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Comment by weinzierl | Hacker News Reader

A fun one that'd fit list be sequence point violations like

    i = i++

Fun, sure, but also GCC and Clang will both warn with -Wall (-Wsequence-point / -Wunsequenced).

This would also be a code smell even if it was well defined.

Yes, it should be an explicit error. Not undefined.

Only in C, that one is defined in C++.

edit: I'm not sure it's even undefined in C.