How would one do this (see below) with Moose? 
has 'x' => ( is => 'rw',
                  isa => 'str',
                  default => 'was once a ' );
has 'y' => ( is => 'rw',
                  isa => 'str',
                  default => $self->{x}.'y' );

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In reply to Moose Attribute Default Dependency by dpath2o

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