neovim/neovim — pull request #1747 by justinmk (2014-12-27 21:31:21+00:00)
Title: restore 'Not Implemented' for legacy script commands (:lua :ruby ...)

- restores behavior equivalent to Vim compiled without FEAT_MZSCHEME, etc.
(avoids spurious "E492: Not an editor command: EOF") for code such as:
```vim
if 0
perl << EOF
end
EOF
endif
```
- see `:help script-here`
- fixes #1308
- fixes https://github.com/junegunn/vim-plug/issues/111