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diff --git a/lib/Lintian/Index/Ar.pm b/lib/Lintian/Index/Ar.pm
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+# -*- perl -*- Lintian::Index::Ar
+#
+# Copyright (C) 2020 Felix Lechner
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package Lintian::Index::Ar;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+use Cwd;
+use Path::Tiny;
+use Unicode::UTF8 qw(decode_utf8 encode_utf8);
+
+use Lintian::IPC::Run3 qw(safe_qx);
+
+use Moo::Role;
+use namespace::clean;
+
+const my $EMPTY => q{};
+const my $NEWLINE => qq{\n};
+
+=head1 NAME
+
+Lintian::Index::Ar - binary symbol information.
+
+=head1 SYNOPSIS
+
+    use Lintian::Index;
+
+=head1 DESCRIPTION
+
+Lintian::Index::Ar binary symbol information.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item add_ar
+
+=cut
+
+sub add_ar {
+    my ($self) = @_;
+
+    my $savedir = getcwd;
+    chdir($self->basedir)
+      or die encode_utf8(
+        $self->identifier . ': Cannot change to directory ' . $self->basedir);
+
+    my $errors = $EMPTY;
+
+    my @archives
+      = grep { $_->name =~ / [.]a $/msx && $_->is_regular_file }
+      @{$self->sorted_list};
+
+    for my $archive (@archives) {
+
+        # skip empty archives to avoid ar error message; happens in tests
+        next
+          unless $archive->size;
+
+        my %ar_info;
+
+    # fails silently for non-ar files (#934899); probably creates empty entries
+        my $bytes = safe_qx(qw{ar t}, $archive);
+        if ($?) {
+            $errors .= "ar failed for $archive" . $NEWLINE;
+            next;
+        }
+
+        my $output = decode_utf8($bytes);
+        my @members = split(/\n/, $output);
+
+        my $count = 1;
+        for my $member (@members) {
+
+            # more info could be added with -v above
+            $ar_info{$count}{name} = $member;
+
+        } continue {
+            $count++;
+        }
+
+        $archive->ar_info(\%ar_info);
+    }
+
+    chdir($savedir)
+      or die encode_utf8(
+        $self->identifier . ": Cannot change to directory $savedir");
+
+    return $errors;
+}
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for
+Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et