Function gmp_mpfr_sys::mpfr::mpfr_set_si_2exp

pub unsafe extern fn mpfr_set_si_2exp(rop: *mut __mpfr_struct,
                                      op: c_long,
                                      e: mpfr_exp_t,
                                      rnd: mpfr_rnd_t)
                                      -> c_int