R Under development (unstable) (2023-10-16 r85339 ucrt) -- "Unsuffered Consequences"
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> #Sys.setenv("R_TESTS" = "")
> #library(rstan)
> #stancode <- 'data {real y_mean;} parameters {real y;} model {y ~ normal(y_mean,1);}'
> #mod <- stan_model(model_code = stancode, verbose = TRUE)
> #fit <- sampling(mod, data = list(y_mean = 0))
>   
> 
> proc.time()
   user  system elapsed 
   0.10    0.04    0.14