I would say that if you have a module explicitly calling functions in the main package, your module is not modular at all! If the "global" function is needed everywhere, it should be in a separate module, importable by the other modules. Or if a module needs another package (let's say the main package) to provide it with a function, perhaps it would be cleaner if main sent a reference instead:
package main;
Bar::bar(\&foo);
sub foo {
# do stuff
}
package Bar;
sub bar {
# need to call a subroutine provided by the caller
my $subref = shift;
$subref->();
}
The only uses I have had for &sub are to generate subroutine references and to override subroutine prototypes.
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