[bowero]

The chance of this accidentally happening is almost 0. This is what `gcc` does:

`test.c:6:31: warning: trigraph ??/ ignored, use -trigraphs to enable [-Wtrigraphs]`

[threatripper]

So it would take some clueless developer who adds the compiler flags to get rid of the warnings during the yearly code cleanup season.

Therefore the probability of this happening by accident is 0 but the probability of this happening by incompetence (after the trigraph already slipped in undetected) hovers around 82%.

[bowero]

Sadly, you might have a very good point here.