In tm version 0.7-1, there was a readTabular() function. Now it is gone, and if you try to use it, there is no deprecation message or warning or a
tm
readTabular()
Per "news for package tm" on CRAN (https://cran.r-project.org/web/packages/tm/news.html):
readTabular() has been removed. Use DataframeSource instead.