RE: compilation-next-error - extra `let' binding?

[Drew Adams]

It also looks like the test in the second branch of this `if' could be just
(> n 0), for clarity:

(if (zerop n)
    (unless ...)
  (setq last (nth 2 (car msg)))
  (if (>= n 0) ; <== Can't be zero here, anyway.
      (compilation-loop ...)
        ...))