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