[Issue 23326] invariant syntax is inconsistently strict for annotations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23326

Dennis <dkorpel at live.nl> changed:

           What    |Removed                     |Added
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                 CC|                            |dkorpel at live.nl

--- Comment #1 from Dennis <dkorpel at live.nl> ---
Notably the same applies to unittest:

```
@nogc unittest {}  // fine
unittest @nogc {}  // compilation errors with -unittest
```

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