Why do you have a role and and a base class? You should use a role instead of a base class. All you need is

package Widget::Role;            # Formerly Widget::Abstract
use Moose::Role;
requires qw( get_widget_type );  # Abstract methods
...                              # Other attributes and methods.
1;
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package Widget::Snazzy;
use Moose;
with qw( Widget::Role );
sub get_widget_type { __PACKAGE__ }
...
1;
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