[Issue 5115] std.typecons.scoped problems

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5115

--- Comment #13 from Dmitry Olshansky <dmitry.olsh at gmail.com> ---
Indeed and with `scope` becoming a thing in DIP 1000 we can have our scope
storage class to have stack-allocated classes.

scope a = new Blah(...);

scope class instances are everywhere in DMD frontend now as well.
It's plain as day that our library solution had failed and is not required
anymore.

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