REvalError when trying to access function arguments

[kskyten]

I'm trying to convert R code to Julia and ran into the following problem while trying to extract the arguments from a function expression:

julia> using RCall

julia> rparse("function(x){x + 2}")[1][2][1]
RObject{RCall.SymSxp}
Error showing value of type RObject{RCall.SymSxp}:
ERROR: REvalError: Error in function (x, digits = NULL, quote = TRUE, na.print = NULL, print.gap = NULL,  :
  argument "x" is missing, with no default

How do I extract the function argument x as a symbol?

[kskyten]

It seems function arguments are stored as pairlists. To get the names of the elements in R you can use names(args). Is there a way to call names from Julia on the pairlist object? It has type RObject{LangSxp}.

[kskyten]

It is just RCall.names(args).