http://www.perlmonks.org?node_id=545223


in reply to Perl Warning On dbmclose()

Errors and warnings are documented in perldiag.
untie attempted while %d inner references still exist
    (W untie) A copy of the object returned from tie (or tied) was still valid when untie was called.
If you undef $opnret before you call dbmclose, that warning should go away.

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