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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 eba97dd73756..7369892fbccd 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -135,6 +135,8 @@ private:
 
     bool allowUnsafeEquality;
 
+    ATermMap parseTrees;
+
 public:
     
     EvalState();