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* VCD output for waveform viewing
* Enumeration types support
* Inferring the sensitivity list for combinatorial logic
* Inferring the list of instances
* Inferring the list of processes
* Class intbv enhancements
* Function concat()
* Python 2.3 support
For full details about the changes, consult:
http://old.myhdl.org/doc/0.3/whatsnew03/whatsnew03.html