Variadic macro no comma

[Rule]

Consider the snippet below. When you omit the last argument to a variadic macro, you may omit the preceding comma as well.

Code: Select all

#define FOO(a,b...) print a;b

FOO()
FOO(,)
FOO(x)
FOO(x,)
FOO(x,y,z)

Expands without any problem to:

Code: Select all

 print ;
 print ;
 print x;
 print x;
 print x;y,z
 

Perhaps not a big deal, but still a nice feature I think.