"g++-6"   -fvisibility-inlines-hidden -std=gnu++11 -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden  -DBOOST_ALL_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_CONTAINER_DYN_LINK=1 -DBOOST_CONTAINER_NO_LIB=1 -DBOOST_TEST_DYN_LINK=1 -DBOOST_TEST_NO_AUTO_LINK=1   -I".." -I"/var/boost/run/boost_root/libs/assert/include" -I"/var/boost/run/boost_root/libs/bind/include" -I"/var/boost/run/boost_root/libs/container/include" -I"/var/boost/run/boost_root/libs/container_hash/include" -I"/var/boost/run/boost_root/libs/core/include" -I"/var/boost/run/boost_root/libs/describe/include" -I"/var/boost/run/boost_root/libs/detail/include" -I"/var/boost/run/boost_root/libs/function/include" -I"/var/boost/run/boost_root/libs/function_types/include" -I"/var/boost/run/boost_root/libs/fusion/include" -I"/var/boost/run/boost_root/libs/heap/include" -I"/var/boost/run/boost_root/libs/intrusive/include" -I"/var/boost/run/boost_root/libs/iterator/include" -I"/var/boost/run/boost_root/libs/move/include" -I"/var/boost/run/boost_root/libs/mp11/include" -I"/var/boost/run/boost_root/libs/optional/include" -I"/var/boost/run/boost_root/libs/parameter/include" -I"/var/boost/run/boost_root/libs/smart_ptr/include" -I"/var/boost/run/boost_root/libs/throw_exception/include" -I"/var/boost/run/boost_root/libs/tuple/include" -I"/var/boost/run/boost_root/libs/type_traits/include"  -c -o "/var/boost/run/results/boost/bin.v2/libs/heap/test/pairing_heap_tests.test/gcc-6~gnu11/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/pairing_heap_tests.o" "../libs/heap/test/pairing_heap_tests.cpp"

In file included from ../libs/heap/test/pairing_heap_tests.cpp:14:0:
../libs/heap/test/common_heap_tests.hpp:51:15: error: 'get_rng' function uses 'auto' type specifier without trailing return type
 auto& get_rng()
               ^
../libs/heap/test/common_heap_tests.hpp:51:15: note: deduced return type only available with -std=c++14 or -std=gnu++14