Bamba 2

def printf: extfn -> void;

fdef main: proc -> i32 {
    printf("Hello World!");

    return i32(0);
}

def fib: proc idx[i32] -> i32 {
    if (idx < 2) {
        return idx;
    }

    return fib(idx - 1) + fib(idx - 2);
}

def mainBuilderBuilder: proc T -> class {
    return class {
        def buildMain: proc value[T] -> (fn -> T) {
            return fn -> T {
                return value;
            }
        }
    }
}

fdef main: mainBuilderBuilder(i32).buildMain(0);