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gh-139905: better error msg when subclassing GenericAlias without calling __init_subclass__ #139949

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gh-139905: better error msg when subclassing GenericAlias without calling __init_subclass__ #139949

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@xuantengh xuantengh commented Oct 11, 2025 •
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@xuantengh xuantengh closed this Oct 11, 2025
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close as duplicate

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@JelleZijlstra JelleZijlstra Awaiting requested review from JelleZijlstra JelleZijlstra is a code owner

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