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Wait for all superclass method groups before processing subclasses - #22113
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ilevkivskyi merged 1 commit intoOct 5, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code: scipy-stubs (https://github.com/scipy/scipy-stubs)
+ tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
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A nested class can split its enclosing class's methods into several groups. Processing the first group currently unblocks subclasses while later base-class methods are still waiting, which can make mypy miss incompatible assignments to inherited attributes.
Count the remaining groups for each class and only unblock subclasses after the last group has been processed. This fixes the existing ordering bug discussed in #22111 separately from that PR's performance change.