`mk_init_singleton` failed when using default constructors to initialize non-trivial fields

[thautwarm]

MWE:

using ObjectOriented

@oodef struct WebSocketClient1
    url::String
    running:: Ref{Bool}
end

@oodef mutable struct ClientConnect1
    client::WebSocketClient1

    function startConnect1(self,url)
        running = Ref{Bool}(true)
        self.client = WebSocketClient1(url,running)
    end
end


client = ClientConnect1()
client.startConnect1("aaaaa")

Exception:

ERROR: LoadError: ArgumentError: type does not have a definite number of fields
Stacktrace:
  [1] fieldcount(t::Any)
    @ Base .\reflection.jl:814
  [2] fieldtypes(T::Type)
    @ Base .\reflection.jl:841
  [3] mk_init_singleton(t::Any)
    @ ObjectOriented.RunTime C:\Users\Taine\.julia\packages\ObjectOriented\MfFaY\src\runtime.jl:152
  [4] map(f::typeof(ObjectOriented.RunTime.mk_init_singleton), t::Tuple{DataType, DataType})
    @ Base .\tuple.jl:274
  [5] mk_init_singleton(t::Any)
    @ ObjectOriented.RunTime C:\Users\Taine\.julia\packages\ObjectOriented\MfFaY\src\runtime.jl:152
  [6] _construct(type_default_initializers::Type, T::Type, args::Tuple{})
    @ ObjectOriented.RunTime C:\Users\Taine\.julia\packages\ObjectOriented\MfFaY\src\runtime.jl:203
  [7] #s15#4
    @ C:\Users\Taine\.julia\packages\ObjectOriented\MfFaY\src\runtime.jl:213 [inlined]
  [8] var"#s15#4"(T::Any, ::Any, default_initializers::Any, #unused#::Any, args::Any)
    @ ObjectOriented.RunTime .\none:0
  [9] (::Core.GeneratedFunctionStub)(::Any, ::Vararg{Any})
    @ Core .\boot.jl:602
 [10] ClientConnect1()
    ...

The generated function stub is trying to analyze the field count of Ref{Bool}.