const auto c=""~'"';const char*x="pragma(msg,`const auto c=`,c,c,`~'`,c,`';const char*x=`,c,x,c,`;`,x);";pragma(msg,`const auto c=`,c,c,`~'`,c,`';const char*x=`,c,x,c,`;`,x);
Note that non-ascii characters in the above source code will be escaped (such as \x9f).