id: only-strings-in-dunder-all
valid:
  - |
    __all__ = ["foo", "bar", "baz"]
  - |
    __all__ = (
        "Foo",
        "Bar",
    )
  - |
    __all__ = []  # empty is fine
invalid:
  - |
    __all__ = [foo, "bar"]
  - |
    __all__ = ["foo", bar]
  - |
    __all__ = [helper()]