#define /**/ ++ `mplus`		// not expected to work
#define 0   mzero		// not expected to work
#define x0  X'			// should work
#define x'  Xprime		// should work
#define `foo` .(foo)/**/,	// bizarreness

x ++ y = x0 * 0 * y `foo` x' 

//  /*