fishmonger++ perl -d:Trace 01-libxml.t errored out after the line from the primary module

$self->_DESTROY

which I believe is a Moose addon. This seems like the biggest smoking gun.

I got no joy from Devel::Dumptrace. The first time I ran it in verbose mode it overran the memory on my 16G Ram machine. The second time I ran it in quiet mode and I couldn't tell if it locked up or was just grinding away with no output but after about a half an hour I quit.

Based on the last executed line from Devl::Trace as $self->_DESTROY I'm suspecting some trickiness that I tried where two instances are holding an attribute with a reference to each other. In fairness the simple case of this doesn't fail but I suspect that there probably is a really large "don't go there!" sign somewhere in the Moose documentation that I missed. I think I have some possible workarounds to try but I have reached the limit of root causing this based on available tools from the Monastery so I'm headed back to the architecture drawing board to poke at alternatives. It would have been nice if the tricky cross referencing had worked though.