how to travel inner functions ( a type of node inside another type of node)

I would like to replace the first `n(0)` and `n(1)`, but there is another `n(0)` in the inner function where the `n` is not same with the first `n`.

So how could I diff them?

```
function a(e, t, n) {
var x = n(0); // // there is an n

function d(e) {
var n = c(e); // there is another n
return n && t && n(0);
}

var y = n(1); // this is the first n too.
}
```

No file, test, or entry point is identified. Start by examining how the project represents nested JavaScript function nodes and how traversal distinguishes bindings in the issue's example. Done means the two outer `n` references can be distinguished from the inner `n` binding, with behavior demonstrated by a focused test.

Written by the indexing model from the issue text.