Heap-allocated loop index

[dtolnay]

Maybe I don't understand the full scope of what it is solving, but this generated code looks like it could be a lot simpler and faster.

{% for inner in nested %}{% for _ in inner %}{% endfor %}{% endfor %}

let mut _loop_indexes = Vec::new();
let mut _loop_cur = 0;
_loop_indexes.push(0);
_loop_cur = 0;
for inner in (&self.nested).into_iter() {
    _loop_indexes[_loop_cur] += 1;
    _loop_indexes.push(0);
    _loop_cur = 1;
    for _ in (&inner).into_iter() {
        _loop_indexes[_loop_cur] += 1;
    }
    _loop_indexes.pop();
}
_loop_indexes.pop();

How about:

for (_index, inner) in (&self.nested).into_iter().enumerate() {
    for (_index, _) in (&inner).into_iter().enumerate() {
    }
}

[djc]

Yeah, it was kind of lazy. I guess this will fix #9, too.