# File lib/less/errors.rb, line 5
    def initialize(cause, value = nil)
      @value = value
      message = nil
      if @value # 2 args passed
        message = @value['message']
      else # allow passing only value as first arg cause :
        if cause.respond_to?('[]''[]') && message = cause['message']
          @value = cause
        end
      end
      
      if cause.is_a?(::Exception)
        @cause = cause
        super(message || cause.message)
      else
        super(message || cause)
      end
    end