pub unsafe extern "C" fn arb_sub(
z: *mut arb_struct,
x: *const arb_struct,
y: *const arb_struct,
prec: mp_limb_signed_t,
)pub unsafe extern "C" fn arb_sub(
z: *mut arb_struct,
x: *const arb_struct,
y: *const arb_struct,
prec: mp_limb_signed_t,
)