const reference on temporary returned by boost::filesystem::path::operator/ is broken

[MarcoWagner]

After upgrading from boost 1.69 to boost 1.70 holding a const reference from a temporary returned by boost::filesystem::path::operator/ is broken.

boost-Version: 1.70.0
Platform: Windows 10 / Version 1803 (Build 17134.765)
Compiler: Visual Studio 2017 (cl.exe, 19.16.27030.1; link.exe, 14.16.27030)

main.cpp.txt
CMakeLists.txt