[Issue 20945] alias x = ref y compiles

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20945

--- Comment #2 from Stanislav Blinov <stanislav.blinov at gmail.com> ---
...and that's been there since 2009

https://github.com/dlang/phobos/commit/e486c557bcb590b54bd414718c30c09fa6536e63

I'm almost tempted to make a PR that would add a "and never will" to that
comment.

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