Hmm, so it's *not* a machine-specific problem after all [1,2] and can
now be reproduced on a regular R-devel build on Debian Sid. I'm sorry
for jumping to conclusions.
Why would Rcpp::loadModule() (called from rstan's .onLoad) end up trying
to apply a non-function, but only when being called from
broom.mixed/tests/testthat/test-alltibbles.R, and only on the first
attempt? (A repeated source() will run to completion without signalling
any errors.)
>> Error: package or namespace load failed for 'rstan' in
>> .doLoadActions(where, attach):
>> error in load action .__A__.1 for package rstan:
>> Rcpp::loadModule(module = "class_model_base", what = TRUE, env = ns,:
>> Unable to load module "class_model_base": attempt to apply
>> non-function
>> Error in .requirePackage(package) : unable to load required package
>> 'rstan'
The underlying error is in Rcpp::Module('class_model_base', mustStart =
TRUE, where = <namespace:rstan>):
>> simpleError in METHOD$info(""): attempt to apply non-function
This call originates in Rcpp:::method_wrapper:
Browse[3]> METHOD$info
NULL
Browse[3]> str(METHOD)
Prototypical reference class 'C++OverloadedMethods' [package "Rcpp"]
Browse[3]> unclass(METHOD) # print(METHOD) fails due do $info
<S4 Type Object>
attr(,".xData")
<environment: 0x5596b8ef1530>
Browse[3]> ls(METHOD@.xData, all = TRUE)
[1] ".->class_pointer" ".->const" ".->docstrings" ".->nargs"
[5] ".->pointer" ".->signatures" ".->size" ".->void"
[9] ".refClassDef" ".self" "class_pointer" "const"
[13] "docstrings" "nargs" "pointer" "signatures"
[17] "size" "void"
Why would an object of reference class 'C++OverloadedMethods' suddenly
lose its $info method? This doesn't look like anything printed when I
trace(Rcpp:::method_wrapper, quote(print(METHOD))) and then load
'rstan' in a fresh R session.
--
Best regards,
Ivan
[1]
https://cran.r-project.org/web/checks/check_results_broom.mixed.html
[2]
https://www.stats.ox.ac.uk/pub/bdr/donttest/broom.mixed.out
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