From 1c1b3a93899e6182c3da91ebd1be05aca2a60613 Mon Sep 17 00:00:00 2001
From: David Arnold <david.arnold@iohk.io>
Date: Thu, 5 Jan 2023 13:17:58 -0500
Subject: [PATCH] fix: try to actually eval what will be ultimately evaluated

---
 lib/exportOverlays.nix | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/exportOverlays.nix b/lib/exportOverlays.nix
index 8579af3..4d792ad 100644
--- a/lib/exportOverlays.nix
+++ b/lib/exportOverlays.nix
@@ -49,7 +49,6 @@ let
         filter
         foldl'
         head
-        isAttrs
         isFunction
         listToAttrs
         mapAttrs
@@ -77,7 +76,7 @@ let
         then attrNames (overlay fakePkgs fakePkgs)
         else [ ];
 
-      isOverlay = it: isFunction it && isFunction (it fakePkgs) && (tryEval (isAttrs (it fakePkgs fakePkgs))).success;
+      isOverlay = it: isFunction it && isFunction (it fakePkgs) && (tryEval (attrNames (it fakePkgs fakePkgs))).success;
 
       # get all overlays from inputs
       inputOverlays = mapAttrs