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#! /usr/bin/perl
use warnings; use strict;
...

$template->param(foo => \@array);
$template->output;

$VAR1 = [
          {
...
          }
        ];
HTML::Template->output() : fatal error in loop output : Not a HASH ref
+erence at /usr/share/perl5/HTML/Template.pm line 3059.

#! /usr/bin/perl
use warnings; use strict;
...
    $template->param(foo => $array_ref);
}
print $template->output;