Dear all, Looking into gcc/cp/Changelog, it appears that on 2015-08-06 support for the C++ Concepts TS was added to trunk. Have Concepts in gcc matured to the point that end-users can start to explore and test them? If so, the page https://gcc.gnu.org/projects/cxx1y.html needs an update, since it mentions the c++1z Concepts Lite *branch* at the end of the document. There is also no explanation how to enable experimental c++1z features that I can see on that page (like there is for c++14 at the top of the page). I suppose a new section on 'C++1z language features' is due? Thank you in advance for the clarification. With kind regards, jan van Dijk.