Thanks, @Jonah. I am able to get cmdstanr to work correctly on stan models on Catalina after removing the .Renviron that sets the path to clang7, which I think was created as part of the @coatless instructions for rstan. I also removed the .Makevars file, so rstan is just using the apple clang compiler, but that may not have been needed for cmdstanr anyway. So this looks like at least a great interim option.
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