Breaking D2 language/spec changes with D1 being discontinued in a month

[Andrei Alexandrescu]

On 11/28/12 8:35 AM, Walter Bright wrote:
> On 11/29/2012 12:15 AM, Jacob Carlborg wrote:
>> Many people has also talked about something in between D1 and D2, D1.5
>> or similar. Which would contain bug fixes and new backwards compilable
>> changes.
>
>
> The trouble with that is now I'd be maintaining 3 versions of the
> compiler rather than two.
>
> Here's what happens nearly all the time. People create a pull request
> for a fix to D2. I don't just pull it, I review it and see if it is a
> fix that should be propagated to D1. If it is, I have to manually merge
> it into D1 (as the sources have substantially diverged by now). This
> gets fairly time consuming. Check the D1 commits labeled along the lines
> of "merge D2 pull #nnnn".
>
> Only a relatively small handful of times has anyone submitted a
> corresponding pull request for D1.
>
> Adding a 3rd compiler to do this to is a large time sink.
>
> I can see creating a stable D2 and a forward D2 for 6 months at a time
> or so, as has been proposed here. I think that's a good idea. But only
> after D1 is no longer supported.

The problem with the above is the count of "I", which is too large. We 
need to switch from "I" to "we" so we can scale up.

Andrei