It declares STDC_VERSION 202311L but still doesn't support this feature:
https://en.cppreference.com/w/c/compiler_support/23
The EDG frontend is used by intellisense, which is the default
engine in VSCode, so parsing is currently broken and tons of
spurious errors are shown. Skip this feature when this
compiler frontend is used.
Follow-up for 92100f14c3