I added a “loud” but seemingly innocuous print statement to debug a C++ program:
cout << "WAITING!?!?!?!??!" << endl;
On compilation, I got:
$ g++ -Wall -c -o main.o main.cc In file included from main.lzz:12, from main.cc:4: /opt/armed/include/commons/st/st.h:229:35: warning: trigraph ??! ignored, use -trigraphs to enable
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