New messages-buffer-mode in Emacs 24.408 Jul 2014, by Artur Malabarba.
I've been using 24.4 for months now, yet only today I came to
*Messages* buffer has been granted its own major-mode. The
practical difference is that the buffer is now read-only and has a
God-only knows how many times I've fruitlessly hit q while trying to quit the buffer, so the change is welcome.