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-rw-r--r--third_party/nix/src/libexpr/eval.cc1
1 files changed, 0 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/eval.cc b/third_party/nix/src/libexpr/eval.cc
index 704a05b197ba..5f267f2053fb 100644
--- a/third_party/nix/src/libexpr/eval.cc
+++ b/third_party/nix/src/libexpr/eval.cc
@@ -1252,7 +1252,6 @@ void EvalState::concatLists(Value& v, const NixList& lists, const Pos& pos) {
 
   auto outlist = new (GC) NixList();
 
-  size_t len = 0;
   for (Value* list : lists) {
     forceList(*list, pos);
     outlist->insert(outlist->end(), list->list->begin(), list->list->end());