_path="foo.py")
>>> two = ReuseInfo(copyright_notices={CopyrightNotice("John Doe")},
...           source_path="bar.py")
>>> result = one.union(two)
>>> print([notice.name for notice in sorted(result.copyright_notices)])
['Jane Doe', 'John Doe']
>>> print(result.source_path)
foo.py
c