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