>>>>> Laurent Gautier
>>>>> on Sun, 15 Sep 2019 15:01:09 -0400 writes:
> In case a search engine leads someone with the same issue
> here, I am documenting the point I reached:
> I can reproduce the issue with a small example when
> forcing R to not load any package at startup time (using
> an Renviron file): ``` package <- "utils" lib.loc <-
> "<fill this according to your R install>" ns <-
> loadNamespace(package, lib.loc) ```
> The code path goes through
> `registerS3methods(nsInfo$S3methods, package, env)` and
> there to:
> ``` if (methods::is(genfun, "genericFunction")) ```
> The evaluation of `methods::is` reaches the line
> triggering the error as `.identC(class1, class2)` and
> `.identC(class2, "ANY")` both return `NA` and `NA || NA`
> is not defined:
> ```
>> if (NA || NA) { cat("here\n") }
> Error in if (NA || NA) { : missing value where TRUE/FALSE
> needed ```
> As I understand it `.identC()` should never return `NA`,
that understanding is correct, it should return TRUE or FALSE,
nothing else.
> and if the case this would mean that R itself is an
> unstable state (something at the C level that should not
> have happened has happened) but this was not caught
> earlier.
yes.. something like that...
My current diagnosis would be that something in your embedding of R happened
in a way that "broke R entirely" ...
but note that I know almost nothing about embedding R.
Martin
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