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...s approach is that it should be fully compatible with functions that use the standard R functions for NSE and inspecting function context, like substitute(), match.call(), or parent.frame(). And indeed, it works! -- in R 4.3, that is. The prototype version of the package is here: https://github.com/mjskay/uneval (the relevant function to my question is probably do_invoke, in R/invoke.R). While testing on R-devel, I noticed that Rf_applyClosure(), which used to be exported, is now marked with attribute_hidden. I traced the change to this commit in Oct 2023: https://github.com/r-devel/r-svn/commit/5...