Docs for `Group` type

[Bahman Movaqar via Digitalmars-d-learn]

On 07/12/2016 01:01 PM, Mike Parker wrote:
> Do you have some sample code that shows the error?

Yes.  I'm working on Stockman[1] a playground to learn D.
In file `etl.d`, line 110 [2], if I change the line to
    auto refInvoice = group[1].takeOne();
the file will not compile.  I have attached the compile error to this
message.

Thanks,
-- 
Bahman


[1] https://github.com/bahmanm/stockman-d
[2] https://github.com/bahmanm/stockman-d/blob/master/source/etl.d#L110
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