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-rw-r--r--third_party/nix/src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/eval.hh b/third_party/nix/src/libexpr/eval.hh
index 199253bc451b..2c285ed5c111 100644
--- a/third_party/nix/src/libexpr/eval.hh
+++ b/third_party/nix/src/libexpr/eval.hh
@@ -42,6 +42,7 @@ struct Env : public gc {
   unsigned short prevWith : 14;  // nr of levels up to next `with' environment
   enum { Plain = 0, HasWithExpr, HasWithAttrs } type : 2;
   std::vector<Value*, traceable_allocator<Value*>> values;
+  Expr* withAttrsExpr = nullptr;
 };
 
 Value& mkString(Value& v, const std::string& s,