quoted

* Would you ever like to avoid reserved identifiers in such source code?
  https://wiki.sei.cmu.edu/confluence/display/c/DCL37-C.+Do+not+declare+or+define+a+reserved+identifier

we already don't care about this guideline (see __guard_ptr())

Please take another look at name conventions.
How do you think about to avoid that this software depends on undefined behaviour?

Regards,
Markus