Fix #582: Use primarycensored dependency resolution for Stan function loading (#593)

Co-authored-by: Sam Abbott <contact@samabbott.co.uk>

Author: seabbs-bot

NEWS.md

@@ -8,6 +8,13 @@
 - Added `primarycensored (>= 1.4.0)` version bound to DESCRIPTION.
 - Updated test expectations for changed primarycensored error handling.
 
+## Package
+
+- Load only required primarycensored Stan functions
+  (`primarycensored_lpmf` and ODE/distribution helpers) with
+  `pcd_load_stan_functions(dependencies = TRUE)` instead of loading all
+  functions. See #582.
+
 ## CI
 
 - Extended `check-cmdstan` workflow to also check marginal model Stan syntax.

R/marginal_model.R

@@ -374,7 +374,15 @@ epidist_stancode.epidist_marginal_model <- function(
 
   pcd_stanvars_functions <- brms::stanvar(
     block = "functions",
-    scode = primarycensored::pcd_load_stan_functions()
+    scode = primarycensored::pcd_load_stan_functions(
+      c(
+        "primarycensored_lpmf",
+        "primarycensored_ode",
+        "dist_lcdf",
+        "primary_lpdf"
+      ),
+      dependencies = TRUE
+    )
   )
 
   stanvars_all <- stanvars_version +