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Niels Lohmann
da95d1184e
CustomSentinel lives in an anonymous namespace (internal linkage), and the library's parse loop only ever evaluates the iterator-first direction (it != last), so the reversed-order friend operator!= was never referenced. Clang's -Weverything flags such unused internal declarations as an error. Drop the unused overload; the used direction is enough to satisfy can_compare_ne's either-order detection. Signed-off-by: Niels Lohmann <mail@nlohmann.me>