R devel - Mar 2017 - Red: RFC: (in-principle) native unquoting for standard evaluation

Obviously we have to be sensitive about language and parser changes.  However, I
think Jonathan Carroll has identified a feature that is well understood in the
Lisp world (quoting and unquoting) that is missing from the R language.  Some
symbol that indirects to a value (only once!, we don?t want this chaining; and
there are issues of quoting it out) in eval would be very valuable.  Obviously
it is most useful where non-standard evaluation is emphasized (plotting,
formulas, and dplyr being the examples that I can immediately think of).

---------------
John Mount
http://www.win-vector.com/ <http://www.win-vector.com/> 
Our book: Practical Data Science with R
https://www.manning.com/books/practical-data-science-with-r
<https://www.manning.com/books/practical-data-science-with-r>




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