> Of course, there's no reason why you can't write your own equivalents of assert and debug_assert in C, or any other language, but having them built into a language (or standard library)

Doesn't C have both static_assert and assert as part of the standard library?

The static_assert is a compile-time check. And it's C++11 and later, not C.

That's about runtime vs compile time assertions.

The article talks about something completely different.