code: def expand_no_defaults (property_sets):
      
      assert is_iterable_typed(property_sets, property_set.PropertySet)
      # First make all features and subfeatures explicit
      expanded_property_sets = [ps.expand_subfeatures() for ps in property_sets]
  
      # Now combine all of the expanded property_sets
      product = __x_product (expanded_property_sets)
  
      return [property_set.create(p) for p in product]
docs: Expand the given build request by combining all property_sets which don't
          specify conflicting non-free features.