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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 4e66c4dfcc91..a1f26a0566d1 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -232,6 +232,8 @@ public:
     void mkAttrs(Value & v, unsigned int expected);
     void mkThunk_(Value & v, Expr * expr);
 
+    void concatLists(Value & v, unsigned int nrLists, Value * * lists);
+
     /* Print statistics. */
     void printStats();