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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 5699d455cc0d..fed6d347266b 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -38,6 +38,8 @@ struct EvalState
     unsigned int nrEvaluated;
     unsigned int nrCached;
 
+    bool allowUnsafeEquality;
+
     EvalState();
 
     void addPrimOps();