Past year I've implemented SModel, which is a crate implementing a procedural macro for generating hierarchical structures for use in the semantic model of language compilers.
What worries me is that in my actual project I sometimes create throwaway entities using the arena there (which is simply a vector of Rcs without auto cleanup; allocations result in Weak references). I'm not sure if this is a problem regarding memory, but the arena may indeed accumulate objects and it will never dispose them until the program stops executing.
I think there was a reason I did not use Gc, but I don't remember what exactly it was; I guess I had some serde compiler errors when using it with my parser (but what does this have to do anyway since I don't use fields in my nodes for holding semantic entities? Don't remind for sure.).
I think I also use ByAddress with the objects created in the arena
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