From 6ec852e7f07e9bd534cd0327b07c5a2df0e06218 Mon Sep 17 00:00:00 2001
From: regnat <rg@regnat.ovh>
Date: Thu, 3 Jun 2021 10:35:51 +0200
Subject: [PATCH] Simplify the forcing of nested records

---
 src/libexpr/eval.cc | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 5acbf50d7..e94e64346 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1212,18 +1212,16 @@ bool EvalState::getAttrField(Value & attrs, const std::vector<Symbol> & selector
         for (auto & name : selector) {
             nrLookups++;
             Bindings::iterator j;
-            forceValue(*vAttrs, pos);
             if (vAttrs->type() != nAttrs ||
                 (j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) {
                 return false;
             }
             vAttrs = j->value;
             pos2 = j->pos;
+            forceValue(*vAttrs, pos2 != NULL ? *pos2 : pos );
             if (countCalls && pos2) attrSelects[*pos2]++;
         }
 
-        forceValue(*vAttrs, ( pos2 != NULL ? *pos2 : pos ) );
-
     } catch (Error & e) {
         if (pos2 && pos2->file != sDerivationNix) {
             vector<string> strSelector;