Yes, absolutely. I have a theory that a big part of the reason clang leapfrogged g++ so quickly on these things is because it was (initially aiming to) dogfood

Yes, absolutely. I have a theory that a big part of the reason clang leapfrogged g++ so quickly on these things is because it was (initially aiming to) dogfood itself, So getting better error messages than g++ could give was an early and high priority task to its first users.