code: def get_derived_from(self, address):
      
      parent_address = self._derived_from_by_derivative.get(address, address)
      return self.get_target(parent_address)
docs: Get the target the specified target was derived from.
  
      If a Target was injected programmatically, e.g. from codegen, this allows us to trace its
      ancestry.  If a Target is not derived, default to returning itself.
  
      :API: public