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#!/usr/local/bin/perl -w
use strict;
...
$BT->{'links'}[0]->makeLinks();
# I never get here because of memory issue
$BT->dumpPretty();

$ ./tieBoardTree.pl
Can't locate object method "TIESCALAR" via package "Tie::File" at
...
    
Uncaught exception from user code:
        Can't locate object method "TIESCALAR" via package "Tie::File"
+ at ./tieBoardTree.pl line 47.