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Build fails: error: static_assert failed "could not find from_json() method in T's namespace" #54

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@yurivict

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@yurivict

See the log here: http://beefy12.nyi.freebsd.org/data/head-amd64-default/p493484_s344398/logs/magnum-plugins-2019.01.log (IPv6 URL)

/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/./json.hpp:1378:9: error: static_assert failed "could not find from_json() method in T's namespace"
        static_assert(sizeof(BasicJsonType) == 0,
        ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~
/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/./json.hpp:1387:16: note: in instantiation of function template specialization 'nlohmann::detail::from_json_fn::call<nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer>, std::__1::basic_string_view<char, std::__1::char_traits<char> > >' requested here
        return call(j, val, priority_tag<1> {});
               ^
/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/./json.hpp:6861:9: note: in instantiation of function template specialization 'nlohmann::detail::from_json_fn::operator()<nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer>, std::__1::basic_string_view<char, std::__1::char_traits<char> > >' requested here
        ::nlohmann::from_json(std::forward<BasicJsonType>(j), val);
        ^
/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/./json.hpp:9578:36: note: in instantiation of function template specialization 'nlohmann::adl_serializer<std::__1::basic_string_view<char, std::__1::char_traits<char> >, void>::from_json<const nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer> &, std::__1::basic_string_view<char, std::__1::char_traits<char> > >' requested here
        JSONSerializer<ValueType>::from_json(*this, ret);
                                   ^
/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/./json.hpp:9841:16: note: in instantiation of function template specialization 'nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer>::get<std::__1::basic_string_view<char, std::__1::char_traits<char> >, std::__1::basic_string_view<char, std::__1::char_traits<char> >, 0>' requested here
        return get<ValueType>();
               ^
/usr/include/c++/v1/string:875:29: note: in instantiation of function template specialization 'nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer>::operator basic_string_view<std::__1::basic_string_view<char, std::__1::char_traits<char> >, 0>' requested here
        {__self_view __sv = __t; return assign(__sv);}
                            ^
/wrkdirs/usr/ports/graphics/magnum-plugins/work/magnum-plugins-2019.01/src/MagnumExternal/TinyGltf/tiny_gltf.h:1924:12: note: in instantiation of function template specialization 'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator=<nlohmann::basic_json<std::map, std::vector, std::__1::basic_string<char>, bool, long, unsigned long, double, std::allocator, adl_serializer>, void>' requested here
    (*ret) = it.value();

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