[mypyc] Fix cross-group call to inherited __mypyc_defaults_setup#21481

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VaggelisD:upstream-fix-cross-group-defaults-setup-call

Commits on May 13, 2026

Fix cross-group call to inherited __mypyc_defaults_setup

georgesittas
and
claude
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Add regression test for cross-group defaults setup call

georgesittas
and
claude
committed