~/code/work/esp32-core/main/json/single_include/nlohmann/json.hpp: In constructor 'nlohmann::detail::input_adapter::input_adapter(IteratorType, IteratorType)':
~/code/work/esp32-core/main/json/single_include/nlohmann/json.hpp:2165:20: error: lambda-expression in unevaluated context
[&first](std::pair<bool, int> res, decltype(*first) val)
I've seen #705 but it doesn't appear to be fixed. I'm unfortunately not on bleeding edge (xtensa gcc 5.2.0) so can't use newer gcc versions where this has been fixed. Can we fix this? I can make a PR.