ref: 9a91d5b20e00cf2a74ef82aa0d6f1f4d847dc04f dir: /cmd/cpp/cycle.test/
#define A B #define B A A B #define X(x) Y(x) #define Y(x) X(x) X(1) Y(1) #define R(x) RS #define RS R(x) RS R(1)