Bug or "hidden" feature?

[bauss via Digitalmars-d]

If a function has an UDA you don't need to give the function a 
return type.

Is that a bug or a hidden feature?
Example:

```
import std.stdio;

struct A { }

@A test()
{
        writeln("Called test()");
}

@A test2()
{
        return true;
}

void main()
{
        test();
        writeln(test2());
}
```