std::begin and std::end usage without specifying std namespace #2359

int end;
#include <nlohmann/json.hpp>
int main() { return 0; }
What is the expected behavior?
That library uses std::begin/std::end and avoids the ambiguity with other symbols from global namespace.
The issue seem to only appear in line 5094 (json.hpp, single header):
auto input_adapter(const ContainerType& container) -> decltype(input_adapter(begin(container), end(container)))
Following change seems to fix the issue:
auto input_adapter(const ContainerType& container) -> decltype(input_adapter(std::begin(container), std::end(container)))
Which compiler and operating system are you using?
Compiler: g++ (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
Operating system: Ubuntu 18.04
Which version of the library did you use?
latest release version 3.9.1