Could anyone create a short sample that breaks, unless the [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] is applied?
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
CER attributes are means of documentation. They do influence how CLR will execute code in some situations, but I believe they (or lack of them) will never result in error in current versions of .NET.
They are mostly 'reserved for future use'.