I mess with buffering of both STDERR and STDOUT. I ensure that they are not buffered when Developing or Debugging code. I believe it is the case that STDERR may not be buffered in perl5, but I'd have to verify that to be sure. It's old template code.
As for Carp, it's scope is limited to the conditional block. The fact that it is usually loaded is not really that important, as I don't know of any code that includes this template header, that I've removed the 'Devel=1' status on. :-)
I'm aware that the if around the 'use' doesn't provide conditional compilation, if that was your point.
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