GC is reclaiming live objects

[deadalnix]

I have made some research and found a workaround.

It seems that the problem is somehow related to map.array combination, 
but couldn't reproduce it on a simple test case.

Alex Rønne Petterson think to think that it is related to this bug 
http://d.puremagic.com/issues/show_bug.cgi?id=8774 (and it is possible, 
however hard to tell if it is really the case).

Replacing several map.array by foreach loops solved the issue. My best 
guess is that the frame pointer is passed in some way that the GC is not 
aware of.

What can I do now to help identifying the issue more precisely ?