def seq_contains_sel_class?(seq, selector_class)
      seq.members.any? do |simple|
        simple.is_a?(selector_class)
      end
    end
def seq_contains_sel_class?(seq, selector_class)
      seq.members.any? do |simple|
        simple.is_a?(selector_class)
      end
    end
Checks if a simple sequence contains a
 simple selector of a certain class.

 @param seq [Sass::Selector::SimpleSequence]
 @param selector_class [Sass::Selector::Simple]
 @returns [Boolean]