[issue39689] test_struct failure on s390x Fedora Clang buildbot

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

fwiw oss-fuzz also finds this on struct (via ubsan)

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20949

struct.unpack('?', ' ')

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