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$ 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)'
{ _structure => { "/Users/dotfiles/perl5/my_modules" => {} } } 1