The Child class should not know or care about where Base gets its methods.

Then there is problematic behavior in Class::Trait. Not sure if this is exactly a bug or a design contention, but the following is inconsistent with your point above. Quoting the docs:

If a method label in a class conflicts with a method label in the trait (or composite trait), the class method is chosen and the trait method is discarded. This only applies to methods defined directly in the class's symbol table, methods inherited from a base class are overridden by the trait method.

Since a trait inherited from Base is not flat (mixed in) in Child, overriding behavior is different.

IMHO the default behavior for conflicts (of any sort) should be a fatal compile time error. If you don't do this you lose a significant advantage of protocols (using the more theoretic term here to distance from Java interfaces). If you think that this is wrong, at least make the behavior consistent. ("You" ne you personally, necessarily; I realize somebody else is maintaining the module now.)

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