How to debug the scheme/guile interpreter?

[Peter Teeson]

Greetings:

Mac Pro 4,1 - MacOS 10.7.5

I filed bug <http://bugs.gnu.org/13342> and Ludo' invited me to investigate which I've been doing, 

including reading the other bugs on this problem  http://bugs.gnu.org/10015,  http://bugs.gnu.org/10681.

My conclusion at this time, after a number of experiments, is that the issue is not in the llvm compiler but somewhere in the interpreter.

I am not familiar with the scheme or guile languages but have been a (now retired) developer on Mac for 25 years.

Before that 14 years on IBM mainframes as a systems programmer working on an APL interpreter.

I would like to try and track down this old issue but don't know how to debug the scheme/guile interpreter.

Looked in the guile manual but didn't find anything that helped me. 

Please give me some pointers on how to proceed.

TIA

Peter