I perhaps should have pointed out that in general, you don't want to use parent's -norequire option.
-norequire is a hint to parent that it shouldn't try to load the file which the base class lives in. In my example, both classes were in the same file, so trying to load a separate file for the base class would not lead to success. Once you've split the parent into its own file, you should do something like:
use parent "ParentClass";
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