Code with undefined behavior in C#

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As others have mentioned, pretty much anything in the “unsafe” block can yield implementation-defined behaviour; abuse of unsafe blocks allows you to change the bytes of code that make up the runtime itself, and therefore all bets are off.

The division int.MinValue/-1 has an implementation-defined behaviour.

Throwing an exception and never catching it causes implementation-defined behaviour — terminate the process, start a debugger, and so on.

There are a number of other situations in C# where we are forced to emit code which has implementation-determined behaviour. For example, this situation:

https://learn.microsoft.com/en-us/archive/blogs/ericlippert/odious-ambiguous-overloads-part-two

However, the situations in which a safe, well-behaved C# program has implementation-defined behaviour should be quite rare.

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