[Issue 13361] Empty UDA accepted

[via Digitalmars-d-bugs]

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

--- Comment #3 from Kenji Hara <k.hara...@gmail.com> ---
OK, I confirmed that current grammar does not allow empty argument list.

http://dlang.org/attribute.html#UserDefinedAttribute

UserDefinedAttribute:
    @ ( ArgumentList )     // <--
    @ Identifier
    @ Identifier ( ArgumentList_opt )

ArgumentList is not optional, it should have one or more arguments.

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