def __add__()

in usort/types.py [0:0]


    def __add__(self, other: "SortableImportItem") -> "SortableImportItem":
        if not isinstance(other, SortableImportItem):
            return NotImplemented

        if self.name != other.name and self.asname != other.asname:
            raise ValueError("name and asname must match")

        return SortableImportItem(
            name=self.name,
            asname=self.asname,
            comments=self.comments + other.comments,
            stem=self.stem,
        )