SCM_DEBUG_FREELIST

[Dirk Herrmann <dirk at ida dot ing dot tu-bs dot de>]

Hello!

I am about to do some mindless work.  This time, I'd like to rename the
debugging macros according to the SCM_DEBUG_ naming scheme.  Thus, I have
some questions about GUILE_DEBUG_FREELIST:

* If this macro is enabled, with every new cell the list of free cells is
  checked whether it contains cells that are not of the free-cell type.
  Is this right, or is there anything else about this macro which I am
  missing?
* What are the errors that are supposed to be found with this debugging
  option?  I. e. in which way may it help developers of guile or
  extensions to guile?  To me it seems that it can mostly be used to
  detect heap corruption, maybe also to find errors in the garbage
  collector.  Or is there more to it?

Best regards
Dirk