# File lib/sass/tree/visitors/convert.rb, line 130
  def visit_if(node)
    name =
      if !@is_else; "if"
      elsif node.expr; "else if"
      else; "else"
      end
    str = "#{tab_str}@#{name}"
    str << " #{node.expr.to_sass(@options)}" if node.expr
    str << yield
    @is_else = true
    str << visit(node.else) if node.else
    str
  ensure
    @is_else = false
  end