in reply to I'd like to have an indication when the interpreter moves to the next file (using Filter-Include)?

How 'bout playing with code in @INC? See require.

E.g. something like:

#!/usr/bin/perl use strict; use warnings; use lib sub { warn "Attempt to load `$_[1]'"; undef }; use File::Find; __END__
which gives me
$ perl foo.pl Attempt to load `File/Find.pm' at foo.pl line 5. Attempt to load `warnings/register.pm' at foo.pl line 5. Attempt to load `Cwd.pm' at foo.pl line 5. Attempt to load `vars.pm' at foo.pl line 5. Attempt to load `XSLoader.pm' at foo.pl line 5. Attempt to load `File/Basename.pm' at foo.pl line 5. Attempt to load `re.pm' at foo.pl line 5. Attempt to load `File/Spec.pm' at foo.pl line 5. Attempt to load `File/Spec/Unix.pm' at foo.pl line 5. Attempt to load `Scalar/Util.pm' at foo.pl line 5. Attempt to load `List/Util.pm' at foo.pl line 5. Attempt to load `DynaLoader.pm' at foo.pl line 5. Attempt to load `AutoLoader.pm' at foo.pl line 5.
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