CBPV type system basics and renamer #49
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Partially-addresses #9 and #41 . This produces a basic implementation of a CBPV type system with polymorphism, analogous to System F. To assist in hash consing, we use a similar DeBruijn-like system for type abstractions, but extend it to allow us to have 'denser' levels than a single variable at a time. We also provide a renamer, allowing us to 'fix' the abstractions in a way that makes type checking and other manipulations easier.
We also provide some tests to ensure the renamer works as we expect.