This file is indexed.

/usr/share/perl5/perl5i/2/Signature/None.pm is in libperl5i-perl 2.8.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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package perl5i::2::Signature::None;

use strict;
use warnings;

use overload
  q[""] => sub { return $_[0]->as_string },
  q[bool] => sub { 1 },  # always true, regardless of the actual signature string
  fallback => 1
;

sub new {
    my $class = shift;
    my %args = @_;
    return bless { signature => $args{signature} }, $class;
}

sub num_positional_params { 0 }
sub positional_params { return []; }
sub params { return []; }
sub make_real {}

sub as_string {
    my $self = shift;
    return $self->{signature};
}

1;