From 2989a23fca1e6f0d9c7627b41dc09fd8eb82e4f5 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 6 Feb 2026 14:55:57 +0100
Subject: [PATCH] builtins.flakeRefToString: Evaluate attributes

Fixes "attribute 'x' is a thunk".
---
 src/libflake/flake-primops.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libflake/flake-primops.cc b/src/libflake/flake-primops.cc
index 962edbb3d..a43777574 100644
--- a/src/libflake/flake-primops.cc
+++ b/src/libflake/flake-primops.cc
@@ -128,6 +128,7 @@ static void prim_flakeRefToString(EvalState & state, const PosIdx pos, Value **
     state.forceAttrs(*args[0], noPos, "while evaluating the argument passed to builtins.flakeRefToString");
     fetchers::Attrs attrs;
     for (const auto & attr : *args[0]->attrs()) {
+        state.forceValue(*attr.value, attr.pos);
         auto t = attr.value->type();
         if (t == nInt) {
             auto intValue = attr.value->integer().value;