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0aaa6b1a08
Unfortunately, fmt v10 dropped support for operator<< formatters, forcing us to replace the huge number of operator<< implementations in our code by uglier and templated fmt::formatter implementations to get Scylla to compile on modern distros (such as Fedora 39) :-( Kefu has already started doing this migration, here is my small contribution - the formatter for mutation_fragment_v2::kind. This patch is need to compile, for example, build/dev/mutation/mutation_fragment_stream_validator.o. I can't remove the old operator<< because it's still used by the implementation of other operator<< functions. We can remove all of them when we're done with this coversion. In the meantime, I replaced the original implementation of operator<< by a trivial implementation just passing the work to the new fmt::print support. Refs #13245 Signed-off-by: Nadav Har'El <nyh@scylladb.com> Closes scylladb/scylladb#17432