Foo.pm is:
package Foo;
use Filter::Macro;
use Carp;
and the other file is:
use Foo;
confess "Yes";
Now, the first time through, the confess happens. Subsequently, the file
is totally silent.
| Subject: | Foo.pm |
package Foo;
use Filter::Macro;
use Carp;
| Subject: | delete_me.pl |
use Foo;
confess "Yes";