D Primary Type Syntax is Essentially Implemented!

[Nick Treleaven]

On Thursday, 21 December 2023 at 15:34:11 UTC, Nick Treleaven 
wrote:
> ```
> BasicType:
>     `(` `ref` Type `)`
> ```

Sorry, that allows invalid types. Should be:
```
BasicType:
     ( ref Type delegate Parameters MemberFunctionAttributes? )
     ( ref Type function Parameters FunctionAttributes? )
```