RosettaCodeData/Task/Factorial/Order/factorial-2.order

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#include <order/interpreter.h>
#define ORDER_PP_DEF_8fac \
ORDER_PP_FN(8fn(8N, \
8let((8F, 8fn(8I, 8A, 8G, \
8if(8greater(8I, 8N), \
8A, \
8apply(8G, 8seq_to_tuple(8seq(8inc(8I), 8mul(8A, 8I), 8G)))))), \
8apply(8F, 8seq_to_tuple(8seq(1, 1, 8F))))))
ORDER_PP(8to_lit(8fac(8))) // 40320