Identation of ":else" in nested conditionals in the loop macro looks wrong.

[borderite]

My understanding is that when conditionals are nested in the loop macro expression, :else corresponds to the last conditional (:if or :when). If this is the case, the indentation level of :else should be the same as that of the last conditional. For example. I expect sometin like:

(let ((str "a2c4d3e5"))
  (print
   (loop :for x across str
	 :when (digit-char-p x)
	     :if (= (rem (digit-char-p x) 3) 0)
	        :collect x
	     :else
	        :collect #\z)))

But what I actualy get under SLIME 2.27 is:

(let ((str "a2c4d3e5"))
  (print
   (loop :for x across str
	 :when (digit-char-p x)
	     :if (= (rem (digit-char-p x) 3) 0)
	        :collect x
	 :else
	     :collect #\z)))

That is, :end is aligned with the outer conditional. It would be wonderful if you could fix this behavior.