CBD model is computing Fibonacci numbers! :)

examples/cbd/models/r_advance_time_nac.od

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+
+# If there is a Delay-block whose input signal differs from its state, we cannot yet advance time:
+
+delay:RAM_Delay
+
+delay_in:RAM_InPort
+
+delay_has_input:RAM_hasInPort (delay -> delay_in)
+
+some_outport:RAM_OutPort
+
+delay_in_conn:RAM_link (some_outport -> delay_in)
+
+in_signal:RAM_Signal
+
+port_has_signal:RAM_hasSignal (some_outport -> in_signal)
+
+state:RAM_State {
+  RAM_x = `get_slot_value(matched('in_signal'), 'x') != get_value(this)`;
+}
+
+delay_to_state:RAM_delay2State (delay -> state)
+
+
+# Also, we cannot advance time until all outports have signals:
+
+:GlobalCondition {
+  condition = ```
+    missing_signals = False
+    for _, outport in get_all_instances("OutPort"):
+      if len(get_outgoing(outport, 'hasSignal')) == 0:
+        missing_signals = True
+        break
+    missing_signals
+  ```;
+}