From 0bc468f195e37a8a5f4f8b36ae6c92459e8ca652 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Thu, 22 Apr 2010 15:08:09 +0000
Subject: * Simplify the implementation of `with'.  This gives a 7% speedup in 
  evaluating the NixOS system configuration.

---
 src/libexpr/eval.hh | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/libexpr/eval.hh')

diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 2726fd971..6912e2288 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -106,6 +106,7 @@ struct Value
 struct Env
 {
     Env * up;
+    unsigned int prevWith; // nr of levels up to next `with' environment
     Value values[0];
 };
 
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