class Sass::Selector::Sequence

def subjectless
  pre_subject = []
  has = []
  subject = nil
  members.each do |sseq_or_op|
    if subject
      has << sseq_or_op
    elsif sseq_or_op.is_a?(String) || !sseq_or_op.subject?
      pre_subject << sseq_or_op
    else
      subject = sseq_or_op.dup
      subject.members = sseq_or_op.members.dup
      subject.subject = false
      has = []
    end
  end
  return self unless subject
  unless has.empty?
    subject.members << Pseudo.new(:class, 'has', nil, CommaSequence.new([Sequence.new(has)]))
  end
  Sequence.new(pre_subject + [subject])
end