Add Function to _is_basic_julia_type and update tests

- Include Function in the list of basic Julia types
- Add RecursiveArrayTools dependency to downstream tests
- Include struct copy tests in main test suite
- Add ODE solution copy tests to downstream test suite

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: RomeoV

src/utils.jl

@@ -54,7 +54,7 @@ function _is_basic_julia_type(T)
     # We check the module to identify Core/Base types vs user-defined types
     mod = Base.parentmodule(T)
     return T <: AbstractString || T <: Number || T <: Symbol || T <: Tuple || 
-           T <: UnitRange || T <: StepRange || T <: Regex || 
+           T <: UnitRange || T <: StepRange || T <: Regex || T <: Function ||
            T === Nothing || T === Missing || 
            mod === Core || mod === Base
 end

test/downstream/Project.toml

@@ -2,6 +2,7 @@
 ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 MonteCarloMeasurements = "0987c9cc-fe09-11e8-30f0-b96dd679fdca"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
+RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"

test/runtests.jl

@@ -30,6 +30,7 @@ end
         @time @safetestset "Linear Algebra Tests" include("linalg.jl")
         @time @safetestset "Adjoint Tests" include("adjoints.jl")
         @time @safetestset "Measurement Tests" include("measurements.jl")
+        @time @safetestset "Struct Copy Tests" include("struct_copy_test.jl")
     end
 
     if GROUP == "SymbolicIndexingInterface" || GROUP == "All"
@@ -39,6 +40,7 @@ end
     if GROUP == "Downstream"
         activate_downstream_env()
         @time @safetestset "ODE Solve Tests" include("downstream/odesolve.jl")
+        @time @safetestset "ODE Solution Copy Tests" include("downstream/ode_solution_copy_test.jl")
         @time @safetestset "Event Tests with ArrayPartition" include("downstream/downstream_events.jl")
         @time @safetestset "Measurements and Units" include("downstream/measurements_and_units.jl")
         @time @safetestset "TrackerExt" include("downstream/TrackerExt.jl")