graph_test.hpp:

  - Change the mysterious x's to v's.
  - Get the constness of the Graphs correct for
    test_readable_vertex_property_graph.


[SVN r23211]

libs/graph

@@ -1 +1 @@
-Subproject commit 9d467c8df1804c3327a49bfcd0669b8e7a27fcbc
+Subproject commit 34f46c045a125740800c8c584d03e0a3ebc4b8f6