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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 74a273b544..8df0084fd5 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -136,7 +136,7 @@ public:
        of the evaluation of the thunk.  If `v' is a delayed function
        application, call the function and overwrite `v' with the
        result.  Otherwise, this is a no-op. */
-    inline void forceValue(Value & v);
+    inline void forceValue(Value & v, const Pos & pos = noPos);
 
     /* Force a value, then recursively force list elements and
        attributes. */