Eelco merged our PR for the basic error format code, so now we have a bit of code in nix! Phase 1 - get the new error format running in C++ - is complete.

The new code isn't being used to print errors just yet. That's the goal of phase 2, which is under way now. There are a number of different error-delivery systems to test, and I'll be touching many of the existing error calls throughout the code - over 400 so far.

Thanks again to our contributors! I'll update again when phase 2 is nearing completion.