Ah, you just showed me something cool, that I can do without the 'sub' declaration if I prototype the callback-setter.

But I guess I'm not being very clear as to my primary objective. I would like to have something like the following:

package MyModule;

my $callback;

sub set_callback {
  $callback = shift;
}

sub exec_callback {
  # the next three lines don't work, but they are indicative of what I
+ would like
  # to see happen... i want $name, $street, $city, $zip to be made ava
+ilable as package
  # globals to the anonymous callback sub... in other words, I don't w
+ant the callback
  # to execute in it's own package, I want it to execute in MyModule::
+ThrowAway
  package MyModule::ThrowAway;
  our ($name, $street, $city, $zip) = @_;
  &$callback();
  package MyModule
}

package main;

# set callback to check that name and zip are both correctly formatted
# notice that callback sub assumes that $name and $zip have been set f
+or it, not
# passed in @_
#
MyModule::set_callback(sub { $name =~ /^[a-zA-Z\s]+$/ and $zip /^\d+$/
+ })

MyModule::exec_callback('Bob', '600 1st St.', 'Beverly Hills', 90210);
[download]

Now that I think about it, this could never work under use strict, since $name and $zip are undeclared at the time the callback sub is formed.

update: cleared up a few confusing things in my code

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