# File lib/grape/dsl/parameters.rb, line 202
      def given(*attrs, &block)
        attrs.each do |attr|
          proxy_attr = first_hash_key_or_param(attr)
          raise Grape::Exceptions::UnknownParameter.new(proxy_attr) unless declared_param?(proxy_attr)
        end
        new_lateral_scope(dependent_on: attrs, &block)
      end