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warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error
@hmwillson

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@hmwillson

Bug report

Bug description:

fromwarningsimportdeprecatedfromtypingimportProtocolclassFooProtocol(Protocol):passclassBase:pass@deprecated("")classDeprecatedBase:passclassFooWithBase(Base,FooProtocol):passclassFooWithDeprecatedBase(DeprecatedBase,FooProtocol):passassertFooWithBase._is_protocolisFalseassertFooWithDeprecatedBase._is_protocolisTrue

CPython versions tested on:

3.13

Operating systems tested on:

macOS

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    stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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