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-rw-r--r--src/libexpr/nixexpr.hh5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 9234e2970ffa..d781d92ba78a 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -320,10 +320,11 @@ MakeBinOp(OpConcatLists, "++")
 
 struct ExprConcatStrings : Expr
 {
+    Pos pos;
     bool forceString;
     vector<Expr *> * es;
-    ExprConcatStrings(bool forceString, vector<Expr *> * es)
-        : forceString(forceString), es(es) { };
+    ExprConcatStrings(const Pos & pos, bool forceString, vector<Expr *> * es)
+        : pos(pos), forceString(forceString), es(es) { };
     COMMON_METHODS
 };