Plan 9's Acme doesn't support multiline (at least not version I have).

The way you can do it is to put the multiline instructions for Edit in a different buffer; then select the multiline instructions and middle-left click on Edit of the file you want to edit.

On Mon, Oct 27, 2014 at 10:09 AM, Rob Pike <robpike@gmail.com> wrote:

Yes you can. That's how I verified this works. Open up the tag to
multiple lines (just type newline in the tag).

-rob