# File lib/unified_ruby.rb, line 221
  def rewrite_masgn(exp)
    raise "wtf: #{exp}" unless exp.size == 4 # TODO: remove 2009-01-29
    t, lhs, lhs_splat, rhs = exp

    lhs ||= s(:array)

    if lhs_splat then
      case lhs_splat.first
      when :array then
        lhs_splat = lhs_splat.last if lhs_splat.last.first == :splat
      when :splat then
        # do nothing
      else
        lhs_splat = s(:splat, lhs_splat)
      end
      lhs << lhs_splat
    end

    s(t, lhs, rhs).compact
  end