Added another unit test.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/unit_tests/preprocessor/output/concat-operator-ignore-non-args Sun Mar 07 08:08:35 2010 -0500
@@ -0,0 +1,6 @@
+// Should produce RIGHT and not WRONG
+#define RI WR
+#define GHT ONG
+#define z(a) RI##GHT
+z(1)
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/unit_tests/preprocessor/output/concat-operator-ignore-non-args.correct Sun Mar 07 08:08:35 2010 -0500
@@ -0,0 +1,1 @@
+RIGHT
\ No newline at end of file