[R-pkg-devel] `Warning in formals(fun) : argument is not a function`

[Mark Clements]

I am looking for guidance on how to debug a CRAN warning for a package (rstpm2). The warning is:

`Warning in formals(fun) : argument is not a function`

I tried debugging this by using:

.onLoad <- function(libname, pkgname) {
    trace("formals", tracer = quote({
        cat(">>> formals called in R CMD check with object of class:", class(fun), "\n")
        print(sys.calls())
    }), print = FALSE)
}

At package installation, this showed that some formals() were called with objects of class derivedDefaultMethod -- however I am not certain _which_ objects cause this issue. (I realise that this suggests an issue with S3 versus S4 classes -- if that helps.) Does anyone have experience with debugging such warnings? Any guidance would be appreciated.

Sincerely, Mark.


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