Maybe it worth using _STL_REPORT_ERROR instead of _MSVC_STL_DOOM_FUNCTION here, just to be consistent?

Thanks, updated PR title and description. The difference is significant, not cosmetic:

The UCRT's _RPTF0 is what pops up the nice assertion dialog in debug mode (or prints to stderr etc. if redirected). Without it, _MSVC_STL_DOOM_FUNCTION is just a __fastfail that makes the process vanish. I should have noticed this earlier - thanks for catching it.

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

Thanks for making this consistent, and easier to follow precedent in the future! 😻 🎉 🥳