From 2ee88b6041557beb517b100c3f608ebfc5eb725d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 10 Jun 2020 08:30:29 +0200
Subject: Fix bug in subscript of NULL values

---
 libbuild2/parser.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index e6a1c6a..db00633 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -6016,7 +6016,9 @@ namespace build2
             //
             // Note that result may or may not point to result_data.
             //
-            if (result->type == nullptr)
+            if (result->null)
+              result_data = value ();
+            else if (result->type == nullptr)
             {
               const names& ns (result->as<names> ());
 
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