Thanks Dirk -- my apologies -- I see now that the subject line does kind of imply the toolchain. That was not my intention -- I think I was just trying to give people context -- the error happened in the context of an Rcpp-dependent app with the last useful message mentioning Rcpp, so I guess I thought that would help. I had no doubt that the problem was somewhere in my own code ;).
Good point on the "sophisticated" printf tech. I thought I was the only one who still used that. I have found, though, that VS Code can be super helpful once the debugger is wired correctly. In this case, I used Rcpp::rcout which worked well because I was running the devtools:test() in a remote R session.
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