[Issue 20945] alias x = ref y compiles

[d-bugmail at puremagic.com]

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

--- Comment #4 from Stanislav Blinov <stanislav.blinov at gmail.com> ---
...and then there's the whole old syntax of

alias static int si;
alias auto int au;
alias scope int sc;
alias override int ov;
alias abstract int ab;
alias synchronized int sy;
alias nothrow int nt;
alias pure int pu;
alias ref int re;
alias __gshared int gs;

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