Feral

let io = import('std/io');
let ptr = import('std/ptr');
let lang = import('std/lang');

let node_t = struct(d = 0, next = nil);
let list_t = struct(head = nil);

let add in list_t = fn(data) {
    if self.head == nil {
        let head in self = node_t(d = data);
        return;
    }
    let iter = ptr.new(self.head);
    while iter.get().next != nil {
        iter.set(iter.get().next);
    }
    let next in iter.get() = node_t(d = data);
};

let disp in list_t = fn() {
    if self.head == nil { return; }
    let iter = ptr.new(self.head);
    while iter.get() != nil {
        io.println(iter.get().d);
        iter.set(iter.get().next);
    }
};

let l = list_t();
l.add(1);
l.add(2);
l.add(3);
l.add(4);

l.disp();