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When converting a JSON array to std::map or std::unordered_map with a non-string key, each element must itself be a [key, value] array. If an element is not an array, from_json() threw type_error 302 with the outer array's value (&j) as the exception context, so with JSON_DIAGNOSTICS enabled the message pointed at the whole array instead of the offending element (e.g. "(/outer/m)" instead of "(/outer/m/2)"), even though the message text already described the element's type. Both from_json() overloads now pass the element (&p) as the context, so the reported JSON Pointer matches the type named in the message, the same way std::vector<std::vector<T>> and similar conversions already do. Fixes #5668. Signed-off-by: Niels Lohmann <mail@nlohmann.me>