actionpack/lib/action_dispatch/middleware/templates/rescues/_actions.html.erb

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<% actions = exception_wrapper.actions %>

<% if actions.any? %>
  <div class="actions">
    <% actions.each do |action, _| %>
      <%= button_to action, ActionDispatch::ActionableExceptions.endpoint, params: {
        error: exception_wrapper.exception_class_name,
        action: action,
        location: request.path
      } %>
    <% end %>
  </div>
<% end %>