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-rw-r--r--src/libexpr/eval.hh3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 47e4d99bf6ed..6f1befa2a23e 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -71,7 +71,8 @@ public:
 
     const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
         sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
-        sFile, sLine, sColumn, sFunctor, sToString;
+        sFile, sLine, sColumn, sFunctor, sToString,
+        sRight, sWrong;
     Symbol sDerivationNix;
 
     /* If set, force copying files to the Nix store even if they