Help needed for a simple static sum

Specific Domains Modelling & Simulations
5

Thanks for the help !

Indeed there is no error if I supress the output in the REPL with a ;. However, if I try to simplify the system including a semicolon:

using ModelingToolkit

@variables t

@connector function PipeNode(; name)
    states = @variables Ṁ(t) = 1.0 [connect = Flow]
    ODESystem(Equation[], t, states, []; name = name)
end

@component function Source(; name, feed = 1.0)
    @named outlet = PipeNode()
    params = @parameters feed = feed
    eqs = [
        outlet.Ṁ ~ feed
    ]
    compose(ODESystem(eqs, t, [], params; name = name), outlet)
end

@component function Sink(; name, product = 1.0)
    @named inlet = PipeNode()
    params = @parameters product = product
    eqs = [
        product ~ inlet.Ṁ
    ]
    compose(ODESystem(eqs, t, [], params; name = name), inlet)
end

@component function Silo(; name)
    @named inlet1 = PipeNode()
    @named inlet2 = PipeNode()
    @named outlet = PipeNode()
    eqs = [
        outlet.Ṁ ~ inlet1.Ṁ + inlet2.Ṁ
    ]
    compose(ODESystem(eqs, t, [], []; name = name), inlet1, inlet2, outlet)
end

@named silo = Silo()

@named feed_circuit = Source()
@named feed_screen  = Source()
@named prod_circuit = Sink()


circuit_eqs = [
    connect(feed_circuit.outlet, silo.inlet1)
    connect(feed_screen.outlet, silo.inlet2)
    connect(silo.outlet, prod_circuit.inlet)
]

@named _circuit_model = ODESystem(circuit_eqs, t);

@named circuit_model = compose(_circuit_model,
                          [silo, feed_circuit, feed_screen, prod_circuit]);

sys = structural_simplify(circuit_model);

I get a similar error:

ERROR: UndefVarError: `name` not defined
Stacktrace:
  [1] connection2set!(connectionsets::Vector{ModelingToolkit.ConnectionSet}, namespace::Nothing, ss::Tuple{ODESystem, ODESystem}, isouter::ModelingToolkit.var"#isouter#221"{Vector{Symbol}})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:195
  [2] generate_connection_set!(connectionsets::Vector{ModelingToolkit.ConnectionSet}, sys::ODESystem, find::Nothing, replace::Nothing, namespace::Nothing)
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:312
  [3] generate_connection_set!
    @ ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:273 [inlined]
  [4] generate_connection_set
    @ ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:263 [inlined]
  [5] expand_connections(sys::ODESystem, find::Nothing, replace::Nothing; debug::Bool, tol::Float64)
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:512
  [6] expand_connections (repeats 2 times)
    @ ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/connectors.jl:510 [inlined]
  [7] structural_simplify(sys::ODESystem, io::Nothing; simplify::Bool, kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/systems.jl:21
  [8] structural_simplify
    @ ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/systems.jl:19 [inlined]
  [9] structural_simplify(sys::ODESystem)
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/MDLZQ/src/systems/systems.jl:19
 [10] top-level scope
    @ ~/Documents/Code/SimHPGR/src/mdltk_silo.jl:60

Any idea why ? Acausal compopnent-based modeling is not easy.

Francis