ref: 4b507ed83d4082d7001a1b8b78e7338c2beb2c38
dir: /sys/src/libmp/test/fns.h/
ldint* ldnew(int); void ldfree(ldint *); void testgen(int, ldint *); int ldmpeq(ldint *, mpint *); mpint* ldtomp(ldint *, mpint *); void mptarget(mpint *); void tests(void); void mpdiv_(mpint *, mpint *, mpint *, mpint *);