^^ What Dave said, plus the added problem that you lexically (in this case file) scoped $thing with my. You'll want to use 'our' to accomplish what you're trying to do there, which is accessing it from code in a different file. 'our' will allow you to do that, my will not. Both will pass strict. I normally recommend my'ing everything possible, and use methods to access it. Then you're really in control, but slower.
my $thing = "thing";
Changes to:
our $thing = "thing";
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