[Issue 13361] Empty UDA accepted

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13361

--- Comment #2 from Orvid King <blah38621 at gmail.com> ---
A zero length tuple at least means something, but an explicitly empty UDA 
should be a syntax error. I believe that the only times it's possible for @() 
to actually be in the code is accidental, and so the compiler should be helpful 
in this case. @args should continue to be valid, and only @() should produce an 
error.

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