Deprecation_analysis (stanc.Frontend.Deprecation

val expired : (int * int) -> bool

val deprecated_functions : (string * (int * int)) Core.String.Map.t

val rename_deprecated : 
  (string * (int * int)) Core.String.Map.t ->
  string ->
  string

val stan_lib_deprecations : (string * (int * int)) Core.String.Map.t

val collect_warnings : Ast.typed_program -> Warnings.t list

val remove_unneeded_forward_decls : Ast.typed_program -> Ast.typed_program

val set_jacobian_compatibility_mode : Ast.untyped_statement list -> unit

Pre-Stan 2.39, we need to know if _jacobian functions are FnPlain or not. We use the presence of any jacobian+= statements as our condition. If none are present, we assume this is old code.