From jmount at win-vector.com  Sat Mar 18 19:47:06 2017
From: jmount at win-vector.com (John Mount)
Date: Sat, 18 Mar 2017 11:47:06 -0700
Subject: [Rd] Red: RFC: (in-principle) native unquoting for standard
 evaluation
Message-ID: <536EF950-298A-4698-8DF5-E9288ECED877@win-vector.com>

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).

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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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[Rd] Red: RFC: (in-principle) native unquoting for standard evaluation
John Mount