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```val foos = extensions.create&lt;Foo&gt;("foo")
foos.s.register("a")```
```val a: NamedDomainObjectProvider&lt;S&gt; = foo.s.a```

Yeah, it's weird. `Foo.s` is a property, but `s` needs to be an extension on Foo.

try this

```abstract class Foo : ExtensionAware {
  val s: NamedDomainObjectContainer<S> = extensions.create("s")
}```

this code results into
```Could not create an instance of type app.softwork.kobol.gradle.Foo.
      > Could not create an instance of type org.gradle.api.NamedDomainObjectContainer.
         > Could not generate a decorated class for type NamedDomainObjectContainer.
            > Cannot have abstract method NamedDomainObjectCollection.getAsMap().```
same error when using: `interface Foo: NamedDomainObjectContainer<S>`

But this code works:
```abstract class Foo : ExtensionAware {
    abstract val s: NamedDomainObjectContainer&lt;S&gt;

    init {
        extensions.add("s", s)
    }
}```

And I found a PR which generates nested accessors: <https://github.com/gradle/gradle/pull/23665>