How to revert buffer from "Save file?" prompt?

[Sergey Organov]

Hello!

When I have a modified buffer and run, say "compile", emacs asks to:

Save file /home/osv/f/firm/make/defaults.make? (y, n, !, ., q, C-r, d or C-h)

and the set of choices doesn't seem to include "discard changes", or
"revert buffer" in emacs terminology.

What is the most convenient way to revert this particular buffer once
I'm there at this prompt?

Thanks,
-- Sergey Organov.