Function mpoly_is_poly 

pub unsafe extern "C" fn mpoly_is_poly(
    Aexps: *const mp_limb_t,
    Alen: mp_limb_signed_t,
    Abits: mp_limb_t,
    var: mp_limb_signed_t,
    mctx: *mut mpoly_ctx_struct,
) -> c_int