railties/lib/rails/generators/rails/controller/templates/controller.rb.tt

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<% module_namespacing do -%>
class <%= class_name %>Controller < <%= parent_class_name.classify %>
<% actions.each do |action| -%>
  def <%= action %>
  end
<%= "\n" unless action == actions.last -%>
<% end -%>
end
<% end -%>