CPAN is not ready for exception objects.

I modified the source of CPAN.pm by adding

                        use Data::Dumper; print STDERR Dumper($err);
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right before line 397.

This was the output:

$VAR1 = bless( {
                 'context' => '    />',
                 'message' => 'Specification mandates value for attrib
+ute crossorigin
',
                 'num2' => 5,
                 '_prev' => undef,
                 'code' => 41,
                 'str1' => 'crossorigin',
                 'level' => 3,
                 'str2' => undef,
                 'str3' => undef,
                 'file' => '',
                 'num1' => 0,
                 'domain' => 1,
                 'column' => 4,
                 '__prev_depth' => 0,
                 'line' => 14
               }, 'XML::LibXML::Error' );
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