $out/
+      '';
+    };
+  };
+})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 619ca44f001..470291b71b0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6823,7 +6823,7 @@ with pkgs;
 
   clooj = callPackage ../development/interpreters/clojure/clooj.nix { };
 
-  dhall = haskell.lib.justStaticExecutables haskellPackages.dhall;
+  dhall = callPackage ../development/interpreters/dhall { };
 
   dhall-nix = haskell.lib.justStaticExecutables haskellPackages.dhall-nix;