After I rewrote passing the environment through copying, that continued bugging me since copying is expensive. It also dawned to me where I made the mistake; I copied a local reference, modified that, and never passed it back before.
I rewrote the compiler such that the environment is passed as a pointer. It makes more sense and a lot of passes will use the environment, I didn't like the idea of spurious copying.
I also noticed again how computationally expensive the identification phase is, but I am not going to change that. It's just one pass and can hopefully easily be rewritten at a later stage.
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