Hello, I'm attaching a patch that clean up a bit of non conventional coding practices (mainly because of my ignorance), in ob-R. These were initially generating warning during the compilation of org-mode. The main feature is the use of the defvaralias ess-eval-visibly-p when the :result output in async evaluation. With this change make does not generate any warning for ob-R.el and all the test of ob-R.el passes, so no significant change for the user. Best regards, Jeremie