Is the Lox language eligible?

[goncalorazevedo]

Hi 👋
I was reading the guidelines and it says in this section that hobby languages are not allowed, I was wondering if Lox still falls under this category, given its popularity in pedagogical contexts.

For context, it's the language built in the book Crafting Interpreters from Robert Nystrom and usually used with .lox file extension. I am willing to open a PR if the language is eligible.

Below is a snippet of an example that I find very curious:

// lox language from the book crafting interpreters
// here abusing closures to achieve a memoized fib implementation

fun empty_cache(n) {
    return nil;
}

fun extend(cache, key, value) {
    fun lookup(n) {
        if (n == key) return value;
        return cache(n);
    }
    return lookup;
}

fun make_fib() {
    var cache = empty_cache;

    fun fib(n) {
        var cached = cache(n);
        if (cached != nil) {
            return cached;
        }

        var result;
        if (n < 2) {
            result = n;
        } else {
            result = fib(n - 1) + fib(n - 2);
        }

        cache = extend(cache, n, result);
        return result;
    }
    return fib;
}

var fib = make_fib();
print fib(100);