RosettaCodeData/Task/Y-combinator/Order/y-combinator.order

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#include <order/interpreter.h>
#define ORDER_PP_DEF_8y \
ORDER_PP_FN(8fn(8F, \
8let((8R, 8fn(8G, \
8ap(8F, 8fn(8A, 8ap(8ap(8G, 8G), 8A))))), \
8ap(8R, 8R))))
#define ORDER_PP_DEF_8fac \
ORDER_PP_FN(8fn(8F, 8X, \
8if(8less_eq(8X, 0), 1, 8times(8X, 8ap(8F, 8minus(8X, 1))))))
#define ORDER_PP_DEF_8fib \
ORDER_PP_FN(8fn(8F, 8X, \
8if(8less(8X, 2), 8X, 8plus(8ap(8F, 8minus(8X, 1)), \
8ap(8F, 8minus(8X, 2))))))
ORDER_PP(8to_lit(8ap(8y(8fac), 10))) // 3628800
ORDER_PP(8ap(8y(8fib), 10)) // 55