Parse {|r(Arg,...||R-code|} into a the expression below. This
expression may be passed to <-/2 and <-/1 as well as used
directly as a goal, calling r_execute/3.
r_execute(Assignments, Command, Result)
- See also
 - - https://cran.r-project.org/doc/manuals/r-release/R-lang.html#Parser
 
- To be done
 - - Verify more of the R syntax.