span class='id identifier rubyid_feasibility_action'>feasibility_action</span> <span class='op'>||=</span> <span class='id identifier rubyid_button_defaults'>button_defaults</span><span class='lbracket'>[</span><span class='symbol'>:feasibility_action</span><span class='rbracket'>]</span> <span class='op'>||</span> <span class='id identifier rubyid_comp_name_or_cst_or_class'>comp_name_or_cst_or_class</span><span class='period'>.</span><span class='id identifier rubyid_to_s'>to_s</span><span class='period'>.