Please read this article and try to understand the difference between a shallow copy and a deep copy. Once you understand that you will understand why it didn't make a difference when you tried to pass the structure by value or reference. But it would make a difference if you copied it with Storable's dclone.

I obviously couldn't tell you why the code changed the tree. I've already indicated that I wouldn't worry about it too much, I would rewrite the code in question.

In reply to Re^3: Tree::Nary -- my program is creating phantom nodes by tilly
in thread Tree::Nary -- my program is creating phantom nodes by Amphiaraus

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