DIP 1022--foreach auto ref--Community Review Round 1

[Dukc]

On Thursday, 8 August 2019 at 12:52:43 UTC, Dukc wrote:
> On Thursday, 8 August 2019 at 12:38:51 UTC, rikki cattermole 
> wrote:
>>
>> If we could get an idea of the severity (1-2 modules vs half 
>> vs almost all of Phobos) of the breakage being proposed, that 
>> would great.
>
> Remember that nothing will break before deprecation period 
> ends. If it proves to be too bad we can back up and go with 
> alternative #1 instead.
>

Just realized how stupid this would be in case of Phobos, if just 
about standard library usage will spit deprecation messages all 
over the place.

Phobos has to be migrated with a compiler fork that has this 
feature implemented (running it against the standard test suite 
should reveal a good enough portion of offending loops), and if 
it proves to be too bad to migrate them behind the scenes, then a 
preview switch.

Sounds unlikely to me that a switch would be needed, since it's 
just about changing `ref`s to `auto ref`s. So probably not worth 
it to add anything extra mentions of that to the DIP. But the 
main contributors are better at estimating that than me -any 
opinions?