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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static O ai_makeTester(Web web, S thing, S property) {
  WebNode node = web_findNodeWithForwardRelations(web, "A standard function that tests", "what", thing, "for property", property);
  if (node == null) fail("No tester for " + thing + " / " + property);
  fS sfName = assertNotNull(web_operandText(node, "is"));
  print("Using function: " + sfName);
  final Class c = loadFunctions_cached(sfName);
  ret func(O o) { call(c, sfName, o) };
}