Provide a tip for how to resolve `base` not being available in namespaces

[bgerm]

After migrating to M4 I received the error message provided below.

It would be helpful to add a tip for how to resolve base not being available. Maybe include some background and then a resolution: fork .base lib.base.

.exercism.track>


    ❓

    I couldn't resolve any of these symbols:

        4 | unique type Error = Error Text


    Symbol   Suggestions

    Text     No matches