Is there any reason that traverse can't take a reference to your variable, for instance...
#!perl -w
use strict;
my $var;
traverse($_, \$var) for @ARGV;
print $var;
sub traverse {
my($node, $var)= @_;
$$var .= $node . "\n";
traverse($node, $var) unless length $$var > 10;
# to show it work recursively
}
__END__
varref a b c d
a
a
a
a
a
a
b
c
d
(Sorry about the simplified traverse)
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