Interpolation struct names and location

[Atila Neves]

On Wednesday, 14 February 2024 at 12:59:34 UTC, Paul Backus wrote:
> On Wednesday, 14 February 2024 at 05:30:47 UTC, Steven 
> Schveighoffer wrote:
>> [...]
>
> I think putting them in `core.interpolation` instead of 
> `object.d` is fine. Having to `import core.interpolation` when 
> you write a function that takes an interpolation sequence is no 
> worse than having to `import core.vararg` when you write a 
> variadic function.
>
> Normally, my suggestion would be to not repeat the module name 
> in the type name, and just call these 
> `core.interpolation.Header`, `core.interpolation.Footer`, 
> `core.interpolation.Literal`, and 
> `core.interpolation.Expression`. However, the names of these 
> types are going to show up in user-facing error messages 
> without the module name attached, so having some kind of prefix 
> to distinguish them makes sense.

This can be fixed by using the fully qualified name.