I'm honored. I agree that it's not a good idea to code using fragile features. In this case, I can't get my updated test case to break whereever I place my 'use subs' statement. I'm curious, because I expect use subs to be part of the extremely beaten-on core of the core of perl. I'm also curious, because I've found such suprising behavior in my bugs that I wondered if it might be worth exploring them more, rather than just fixing or working around them and moving on.
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