I only encountered this because I used a script to use subs for all subs, to be able to begin to get rid of parentheses for non-object subs.
As you've seen, that's a bad idea. If you're rigorous about the order in which Perl compiles your code, you can get away with it... but I like to avoid code which relies on a well-defined order of appearance in the compilation process, as it seems fragile.
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