[Issue 11934] Allow `ref` in `foreach` over range iff `front` returns by `ref`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11934

--- Comment #6 from Nick Treleaven <nick at geany.org> ---
(In reply to Denis Shelomovskii from comment #0)
>     static assert(!__traits(compiles, { foreach(ref n; S1()) { } })); // fails

This line still fails, so reopening. This could be fixed in the next edition.

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