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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_ujm11k2pu77f51tc696de68ro3, 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 />
concept Bla {
  new Ref<Bla> ref;
}

svoid test_findBackRefs() {
  new Concepts cc;
  Bla a = cnew(cc, Bla);
  Bla b = cnew(cc, Bla, ref := a);
  assertEqualsVerbose(ll(b), findBackRefs Bla(a));
  cset(b, ref := null);
  assertEqualsVerbose(ll(), findBackRefs Bla(a));
  cset(a, ref := b);
  assertEqualsVerbose(ll(a), findBackRefs Bla(b));
  cdelete(a);
  assertEqualsVerbose(ll(), findBackRefs Bla(b));
}