How to deal with recursive type dependencies in immutable structs?

New to Julia
2

Here is the relevant issue: handle mutually-circular type declarations · Issue #269 · JuliaLang/julia · GitHub
Bottom line is that it is not resolved yet. The “accepted” solution is to use type-parameters (I think) https://github.com/JuliaLang/julia/issues/269#issuecomment-68421745

I haven’t come across your trick with try yet. It sure seems to work, the top example from 269 is:

julia> try 
           struct Foo
           a::Bar
           Foo() = new()
           Foo(a) = new(a)
       end
       catch
       end
       
    struct Bar
           b::Foo
           Bar() = new()
           Bar(b) = new(b)
    end

julia> struct Foo
           a::Bar
           Foo() = new()
           Foo(a) = new(a)
       end

julia> Foo(Bar(Foo()))
Foo(Bar(Foo(#undef)))
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