diff -r d356e54bdafc -r 874e4bc21435 lemon/lemon_reader.h
--- a/lemon/lemon_reader.h	Wed Oct 26 11:10:18 2005 +0000
+++ b/lemon/lemon_reader.h	Fri Oct 28 08:40:42 2005 +0000
@@ -409,6 +409,9 @@
     LemonReader(const std::string& filename) 
       : is(0), own_is(true) {
       is = new std::ifstream(filename.c_str());
+      if (is->fail()) {
+	throw FileOpenError(filename);
+      }
     }
 
     /// \brief Desctructor for LemonReader.