R CMD check issue with use of nClass member variables in nClass functions

[paciorek]

If I have this basic nClass code in a function in a "user" package, R CMD check complains that Rv and Cv can't be found as global variables.

Nothing we need to deal with now probably. Just flagging this for future consideration.

myfun <- function(x, v=7) {
    nc <- nClass(
        Rpublic = list(
            Rv = NULL,
            Rfoo = function(x) x+Rv
        ),
        Cpublic = list(
            Cv = 'numericScalar',
            Ca = 'numericVector',
            Cfoo = nFunction(
                fun = function(x) {
                    return(x+Cv)
          },
          argTypes = list(x = 'numericScalar'),
          returnType = 'numericScalar')
        )
    )
    Robj <- nc$new()
    Cnc <- nCompile(nc)
    Cobj <- Cnc$new()
    Cobj$Cv <- v

    Cobj2 <- Cnc$new()
    Cobj2$Cv <- v+1

    return(c(Cobj$Cfoo(x), Cobj2$Cfoo(x)))
}

* checking R code for possible problems ... NOTE
myfun : <anonymous>: no visible binding for global variable ‘Rv’
myfun : <anonymous>: no visible binding for global variable ‘Cv’
Undefined global functions or variables:
  Cv Rv