ref: 9537bdd2580a9bb6f44b0a6ae6f0b1a71cbd4734 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)