My comment on the PR:
Once MIR is on the likelyhood of us turning it back off seems very low, so I have to disagree with this. We must hold the line on performance - we have already regressed compile time performance badly this year. Do we have evidence that compile time, run time and code size are on par with oldtrans?
I see some encouraging runtime benchmarks in this thread, but not compile time, and not code size. Can somebody point me to anything definitive on them (apologies that I'm not familiar with all the measurements done so far)?