You only need to worry about memory if you have a circular reference (say a "parent" link). 
$tree = undef;

[download]
might be better. You'll get a warning later if you try to use it.

See WeakRef and Data::Structure::Util's has_circular_ref

In reply to Re: Deallocating HASH pointer by bsb
in thread Deallocating HASH pointer by Anonymous Monk

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