__builtin_unreachable  244 maint/gnulib/lib/verify.h # define _GL_HAS_BUILTIN_UNREACHABLE __has_builtin (__builtin_unreachable)
__builtin_unreachable  300 maint/gnulib/lib/verify.h # define assume(R) ((R) ? (void) 0 : __builtin_unreachable ())