I’m migrating this from a StackOverflow discussion , because I think it will be easier to have a discussion of what’s happening here. The issue is a package that has compiled code from both representations of Stan models and Rcpp functions. A minimally reproducible example can be found in my rcppstan …

Compiled code from Stan and Rcpp

bgoodri June 5, 2018, 6:16pm 7

It is possible that you can take the module loading line out of .onLoad() in zzz.R and not load it until right before you call rstan::sampling.

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