This doesn't seem like an example of C++ not being a superset of C? While there's a significant difference in how the comma operator is specified between the tw

This doesn't seem like an example of C++ not being a superset of C? While there's a significant difference in how the comma operator is specified between the two languages, the C++ behavior is a superset of the C behavior. The C++ behavior is only different for constructs which aren't legal C.