Tweak graph500-bfs so it pretty-prints

Author: brson

src/test/bench/graph500-bfs.rs

@@ -1,11 +1,11 @@
+#[legacy_modes];
+
 /*!
 
 An implementation of the Graph500 Breadth First Search problem in Rust.
 
 */
 
-#[legacy_modes];
-
 extern mod std;
 use std::arc;
 use std::time;