Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.

cc-crash.syn(532-5): Warning: Missing reduction procedure, R179
cc-crash.syn(533-5): Warning: Missing reduction procedure, R180
cc-crash.syn(598-5): Warning: Missing reduction procedure, R207
cc-crash.syn(1367-2): Warning: Conflicts resolved by precedence rules
cc-crash.syn(1367-2): Warning: Keyword anomalies found
Exit 0