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I came across Arret while experimenting with Tree-Sitter, and I really like the choices you've made in designing Arret.

What are Arret's capabilities in regards to binding to other Rust/C library interfaces? How much work is involved in putting together a web server example?

Cheers.

--- edit ---

I just realized I missed a large part of the documentation regarding RFI in the runtime.
https://rustdoc.arret-lang.org/arret_runtime/index.html

So, it looks like it would be possible I can definitely do more research from here, though.

This intuitively correct code does not compile:

(defn generic-typing #{[T Num]} ([input T]) -> T
  (if (float? input)
    (ann input Float)
    (ann input Int)))

Within our current type inference architecture we have two options:

1. Ignore occurrence typing and leave input as T in both branches. This is the current behaviour and allows input to still satisfy T.
2. Override input's type to Float/Int in the branches. This means input no longer satisfies T because we "forget" that it used to be a T.

The fundamental problem is we have no way of internally representing constrained versions of polymorphic types

There was an attempt to work around this by updating T's bound in the branches. This allows the above example to compile. However, this is incorrect if multiple variables have type T:

(defn generic-typing #{[T Num]} ([first T] [second T]) -> T
  (if (float? first)
    (ann second Float) ; <-- WRONG
    (ann second Int)))