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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_bt804tmvsu7mtvcg04c82fp350, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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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 void ai_printParseTree(PTElement e) {
  ai_printParseTree(e, "");
}

static void ai_printParseTree(PTElement e, S indent) {
  if (e == null) ret with print("No parse tree");
  print(indent + e);
  indent += "  ";
  for (PTElement child : unnull(e.children))
    ai_printParseTree(child, indent);
}