# File lib/highline.rb, line 667
  def indent(increase=1, statement=nil, multiline=nil)
    @indent_level += increase
    multi = @multi_indent
    @multi_indent = multiline unless multiline.nil?
    if block_given?
        yield self
    else
        say(statement)
    end
    @multi_indent = multi
    @indent_level -= increase
  end