chromatic nailed it. Your problem is that though the
function that SUPER::do_something is being called in is
called from a function in package Bar, the code was
compiled in package Foo and so tries to access the SUPER
of the method from package Foo. (Similarly if you call
a function from a closure, your package and line number
as seen from
caller is the package and line number where
the code was when you created the closure.)
Therefore to do what you are trying you need to actually
compile it in the package that you want. So you can still
do what you want, but you need to use a string eval to
get it to work right.
For an example of the technique, complete with debugging
hooks so that errors are reported from something more
meaningful than just some eval, take a look at how I
implemented AbstractClass. (Look at the end of perlsyn
for an explanation of the #line business.)
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