#!/bin/perl
use GDBM_File;

# File 'voo' created with:
#tie %DBM, GDBM_File, 'voo', &GDBM_WRCREAT, 0644;
#$DBM{'goo'}='moo';
#untie %DBM;

sub DBMopenread {
    $DBREFread=tie %DBM, GDBM_File, $_[0], &GDBM_READER, 0644;
}
sub DBMcloseread {
    $DBREFread = undef; untie %DBM;
}

&DBMopenread('voo');
#$DBREFread=tie %DBM, GDBM_File, 'voo', &GDBM_READER, 0644;
$m=$DBM{'goo'};
print "$m\n";
&DBMcloseread("voo");

##</code><code>##

Argument "voo" isn't numeric in subroutine entry at /opt/perl/lib/5.6.1/sun4-solaris/GDBM_File.pm line 69.