chunkBy bug?

[JG]

On Saturday, 5 September 2020 at 04:10:58 UTC, H. S. Teoh wrote:
> On Sat, Sep 05, 2020 at 03:30:33AM +0000, JG via Digitalmars-d 
> wrote:
>> The following code won't compile:
>> ----
>> import std.algorithm;
>> import std.range;
>> import std.stdio;
>> 
>> void main() {
>>  auto v = [2,4,8,3,6,9,1,5,7];
>>  foreach(i; 2..4) {
>>   writeln(v.myChunkBy!((a,b)=>a%i==b%i));
>>  }
>> }
>> ----
>> /opt/local/include/phobos/std/algorithm/iteration.d(2009): 
>> Error: function
>> tmp.main.ChunkByImpl!(__lambda1, 
>> int[]).ChunkByImpl.Group.popFront cannot
>> access frame of function D main
>> ----
> [...]
>
> Are you using LDC?  IIRC there was a recent bug fixed in dmd 
> that fixes this problem in some cases, but LDC still has this 
> bug.  Maybe try with dmd to see if it works?
>
>
> --T

Thanks for your reply. I was getting the same error with both dmd 
and ldc, I will try updating. For clarity do you know what 
precisely is causing the problem? My "fix" was to un-nest the 
structs used in chunkBy. Was the bug in dmd, something to do with 
nested structs?