Borrowed the “return expr if(cond)” syntax from ruby
Implemented Tail call optimization which optimizes away recursion on tail calls

Example:
Before:

str count(int amount) {
    return "Done!" if amount == 1;
    return count(amount - 1);
}

After:

str count(int amount) {
    int tco@argument@amount = amount;
    while (true) {
        if (tco@argument@amount == 1) return "Done !";
        tco@argument@amount = tco@argument@amount - 1;
    }
}