From ff9e4bce32b35ab6fc61e8ad64e5b91c0624c5b4 Mon Sep 17 00:00:00 2001
From: Thomas Miedema <thomasmiedema@gmail.com>
Date: Mon, 17 Mar 2025 08:16:53 +0100
Subject: [PATCH] haskell: fix shellFor test

In #296645, envFunc (and thus shellFor) was changed from
`mkDerivation {phases=[..]}` to `runCommand ..`. So since
then, the derivation of shellFor contains a `buildCommand`
("echo $nativeBuildInputs $buildInputs > $out"),
and as a result the custom phases defined in shellFor's
test were ignored.
---
 pkgs/test/haskell/shellFor/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/test/haskell/shellFor/default.nix b/pkgs/test/haskell/shellFor/default.nix
index 3e0f3ed74934..87671f4bc798 100644
--- a/pkgs/test/haskell/shellFor/default.nix
+++ b/pkgs/test/haskell/shellFor/default.nix
@@ -68,4 +68,8 @@
         maintainers = allMaintainers;
         inherit (cabal-install.meta) platforms;
       };
+    # `shellFor` adds a `buildCommand` (via `envFunc -> runCommandCC`), which
+    # overrides custom phases. To ensure this test's phases run, we remove
+    # that `buildCommand` from the derivation.
+    buildCommand = null;
   })