iterate over a directory, dealing with permission errors

[xray]

On Sunday, 23 May 2021 at 15:13:31 UTC, Mike Parker wrote:
> On Sunday, 23 May 2021 at 15:12:22 UTC, Mike Parker wrote:
>
>> Are you calling it with `RangePrimitive.pop` or 
>> `RangePrimitive.popFront`?
>
> I meant, `RangePrimitive.front` or `RangePrimitive.popFront`.

RangePrimitive.popFront

In SpanMode.depth  I still get the FileException and in 
SpanMode.breadth, the program hangs for ever.