[3.9] bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)#30568

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miss-islington merged 1 commit intopython:3.9from

miss-islington:backport-1de6015-3.9

Jan 13, 2022

Commits on Jan 12, 2022

bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)

sobolevn
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miss-islington
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