From 75313e6fead3b82a4be2d37b341a735f7b61279b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 15 Jun 2018 12:38:50 +0200
Subject: Add sanity check

---
 build2/algorithm.cxx | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'build2/algorithm.cxx')

diff --git a/build2/algorithm.cxx b/build2/algorithm.cxx
index 6743907..7e68a36 100644
--- a/build2/algorithm.cxx
+++ b/build2/algorithm.cxx
@@ -439,6 +439,8 @@ namespace build2
 
           const rule_match* r (match_impl (a, t, nullptr, try_match));
 
+          assert (l.offset != target::offset_tried); // Should have failed.
+
           if (r == nullptr) // Not found (try_match == true).
           {
             l.offset = target::offset_tried;
-- 
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