I am working with a library whose setups is such:

let a = A::new();
let b = B::new(&a);
let c = C::new(&a,&b)

Now as a design decision I want to have the setup of the library away from the main function, but still access the fields till the end of main function.
Two solutions I found for this:

1. Self-referential struct with ouroboros
2. Wrapping the application with the library by sending the whole "main" to the setup process.

Both of these work, and I favor the first one, but I am wondering if there is a more idiomatic/native way of solving this issue.

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