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-rw-r--r--src/libexpr/eval.hh4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index c820b28f49ae..6f6b2a9009fe 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -52,8 +52,8 @@ struct PrimOp
 struct Env
 {
     Env * up;
-    unsigned int prevWith; // nr of levels up to next `with' environment
-    Expr * withAttrs;
+    unsigned short prevWith; // nr of levels up to next `with' environment
+    bool haveWithAttrs;
     Value * values[0];
 };