1#define foo(x) "x" 2#define bar(x) 'x' 3#define baz frob 4foo(3) 5bar(3) 6foo(baz) 7bar(baz) 8"baz" 9'baz' 10"foo(baz)" 11"bar(baz)" 12 13#define foo2(x) foo(x) 14#define bar2(x) bar(x) 15foo2(baz) 16bar2(baz) 17 18#define foo3(x) foo2(x) 19#define bar3(x) bar2(x) 20foo3(baz) 21bar3(baz) 22