ref: e43e3872b43d9c1b49e9e5c015b32258c3735ad8
dir: /tests/cc/execute/0152-cat.c/
#define CAT(x,y) x ## y #define XCAT(x,y) CAT(x,y) #define FOO foo #define BAR bar int main(void) { int foo, bar, foobar; CAT(foo,bar) = foo + bar; XCAT(FOO,BAR) = foo + bar; return 0; }