fix ref counting

[nbittich]

this should work:

store = struct  {todos: [struct {value:"do some work"}]}


for t in &store{
    println(t)
}

this also should work:

store = struct  {todos: [struct {value:"do some work"}]}


for t in &store{
     t.checked=true
}

this too:

store = struct  {todos: [struct {value:"do some work"}]}
x = &store

for t in x{
     t.checked=true
}