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  1. or download this
    BEGIN {
        my $static_val = 0;
    ...
        state $static_val = 0;
        return ++$static_val;
    }
    
  2. or download this
    $ perl -e 'my $x if 0'
    Deprecated use of my() in false conditional. This will be a fatal erro
    +r in Perl 5.30 at -e line 1.