Wrong closure values in the debugger

[Stas Boukarev]

(let ((a 1))
  (labels
    ((f1 ()
       (princ a)
       (incf a)
       (break))
     (f2 ()
       (f1)))
    (f2)))

Backtrace:
  0: ((LABELS F1))
      Locals:
        A = 70368591571592
  1: ((LABELS F2))
      Locals:
        A = 70368591571592
  2: ((LAMBDA ()))
      Locals:
        A = 2

Reported by flip214 on #sbcl

[Alastair Bridgewater (alastair-bridgewater)]

I haven't tried to replicate this, but it seems likely to me that the
closure value cell in question has been d-x allocated, and thus is stored
on the stack... And I don't recall ever looking into debugger interactions
with the d-x value cell changes.

Anyway, a possible starting point if someone wants to dig into this.

[Stas Boukarev (stassats)]

In 000a07de2a12437af30f28e75b39037b2bb6d63f