+ permerror (input_location, "ISO C++11 only allows pointer " + "conversions for integer literals");
FWIW, I think it would be clearer to either mention the currently selected language version or leave it out completely rather than hardcoding C++11. When the user specifies -std=c++14 (or later), or when that's the current version used by the compiler, a warning that tells them what C++ 11 allows isn't really relevant (or meaningful), and becomes less so as time goes on. Martin
