new test

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4296 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/preproc_5.i

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+%module preproc_5
+
+// Various preprocessor bits of nastiness.
+
+
+/* Test argument name substitution */
+#define foo(x,xx) #x #xx
+#define bar(x,xx) x + xx
+
+%constant char *a = foo(hello,world);
+%constant int   b = bar(3,4);
+
+// Wrap your brain around this one ;-)
+
+%{
+#define cat(x,y) x ## y
+%}
+
+#define cat(x,y) x ## y
+
+/* This should expand to cat(1,2);  
+   See K&R, p. 231 */
+
+%constant int c = cat(cat(1,2),;)
+
+#define xcat(x,y) cat(x,y)
+
+/* This expands to 123.  See K&R, p. 231 */
+%constant int d = xcat(xcat(1,2),3);
+
+