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Clang warns if falling through to a case or default label that is immediately followed by break, but GCC does not (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91432). (MSVC also warns about the equivalent code in C++.) This is in preparation for enabling fallthrough warnings on Clang. Reviewed-by: Jelte Fennema-Nio <postgres@jeltef.nl> Discussion: https://www.postgresql.org/message-id/flat/76a8efcd-925a-4eaf-bdd1-d972cd1a32ff%40eisentraut.org