Earlier quoted context omitted.
It would be part of the upcoming Hardcore mode, in which not only are intellisense and on-the-fly error checking disabled, but if your code fails to compile first time, it deletes the entire source tree.
Wouldn't that be more aptly named 'Nightmare mode?'
I found "Hardcore" more appropriate; reminds me of Diablo 2's Hardcore mode where your character can't be recovered after any single death. "Nightmare" takes me back to Doom where it was just a harder mode, without the extra "permanent death" rule.
Sorry, that's my pedantry out of the way for the morning :)