[External] : Re: provides and requires static ... runtime error

[Ron Pressler]

> On 24 Apr 2023, at 10:31, Rob Bygrave <robin.bygrave at gmail.com> wrote:
> 
> > uses x.Plugin
> 
> No it won't.
> 
> The uses x.Plugin is in x. So the application does not have the uses clause.
> 
> Hence the problem hete that it does not 'just work'.
> 

I’m confused. To use the implementation of the `x.Plugin` service (defined in X) that you want Y to `provides` an implementation of, some module *must* have a `uses x.Plugin`. The runtime has to know that that service is needed by the program. Maybe the application `uses` it, but X itself could also declare that it `uses` an implementation of a service interface that it, itself, declares. So perhaps it is X that `uses X.plugin`, but someone has to actually say they want to use the service.

— Ron