Difficulty compiling nimbleFunctions that depend on other nimbleFunctions in package structure.

[Scott Brown]

Encountering a problem with compiling nimbleFunctions that reference other nimbleFunctions in my package.

I've reduced this to a relatively minimal example:

nimNothing <- nimbleFunction(
  run = function(){
    returnType(double(0))
    return(0)
  })

#' @export
nestedNim <- nimbleFunction(
  run = function(){
    returnType(double(0))
    return(nimNothing())
  }
)

When I attempt to `compileNimble` the `nestedNim` nimbleFunction, specifically as part of an .Rmd vignette, I get errors.  When I load them via `devtools::load_all` it works fine.  To reproduce: put these two functions in an R file in a new package, create a vignette that compiles the `nestedNim` function, and call `devtools::build_rmd(...)` to build your vignette.  The specific error that I am getting with this is:

Error in if (typeEnv$return$type == "nimbleList" || code$args[[1]]$type == : missing value where TRUE/FALSE needed

But I suspect that this is something of a red herring, as I was getting an entirely different error before reducing this to a minimal example.  If you `devtools::load_all()` and then just "Run" the .Rmd file in RStudio, everything works.  Attached is a package with the described setup.

[Scott Brown]

If I #' @export the `nimNothing` function, then the .Rmd file compiles.  This is a satisfactory workaround for now, but it will become unfortunate as my package grows.

[Chris Paciorek]

Hi Scott, I've reproduced the problem by creating a minimal package, building and installing it and then trying `compileNimble(nestedNim)`.  If I don't export `nimNothing` then I get the error you showed:

```

Error in if (typeEnv$return$type == "nimbleList" || code$args[[1]]$type == : missing value where TRUE/FALSE needed

```

I'll put this on our list of issues to investigate.

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