Function dispatch_iter_next

compiler/src/main/abi_bridge.rs:200–212

IterNext: pops list head; raises StopIteration when empty. */

(recv_h: u32)

/* IterNext: pops list head; raises StopIteration when empty. */
fn dispatch_iter_next(recv_h: u32) -> Result<Val, VmErr> {
    with_recv("edge_op iter_next: invalid receiver handle", recv_h, |vm, recv| {
        if let HeapObj::List(rc) = vm.heap.get(recv) {
            let mut v = rc.borrow_mut();
            if v.is_empty() {
                return Err(VmErr::Raised(s!("StopIteration")));
            }
            Ok(v.remove(0))
        } else {
            Err(VmErr::TypeMsg(s!("iter_next expects a List iterator (produced by Op::Iter), got '", str vm.type_name(recv), "'")))
        }
    })
}

fn dispatch_new_dict() -> Result<Val, VmErr> {
    in_vm("edge_op new_dict called outside run()", |vm| vm.heap.alloc(HeapObj::Dict(Rc::new(RefCell::new(DictMap::new())))))