class Sass::Selector::Sequence
def _sources(seq)
def _sources(seq) s = Set.new seq.map {|sseq_or_op| s.merge sseq_or_op.sources if sseq_or_op.is_a?(SimpleSequence)} s end
def _sources(seq) s = Set.new seq.map {|sseq_or_op| s.merge sseq_or_op.sources if sseq_or_op.is_a?(SimpleSequence)} s end