We're talking about a function which names `system.cmp[T]` as a specific default. If that doesn't exist, then the function declaration is flawed, even though you don't use the default.
I guess I'm not being clear. Please look at the following example: * [https://glot.io/snippets/f3jkvt963v](https://glot.io/snippets/f3jkvt963v)
