---
<filename>:
  <subname>:
    called from: <filename>:<subname>: <this many times>

##</code><code>##

# file Classone.pm
package Classone;
sub new { }
1;

# file Classtwo.pm
package Classtwo;
sub new { }
sub a_method {
    Classone->new;
    Classtwo->new;
}
1;

##</code><code>##

Classone.pm:
  new:
    Classtwo.pm:a_method: 2
Classtwo.pm:
  a_method: {}

  new:
    Classtwo.pm:a_method: 2