Missing reference and memory leak

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$ perl t/DaemonHeavyLeak.t
ListParser is gone
...
referenced by REF(0x2e7a768) [refcount 1], which is
      not found anywhere I looked :(
FSA::Rules is dead

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use warnings;
use strict;
...

syswrite STDOUT,  "End of program\n";

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sub DESTROY { 

...
        syswrite STDOUT, "FSA::Rules is dead\n"
        
        }

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+- referenced by REF(0x2e7a768) [refcount 1], which is
|     not found anywhere I looked :(

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