Moving goal posts are we?

Should I list all the compiler specific features that everyday C programmer uses but aren't defined in ANSI C, e.g. inline assembly?

No professional Pascal compiler was a pure ISO Pascal, that error was left for schools teaching bad Pascal.

Professional Pascal compilers were way more powerful than C, safer and in the days of K&R C chaos, just as portable.

I have made no comment about the quality of Pascal vs. C. In fact I like Pascal a lot, my comment is just on the way to write idiomatic code in each language. In C it is much easier and common to traverse data structures. Pascal may do it in some implementations, but its not how programmers used to organize their code. This just means that for C programmers it is frequently easier to work with NULL terminated strings.