code: function message(violation, suggestion, condition, joiner) {
    var reason =
      join(quotation(violation, '`'), joiner) +
      ' may be insensitive' +
      (condition ? ', ' + condition : '') +
      ', '
  
    if (suggestion) {
      reason += 'use ' + join(quotation(suggestion, '`'), joiner) + ' instead'
    } else {
      reason += 'try not to use it'
    }
  
    return reason
  }
docs: /* Create a human readable warning message for `violation`
  and suggest `suggestion`.