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It is not a good idea to inherit from a definition which resides in the same module as the dependent one.

Module files are loaded in order of discovery, which however varies over time. This means that after one reload, a definition might work while the next time you edit the definition or restart your application, it may fail to discover an interintra-modular dependency and hence load correctly. Due to this behavior, you should not create such dependencies as they are inherently – no pun intended – unstable.