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-rw-r--r--src/libexpr/eval.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index d74a0350624d..9144d99a4b38 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -310,6 +310,9 @@ private:
     unsigned long nrValues;
     unsigned long nrListElems;
     unsigned long nrEvaluated;
+    unsigned long nrAttrsets;
+    unsigned long nrOpUpdates;
+    unsigned long nrOpUpdateValuesCopied;
     unsigned int recursionDepth;
     unsigned int maxRecursionDepth;
     char * deepestStack; /* for measuring stack usage */