From CMS-699:

11:34:52            : Loading Pike modules ... pike/lib/modules/Standards.pmod/X509.pmod:1498:syntax error, unexpected '?'
pike/lib/modules/SSL.pmod/Constants.pmod:1303:Index 'X509' not present in module Standards.
pike/lib/modules/SSL.pmod/Constants.pmod:1303:Indexed module was: Standards.
pike/lib/modules/SSL.pmod/Constants.pmod:1303:Illegal program identifier: 0.

The code in question:

  foreach(verifiers || ({}), Verifier v) {
    if (v->verify(cert[1], cert[0]->get_der(), cert[2]->value,
                  options->?verifier_algorithms))
      return tbs;
  }

Note that Pike 8.0 modules must be syntax-compatible with all released versions of Pike 8.0 (or at least Pike 8.0.232 and later).