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-rw-r--r--src/libexpr/nixexpr.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 0422e5cf4638..f9ed34f58a3c 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -170,6 +170,7 @@ struct ExprWith : Expr
 {
     Pos pos;
     Expr * attrs, * body;
+    int prevWith;
     ExprWith(const Pos & pos, Expr * attrs, Expr * body) : pos(pos), attrs(attrs), body(body) { };
     COMMON_METHODS
 };