OpenSSL::PKey::EC::Point#infinity?

static VALUE ossl_ec_point_is_at_infinity(VALUE self)
{
    EC_POINT *point;
    const EC_GROUP *group;

    GetECPoint(self, point);
    GetECPointGroup(self, group);

    switch (EC_POINT_is_at_infinity(group, point)) {
      case 1: return Qtrue;
      case 0: return Qfalse;
      default: ossl_raise(eEC_POINT, "EC_POINT_is_at_infinity");
    }

    UNREACHABLE;
}