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

[rikki cattermole]

- In the first alternative a disadvantage is listed but no advantages. 
An advantage of it is that there would be no breaking changes unlike the 
proposed solution which has an unknown amount of breakage.

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.

- What is the interaction with indexes? No mention of them, nor example.

- The examples you have may look good for an implementer, but for 
everybody else perhaps some examples using concrete types that ignore 
the foreach body would be a good edition. Just to make it clear what 
we're getting out of it. I.e.

RangeWithoutRefFront expr; // T front()

foreach(v; expr) // ok
foreach(ref v; expr) // Success but will be error after deprecation
foreach(auto ref v; expr) // ok