ref: 92a6483fc287984ca6b5c40c480f7d7d0c7b5fc7 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)