IO::Callback to the rescue! (It's a module so cool, I couldn't stand to see it languishing unmaintained on CPAN, so I took over maintenance.)
use IO::Callback;
# Here's the coderef
my $code = sub {
my $str = shift;
print STDERR "This is really bad: $str";
};
# Turn it into a filehandle opened in write mode
my $fh = IO::Callback->new('>', $code);
# Select that filehandle (makes it the default for print, say, etc).
select($fh);
# Print something - it gets passed to the coderef!
print "Hello World\n";
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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