clang++-6.0 (6.0.0-svn321357-1) warning

[mgerhardy]

Getting this warning with compiling with clang++ 6.0

/home/mgerhardy/dev/engine/src/modules/core/json.hpp:6323:20: warning: result of comparison of 0 <= unsigned expression is always true [-Wtautological-unsigned-zero-compare]
        return ((0 <= u and u <= 127) ? 0
                 ~ ^  ~

[nlohmann]

This warning has been resolved some while ago, see 8af49d4be#diff-d525c458d12b63b74e3cf18acbbe25bbR6323.