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  1. or download this
    $ perl -MData::Dump  -E '$fs4={_structure=>{"/Users/dotfiles/perl5/my_
    +modules"=>{}}};my $b= $fs4->{_structure}{"/Users/dotfiles/perl5/my_mo
    +dules"};say (exists $b->{BLAH} and exists $b->{BLAH}{crap}); say dd( 
    +$fs4)'
    
  2. or download this
    { _structure => { "/Users/dotfiles/perl5/my_modules" => {} } }
    1