I have improved this script a bit, it can recurse into symbol tables now.
I learned something new today. Internals::SvREADONLY can reset the readonly flag :)

my $table=shift||'';
$table.="::";

dumptable($table);

sub dumptable{
my $table=shift;
my $indent=shift||'';
while (my ($key,$value)=each %$table ){
    print qq!$indent"$key":\n!;
    if(defined(*{$value}{SCALAR}) and defined(${ *{$value}{SCALAR}})){
        print "$indent\tSCALAR: ",${*{$value}{SCALAR}}, "\n";
    }
    if(defined( *{$value}{ARRAY} ) ) {
        print "$indent\tARRAY: ", join ", ",@{*{$value}{ARRAY}}, "\n";
    }
    if(defined( *{$value}{HASH}  ) ) {
        if ($key =~ /::$/){
            print "$indent\tSYMTAB:\n";
            dumptable($value,"\t".$indent)
                if (*{$value}{NAME} ne "main::");
        }else{
            print "\tHASH:\n";
            while(my ($k, $v) = each %{ *{$value}{HASH} } ) {
                print "$indent\t\t$k => $v,\n"
            }
        }
    }
    if(defined( *{$value}{CODE}  ) ) {
        print "$indent\tCODE: ",*{$value}{CODE},"\n";
    };
    if(defined( *{$value}{IO}  ) ) {
        print "$indent\tIO: ",*{$value}{IO},"\n";
    };
    print "\n"
}
}
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