Function gr_poly_xgcd_wrapper 

pub unsafe extern "C" fn gr_poly_xgcd_wrapper(
    _xgcd_op: gr_method_poly_xgcd_op,
    G: *mut gr_poly_struct,
    S: *mut gr_poly_struct,
    T: *mut gr_poly_struct,
    A: *const gr_poly_struct,
    B: *const gr_poly_struct,
    ctx: *mut gr_ctx_struct,
) -> c_int