[Issue 17934] [scope] scopeness entrypoint for unique/ref-counted missing

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17934

--- Comment #12 from Nick Treleaven <nick at geany.org> ---
If you define `front` as `return`, *not* `return scope`:

    Elem front() @safe return

You get an error for:

    elem = l.front;

I think that fixes this issue, though that feature may need documenting.

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