neovim/neovim — pull request #1282 by splinterofchaos (2014-10-11 02:11:07+00:00)
Title: [RFC] vim-patch:7.4.414 + vim-patch:7.4.415

> Problem: Cannot define a command only when it's used.

> Solution: Add the CmdUndefined autocommand event. (partly by Yasuhiro Matsumoto)

That's 414--415 is a fixup. Also reformatted `fileio.c`'s diagram, which looks wrong if `tabstop` isn't 4.