Is it a bug?

[Jack Applegame via Digitalmars-d-learn]

On Wednesday, 25 November 2015 at 09:31:15 UTC, John Colvin wrote:
> import std.range;
> import std.algorithm;
> import std.utf;
>
> void main() {
> 	char[64] arr;
> 	copy(chain("test1", "test2").byCodeUnit, 
> arr[0..10].byCodeUnit);
> }
I'll use byCodeUnit. Thanks.