First, note that D::T on CPAN is version 0.10, and it dates back to 1999. I'd relax and take a deep breath before getting profane about something that beta and that old... :)

Well, ok, you seem to be getting profane about caller, not D::T. That brings us to:

Second, you've found a feature, not a bug. Your # line 2bug comment is acting like a #line directive in C or C++ would. I didn't know perl supports line directives, but that doesn't surprise me. In fact, this is documented in perlsyn, at least for my 5.6.1 installation. Look at the bottom of the file.
--
Mike