Function arb_dot 

pub unsafe extern "C" fn arb_dot(
    res: *mut arb_struct,
    initial: *const arb_struct,
    subtract: c_int,
    x: arb_srcptr,
    xstep: mp_limb_signed_t,
    y: arb_srcptr,
    ystep: mp_limb_signed_t,
    len: mp_limb_signed_t,
    prec: mp_limb_signed_t,
)