"Convert to for" code fix produces invalid cast using "var"

```csharp
var items = new[] { new { x = 1 } };

foreach (var item in items)
{
}
```

Attempting to apply the "Convert to for" code fix results in:

```csharp
var items = new[] { new { x = 1 } };

for (int i = 0; i < items.Length; i++)
{
    var item = (var)items[i];
}
```

where the `(var)` cast is invalid.