https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69323
--- Comment #3 from Brian Davis <bd at jollyrogerlabs dot com> --- I just ran downstairs and used this to break g++ 4.9.2 running on Ubuntu 15.04 as well, using my original source file. Here's the compiler version string, and I'll attach the preprocessed file: $ g++ --version g++ (Ubuntu 4.9.2-10ubuntu13) 4.9.2