From b4d17f0cfa3f1154d85b8b1a179b31245af81500 Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Sat, 11 Apr 2026 14:23:57 +0200
Subject: [PATCH] haskell.compiler.native-bignum: don't evaluate compiler exprs

This makes isNativeBignumGhc purely textual again after #460845.
Could improve performance in the right conditions, but most importantly
solves eval issues with aliases allowed (due to the throw-ing ghc
attributes) without resorting to tryEval.
---
 pkgs/top-level/haskell-packages.nix | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index a8146c05d831..6deb331822d1 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -224,8 +224,7 @@ in
       native-bignum =
         let
           isNativeBignumGhc =
-            name:
-            !(builtins.elem name nativeBignumExcludes) && !(compiler.${name} ? isMhs && compiler.${name}.isMhs);
+            name: pkgs.lib.hasPrefix "ghc" name && !(builtins.elem name nativeBignumExcludes);
           nativeBignumGhcNames = pkgs.lib.filter isNativeBignumGhc (pkgs.lib.attrNames compiler);
         in
         pkgs.lib.recurseIntoAttrs (