http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54922
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-10-13 20:54:14 UTC --- (In reply to comment #0) Some copy'n-paste error occurred while attempting to format the code example. The correct code under investigation was: //---------------- class nullable_int { bool init_; union { unsigned char for_value_init; int value_; }; public: constexpr nullable_int() : init_(false), for_value_init() {} }; //----------------