class ActionDispatch::ShowExceptions

def initialize(app, exceptions_app = nil)
  if [true, false].include?(exceptions_app)
    ActiveSupport::Deprecation.warn "Passing consider_all_requests_local option to ActionDispatch::ShowExceptions middleware no longer works"
    exceptions_app = nil
  end
  if exceptions_app.nil?
    raise ArgumentError, "You need to pass an exceptions_app when initializing ActionDispatch::ShowExceptions. " \
      "In case you want to render pages from a public path, you can use ActionDispatch::PublicExceptions.new('path/to/public')"
  end
  @app = app
  @exceptions_app = exceptions_app
end