Lox implementation in Rust

An implementation of Lox (for now only the interpreter, I will add the compiler later) in Rust. Since it's my very first interpreter, the logic follows closely the jlox implementation from the book Crafting interpreters. However, I tried to write it in a more idiomatic Rust (e.g. using pattern matching instead of visitor pattern).

Example

class Person {
    init(name) {
        this.name = name;
    }

    hi() {
        print "Hi, I'm " + this.name + ".";
    }
}

class Employee < Person {
    init(name, profession) {
        super.init(name);
        this.profession = profession;
    }

    hi() {
        super.hi();
        print "I'm a " + this.profession + ".";
    }
}

var alice = Employee("Alice", "Software Engineer");
alice.hi();


fun fib(n) {
    if (n <= 1) {
        return 1;
    } else {
        return fib(n - 1) + fib(n - 2);
    }
}

for (var i = 0; i < 10; i = i + 1) {
    print fib(i);
}