The most likely cause for circular references are bad entries in the
grafts file (like I did once); since basically noone tells you where you
went wrong, it can be a bit puzzling to find out that part of your tree
goes dark sometimes, depending on which tool/options you pick to walk the
commit-tree.
-- 
Sincerely,                                                          srb@cuci.nl
           Stephen R. van den Berg (AKA BuGless).
"God gave us a penis and a brain but not enough blood
 to use both at the same time." -- Robin Williams
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