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Niels Lohmann
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operator>> parsed directly into its basic_json& target, so a parse error left the target holding whatever was parsed before the error instead of its previous value. With JSON_DIAGNOSTICS=1, that partial value also violated the class invariant, because the parent pointers of an array or object's elements are only set when the container is closed, which a failed parse never reaches; copying such a value then aborted in assert_invariant(). Fix it the way basic_json::parse() already handles this: parse into a temporary and move it into the target only once parsing succeeds, so the target is left unchanged if an exception is thrown. Fixes #5652. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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