RE: Reference found where even-sized list expected

[Ross, Jonathan C.]

> I get this warning:
> Reference found where even-sized list expected at ./n.pl line 94.
> 
> when running my script, and i don't understand what does it mean.
> Please explain. Here are the relevant lines:
> 
> 94:   my %args = {
> 95:       descriptor  =>      "/usr/lib/nitro/all.xml",
> 96:       build       =>      {
> 97:               cleanup     =>      1,
> 98:               bindir      =>      "$origwd/binaries"
> 99:       }
> 100:  };
> 

You've declared %args as a hash, so Perl expects the initializer to be
a list of key,value pairs:

        %h = (a => 1, b => 2);

        $x = $h{'a'};           # $x gets 1

Instead, you've provided a hash reference.  Perl sees that as a key in
the initializer list, and it wants the value (hence the "even-sized
list" error.)

References are scalar values, so use $args, not %args, e.g.

        $h = {a => 1, b => 2);

        $x = $h->{'a'};         # $x gets 1

Regards,
Jonathan