[Issue 13361] Empty UDA accepted

[via Digitalmars-d-bugs]

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

--- Comment #1 from Kenji Hara <k.hara.pg at gmail.com> ---
But UDA can take zero-length tuple, which is finally reduced to @().


alias TypeTuple(T...) = T;

alias args = TypeTuple!();  // zero-length tuple

      void foo() {}
@args void bar() {}
@()   void baz() {}

pragma(msg, __traits(getAttributes, foo).length);   // prints 0
pragma(msg, __traits(getAttributes, bar).length);   // prints 0
pragma(msg, __traits(getAttributes, baz).length);   // prints 0

Yes, it is useless, but I don't think it's invalid syntax.

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