def builder(ex: ErrorDeserializingProgramOutput): TagMod = {
    div(Styles.danger, key := ex.toString.hashCode,
      ex.eliminate(renderDeserializationError,
        _.eliminate(renderQQRuntimeException,
          _.eliminate(renderQQCompilerException,
            _.eliminate(renderParsingException,
              _.eliminate(renderBase64Exception,
                _.eliminate(renderBytecodeException,
                  _.impossible)))))))
  }

  def renderDeserializationError(err: Invalid.Data): TagMod = {
    "Error deserializing output from QQ program: " + err
  }

  def renderBytecodeException(err: InvalidBytecode): TagMod = {
    "Error getting QQ program from cache (bytecode): TagMod: " + err
  }

  def renderBase64Exception(err: InvalidBase64): TagMod = {
    "Error getting QQ program from cache (base64): " + err
  }

  def renderParsingException(err: ParseError): TagMod = {
    "Error parsing QQ program: " + err
  }

  def renderQQCompilerException(err: QQCompilationException): TagMod = {
    "Error compiling QQ program: " + err
  }

  def renderQQRuntimeException(err: QQRuntimeException): TagMod = {
    "Error running QQ program: " + err
  }