I once used Aspect. I was trying to trace the double quotes operator (that's what's being called implicitly when using print). The following is an example. 
use strict;
use warnings;
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
use Aspect qw(advice calls returns around) ;
my $aspect = advice(
        calls(qr/^(Quantum|main)::(.*)/), 
          sub { printf "calling -> %s\n", $::thisjp->sub }
      );
$aspect->enable;
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
use Quantum::Entanglement;
sub foo {
    my $die = entangle( 1=>1, 1=>2, 1=>3, 1=>4, 1=>5, 1=>6 );
    print "$die" ;    # observed state
    print "\n" ;
}

foo();

__END__
calling -> main::foo
calling -> main::entangle
calling -> Quantum::Entanglement::_new
calling -> Quantum::Entanglement::(""
calling -> Quantum::Entanglement::_normalise
3
calling -> Quantum::Entanglement::DESTROY
calling -> Quantum::Entanglement::_rationalise_states
calling -> Quantum::Entanglement::_unravel

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In reply to Re: Clawing my way out of operator overloading hell by chunlou
in thread Clawing my way out of operator overloading hell by skyknight

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