expose_stan_functions errors

[spinkney]

I keep getting the error

Compiling standalone functions...
Error in 1:struct_start : argument of length 0

Tested on

    real test (real x) {
      return x + 5;
    }

Session info

R version 4.2.3 (2023-03-15)
Platform: aarch64-apple-darwin20 (64-bit)
Running under: macOS Ventura 13.3.1

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] cmdstanr_0.5.3 copula_1.1-0  

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.10             ADGofTest_0.3           mvtnorm_1.1-3           lattice_0.20-45         prettyunits_1.1.1      
 [6] ps_1.7.1                utf8_1.2.2              V8_4.2.0                R6_2.5.1                backports_1.4.1        
[11] stats4_4.2.3            pcaPP_2.0-2             ggplot2_3.4.0           pillar_1.7.0            rlang_1.0.6            
[16] curl_4.3.2              rstudioapi_0.13         data.table_1.14.6       callr_3.7.1             Matrix_1.5-3           
[21] checkmate_2.1.0         RcppEigen_0.3.3.9.2     loo_2.5.1               munsell_0.5.0           compiler_4.2.3         
[26] numDeriv_2016.8-1.1     xfun_0.31               rstan_2.30.1.9000       pkgconfig_2.0.3         gsl_2.1-7.1            
[31] pkgbuild_1.3.1          tidyselect_1.2.0        tibble_3.1.7            tensorA_0.36.2          gridExtra_2.3          
[36] codetools_0.2-19        matrixStats_0.62.0      stabledist_0.7-1        fansi_1.0.3             pspline_1.0-19         
[41] crayon_1.5.1            dplyr_1.1.0             withr_2.5.0             grid_4.2.3              distributional_0.3.0   
[46] jsonlite_1.8.0          gtable_0.3.0            lifecycle_1.0.3         DBI_1.1.3               magrittr_2.0.3         
[51] posterior_1.3.1         StanHeaders_2.30.1.9000 scales_1.2.0            RcppParallel_5.1.5      cli_3.6.0              
[56] farver_2.1.1            decor_1.0.1             ellipsis_0.3.2          generics_0.1.3          vctrs_0.5.2            
[61] tools_4.2.3             glue_1.6.2              processx_3.7.0          abind_1.4-5             parallel_4.2.3         
[66] inline_0.3.19           colorspace_2.0-3        knitr_1.39     

[andrjohns]

Resolved by #769