From 5a07f707c58763a1e72e0ea0c046e060589d9cef Mon Sep 17 00:00:00 2001
From: Matt Sturgeon <matt@sturgeon.me.uk>
Date: Fri, 22 Aug 2025 18:29:32 +0100
Subject: [PATCH] lib.customisation.callPackageWith: fix line number
 interpolation

We need to use `toString` on `loc.line` because it is an int.
---
 lib/customisation.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/customisation.nix b/lib/customisation.nix
index 802c9ef9a4b8e..ba06dfb8055bc 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -287,7 +287,7 @@ rec {
           loc = builtins.unsafeGetAttrPos arg fargs;
         in
         "Function called without required argument \"${arg}\" at "
-        + "${loc.file}:${loc.line}${prettySuggestions (getSuggestions arg)}";
+        + "${loc.file}:${toString loc.line}${prettySuggestions (getSuggestions arg)}";
 
       # Only show the error for the first missing argument
       error = errorForArg (head (attrNames missingArgs));