From a5fe73094016973a50741db0c5d51ca96c14147b Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 4 Apr 2014 21:14:11 +0200
Subject: forceString: Show position info

---
 src/libexpr/nixexpr.hh | 4 ++++
 1 file changed, 4 insertions(+)

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

diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 527589147e9c..9234e2970ffa 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -28,6 +28,10 @@ struct Pos
     Pos() : line(0), column(0) { };
     Pos(const Symbol & file, unsigned int line, unsigned int column)
         : file(file), line(line), column(column) { };
+    operator bool() const
+    {
+        return line != 0;
+    }
     bool operator < (const Pos & p2) const
     {
         if (!line) return p2.line;
-- 
cgit 1.4.1